Instr. Oil Pump 10/28/98

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S&S Cycle, Inc.14025 County Hwy. G P.O. Box 215

Viola, Wisconsin 54664Phone 608-627-1497 Fax 608-627-1488

email sstech@mwt. netTechnical Service

Instruction sheet No. 6250Revised 10-28-98

Copyright ©, 1986, 1995, 1996, 1998 by S&S Cycle, Inc.

All rights reserved. Printed in the U.S.A.

Installation Instructions for All S&S Big Twin Oil Pump Kits

IMPORTANT NOTICE:Statements in this instruction sheet preceded by the followingwords are of special significance:

WARNINGMeans there is the possibility of injury to yourself orothers.

CAUTIONMeans there is the possibility of damage to the oil pumpor motorcycle.

NOTEOther information of particular importance has been placedin italic type.

S&S recommends you take special notice of these

WARRANTY:All S&S parts are guaranteed to the original purchaser to be

free of manufacturing defects in materials and workmanship for aperiod of six (6) months from the date of purchase. Merchandisethat fails to conform to these conditions will be repaired or replacedat S&S’s option if the parts are returned to us by the purchaserwithin the 6 month warranty period or within 10 days thereafter.

In the event warranty service is required, the original purchasermust call or write S&S immediately with the problem. Someproblems can be rectified by a telephone call and need no furthercourse of action. A part that is suspect of being defective must notbe replaced by a Dealer without prior authorization from S&S. If itis deemed necessary for S&S to make an evaluation to determinewhether the part was defective, it must be packaged properly soas to not cause further damage and be returned prepaid to S&Swith a copy of the original invoice of purchase and a detailed letteroutlining the nature of the problem, how the part was used and thecircumstances at the time of failure. If after an evaluation hasbeen made by S&S and the part was found to be defective, repair,replacement or refund will be granted.

ADDITIONAL WARRANTY PROVISIONS:(1 )S&S shall have no obligation in the event an S&S part ismodified by any other person or organization.(2) S&S shall have no obligation if an S&S part becomes defectivein whole or in part as a result of improper installation, impropermaintenance, improper use, abnormal operation, or any othermisuse or mistreatment of the S&S part.(3) S&S shall not be liable for any consequential or incidentaldamages resulting from the failure of an S&S part, the breach ofany warranties,the failure to deliver, delay in delivery, delivery innon-conforming condition, or for any other breach of contract orduty between S&S and a customer.(4) S&S parts are designed exclusively for use in Harley-Davidsonmotorcycles. S&S shall have no warranty or liability obligation ifan S&S part is used in any other application.

Safe Installation and Operation Rules:Before installing your new S&S oil pump it is your

responsibility to read and follow the installation and maintenanceprocedures in these instructions and follow the basic rules belowfor your personal safety.● Gasoline is extremely flammable and explosive undercertain conditions and toxic when breathed. Do not smoke.Perform installation in a well ventilated area away from openflames or sparks.● Compressed air and particles dislodged from usingcompressed air are harmful to eyes and body. Wear protectivegoggles when using compressed air and always direct airstream away from body parts such as hands and eyes andother people near you.● Some solvents, degreasers and other chemicals are harmfulto skin, eyes and other body parts. Many items are flammableand present a fire hazard. Read manufacturer's instructionlabel for proper use. Use in well ventilated area and wearprotective clothing when using them to avoid personal injury.● If motorcycle has been running, wait until engine and exhaustpipes have cooled down to avoid getting burned beforeperforming any installation steps.● Before performing any installation steps disconnect batteryto eliminate potential sparks and inadvertent engagement ofstarter while working on electrical components.● Read instructions thoroughly and carefully so all proceduresare completely understood before performing any installationsteps. Contact S&S with any questions you may have if anysteps are unclear or any abnormalities occur during installationor operation of motorcycle with S&S oil pump on it.● Consult an appropriate authorized H-D service manual forcorrect disassembly and reassembly procedures for any partsthat need to be removed to facilitate installation.● Use good judgement when performing installation andoperating motorcycle. Good judgement begins with a clearhead. Don't let alcohol, drugs or fatigue impair your judgement.Start installation when you are fresh.● For optimum performance and safety and to minimizepotential damage to oil pump or other components, use themounting hardware that is provided and follow all installationinstructions.● Be sure all oil lines, supply and return, are routed correctlywith clamps in place and tightened. Lines must not contactexhaust pipes or other extremely hot surfaces where they couldmelt or leak and catch fire.● Motorcycle exhaust fumes are toxic and poisonous and mustnot be breathed. Run motorcycle in a well ventilated area wherefumes can dissipate.

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Picture 1 Picture 1A

IntroductionS&S manufactures oil pumps in both cast and billet aluminum.Cast oil pump kits are designed to replace stock H-D pumpson all OHV Big Twin engines from 1936 to present except TwinCam 88. Cast pumps retain stock functions such as rear andprimary chain oiling. Billet pumps have no provision for rearchain oiling.

All S&S oil pumps provide same oil volume and pressure asstock 1973 and later H-D pumps with stock gears. Installingany S&S oil pump on engine from 1936 to 1967 results in a33% increase in supplied oil volume over stock cast iron pump.An additional 25% increase can be achieved on engines from1939 to 1972 if optional S&S pinion and oil pump drive shaftdrive gears are installed.

NOTE - Except for Knuckleheads, S&S recommends use ofoptional pinion and oil pump drive shaft gears becauseincreased oil supply is usually beneficial. However, limitedrate of oil return from Knuckle top end will likely causeproblems if later drive gears are used. Even with standarddrive gears, Knuckleheads with S&S pump may requirerestriction of top end oil supply. This is discussed in moredetail under notes on page 13.

IMPORTANT NOTES● Chrome Plating - S&S does not recommend chrome platingoil pump body or cover. Proper preparation for plating requiresabrasive buffing compounds. These materials can plug criticalpassages and otherwise damage oil pump. Also, it is extremelydifficult to chrome plate an oil pump without altering criticalmachined surfaces. Chrome in these areas or on gasketsurfaces can impair pump’s performance by altering operatingtolerances. In addition, chrome may flake and break loosecausing damage to pump and engine.

● Powder Coating - In our experience, subjecting heat-treated alloys such as those used in S&S oil pumps,crankcases, cylinder heads and other parts to excessive heatcan drastically alter their hardness, strength and other criticalproperties. The degree to which these properties are altereddepends upon the temperatures reached and the durationof exposure. When powder coating or otherwise processingalloy parts, S&S exposes them to a maximum temperatureof 370°F for no longer than 20 minutes. Under nocircumstances should parts be heated past 400°F! S&S oilpump bodies and covers are also chemically treated to insureproper function. Excessive heat may alter treatmentcompounds resulting in poor pump performance andextensive engine damage due to insufficient lubrication.

#31-6006#31-6003

Picture 2

#31-6040 #31-6042 #31-6043

Billet Oil Pump Bodies

Picture 3

.080 .150

#31-6001 #31-6073 #31-6003

3CAUTION - Plating or otherwise altering S&S oil pump maycause irreversible damage and interfere with enginelubrication. Damages caused by altering S&S oil pumpwill not be covered under warranty

● There are important differences in internal machining of oilpump bodies for each kit. Before beginning installation,compare pump body you received with those in Pictures 1,1A & 2 . Pump bodies are designed for specific year groupsand must not be interchanged or installed on engines otherthan those they were designed for.● Cast pump body #31-6003 for 1970-1991 models is identicalto #31-6006 body for 1992-up models except for slightly differentmounting bolt patterns. To positively identify bolt pattern, placeknown oil pump gasket against pump body and note whetherlower bolt holes in gasket and body line up. Parts can also beidentified by measuring thickness of material between bottomright bolt hole and supply gear cavity. See Picture 3 .Measurement for 1991-earlier pattern is approximately 080”.Measurement for ‘92-up pattern is approximately .150”.● Oil pump covers for 1992-up engines are machineddifferently from covers for earlier engines. 1992-up covers haveslightly different bolt pattern, no provision for rear chain oiler,and slotted lower left bolt holes. To identify cast covers, comparecover you received to covers in Picture 4 .

1. Top oil return hole.2. Top oil supply hole.3. Oil pressure switch or gauge hole.4. Lower oil supply hole.5. Lower oil return hole.6. Rear chain oiler hose fitting.7. Rear chain oiler adjusting screw.8. Front chain oiler hole.

● Billet pump covers have essentialy the same differencesas cast covers as well as additional options for oil line fittingplacement. Billet covers #31-6044 and #31-6047 have1992-up mounting hole pattern. Billet covers #31-6041 and#31-6045 have ‘91-earlier mounting bolt pattern. SeePicture 5. Additional information regarding billet covers canbe found on pages 11 & 12.

Some oil pump kits include parts such as drive shaft gear,pinion drive gear and/or breather gear kit in addition to oilpump assembly itself. Chart 1 lists part numbers of each kit,oil pump body, pump cover, and any additional componentsincluded in kit.

NOTE - Installation of some oil pump kits may requiremodification to engine crankcases that cause metal filings to

#31-60021936 to 1991

#31-60391992 and later

Picture 5 Chart 1

Pump Kit Pump Pump Drive Shaft Pinion Shaft BreatherPart No. Body Cover Drive Gear Drive Gear Gear Kit

Part No. Part. No. Part No. Part. No. Part No.

31-6250 31-6001 31-600231-6260 31-6003 31-600231-6270 31-6073 31-600231-6262 31-6003 31-6002 33-423931-6272 31-6073 31-6002 33-423931-6263 31-6001 31-6002 33-4230 33-4237§ 33-423931-6264 31-6001 31-6002 33-4230 33-4232 33-423931-6265 31-6073 31-6002 33-4230 33-4232 33-423932-6266 31-6003 31-6002 33-4230 33-4232 33-423931-6267 31-6003 31-6002 33-4230 33-4232‡ 33-4251†31-6261 31-6006 31-603931-6269 31-6006 31-6039 33-4230 33-4232‡ 33-4251†31-6251 31-6040 31-604131-6252 31-6042 31-604131-6253 31-6043 31-604431-6254 31-6040 31-604131-6255 31-6040 31-6041 33-4230 33-4232 33-423931-6256 31-6042 31-6041 33-4230 33-4232 33-423931-6257 31-6042 31-6041 33-4230 33-4232 33-425131-6258 31-6043 31-6044 33-4230 33-4232 33-425131-6259 31-6042 31-6041 33-4239

§ Pinion shaft drive gear, part #33-4237 for 1939 to 1953 engines, iseasily distinguishable from 1954 and later gears by the inside diametersplines machined to fit early style splined pinion shafts.†

† Breather valve gear kit, part #33-4251 for 1977 and later engines, hasa different pitch diameter from 1977 and earlier gears and can beidentified by a circular groove machined in the gear face.

‡ #33-4232 pinion shaft pump drive gear is designed to fit S&S 1958and later style tapered pinion shaft and stock 1954 to 1989 styletapered pinion shaft. Engines using stock 1990 and later style straightpinion shaft must use stock pinion shaft oil pump gear.

Note: "Bold type indicates billet oil pump kits."

#31-6041#31-6044

#31-6045#31-6047

821

3

4

5

7

821

6

3

45

4be generated. It is imperative that all filings, dirt and othercontamination be removed from crankcases, oil passages, oilpump and other engine components prior to final assembly.Blow out oil passages with compressed air.

CAUTION - Metal filings, dirt and other foreign matter cancause extensive damage to oil pump and engine.

WARNING - Compressed air and particles dislodged bycompressed air are potentially harmful. Wear protectivegoggles when using compressed air and always direct airstream away from yourself and others nearby.Pump Installation

Read instructions completely and familiarize yourself withinstallation before starting procedure. A summary chart ofinstallation steps is provided to help simplify installation. AllS&S oil pump kits are listed with the specific year groupsthey fit followed by steps required for proper installation.Select Kit Part # that corresponds to kit purchased and followrequired steps.

NOTES● Perform only those steps required for oil pump kit youwill install. Installation steps vary between kits and yeargroups. S&S urges you to review installation steps for youroil pump and year group several times before beginninginstallation or performing any crankcase modifications!● Optional steps will update 1948-1962 and 1966-1972crankcases to 1973-later style oiling. Step 4 applies to all1948-1969 crankcases except 1963-1965 models. Step 5applies to 1970-1972 crankcases. Both procedures separateoil supplied to top and bottom ends to increase oil pressure

to hydraulic lifters and top end. This helps prevent hydrauliclifers from collapsing at low RPM. While these two stepsare not mandatory, S&S strongly recommends them for allengines using hydraulic lifters except 1963-1965 outside oilerPanheads. It is also suggested that optional S&S high speedoil pump drive gears be used in all 1972 and earlier enginesexcept Knuckleheads.

CAUTION - Failure to perform all required steps may resultin engine damage.

1. Disassembly and Crankcase Identification - All Years.A. Remove old oil pump and mounting studs or bolts from

crankcase.B. Identify crankcases by comparing them to those in

photo. See Picture 6 . Circle year group that matchesyour crankcases.

NOTES● Proper identification of crankcase is imperative to insurecorrect assembly.● Machining of some aftermarket crankcases may not beconsistent with that of a specific stock year group. If in doubtabout modifications required for aftermarket crankcases,contact crankcase manufacturer.● S&S crankcases require no modification for S&S oil pump.S&S 1936-1969 generator style cases are machined toaccept S&S or stock cast iron or early alloy pump. S&S 1970-later alternator style crankcases are machined for 1981-1991or 1992-up oil pumps as specified at time of order. BothS&S and stock oil pump for specific year group can beinstalled without modification.

1936 to 1947 1948 to 1952 1953 to 1964 1965 to 1969

1970 to 1972 1973 to 1981 1981 to Present

OIL PASSAGEIDENTIFICATION

1. Main oil supply

2. Excess oil and pressure

valve relief

3. Front chain oil

4. Pinion shaft oil

5. Top end oil

6. Top end and tappet block oil

7. Pressure valve relief

1 2

3

2

4

5

3

1

2

3

1

2

1

2 6

4

3

7

46

3

Picture 6

5

Chart 2

CAUTION - Improper oil pump installation due toincorrect identification of crankcase year group mayresult in engine damage.

2. Crankcase Modification - 1970-1972 Only - Plug 3⁄16"Oil Overflow Hole.A. If engine has been removed from chassis,

CAREFULLY enlarge hole in Picture 7 with .203"(13⁄64") drill. If engine has not been disassembled applygrease to bit and both ends of hole to catch chipsWrap masking tape around drill .225" from drill pointto use as depth guide. If engine is in chassis,enlarging hole may be difficult. In this case hole maybe tapped without enlarging, but extreme caution isrequired to avoid breaking tap off in hole.

NOTE - Drill bit o.d. is very close to hole size and may tend todistort hole if drill is not steadied.

CAUTION - Distorting hole may cause poor thread fit afterhole is tapped.

B. Using 1⁄4-20 tap, carefully tap hole deep enough for1⁄4-20 set screw provided with kit to rest flush with orslightly below gasket surface. Use straight edge toconfirm set screw does not protrude above gasketsurface. See Pictures 8 and 9 . If necessary, reapplygrease to both sides of hole before inserting 1⁄4-20 tap.

NOTE - Do not tap hole so deep that screw can be threadedcompletely through hole. Objective is to have screw tighten in

Kit Part No. Year Group Required Steps Optional Steps

31-6250 Fits 1936 to 1972 1,2,3,7,8,9,10 4 (1948 to 1969 only) §

31-6251 Fits 1936 to 1972 1, 2, 3, 7, 8, 9, 10 4 (1948 to 1969 only) §31-6252 Fits 1973 to 1991 1, 3, 7, 8, 9, 10

31-6253 Fits 1992 and Later ‡ 1, 7, 8, 9, 10

31-6254 Fits 1948-1953 1, 7, 8, 9, 10 4 §

31-6255 Fits 1954 to 1969 1, 7, 8, 9, 10 4 §

31-6256 Fits 1970-1977 1, 2, 3, 7, 8, 9, 10 5

31-6257 Fits 1978 to 1991 1, 3, 7, 8, 9, 10

31-6258 Fits 1992 & Later (Pre '89 shaft) 1, 7, 8, 9, 10

31-6259 Fits 1970-1972 1, 2, 3, 6, 7, 8, 9, 10 5 §

31-6260 Fits 1970 to 1991 1, 2, 3, 6, 7, 8, 9, 10 5 ( 1970 to 1972 only) §

31-6261 Fits 1992 and Later 1, 7, 8, 9, 10

31-6262 Fits 1970 to 1972 1, 2, 3, 6, 7, 8, 9, 10 5 §

31-6263 Fits 1948 to 1953 1, 7, 8, 9, 10 4 §

31-6264 Fits 1954 to 1964 1, 7, 8, 9, 10 4 §

31-6265 Fits 1965 to 1969 1, 6, 7, 8, 9, 10 4 §

31-6266 Fits 1970 to 1977 1, 2, 3, 6, 7, 8, 9, 10 5 (1970 to 1972 only) §

31-6267 Fits 1977 to 1991 1, 3, 7, 8, 9, 10

31-6269 Fits 1992 and Later‡ 1, 7, 8, 9, 10

31-6270 Fits 1965 to 1969 † 1, 6, 7, 8, 9, 10 4 §

31-6272 Fits 1965 to 1969 1, 6, 7, 8, 9, 10 4 §

Picture 7 Picture 9Picture 8

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NOTES● Objective of this modification is to alter 1948-1962 and1966-1969 crankcases to 1973-later style oiling. With thisoiling system heads and lifters get primary, unrestricted oilsupply first. Lower end main and rod bearings get secondary,low pressure oil after top end is supplied. This modificationis recommended only if hydraulic lifters are used.● 1948-1969 style S&S crankcases feature specialmachining leaving installation of plug as described in Section4-D only step required to complete modification.● 1963-1965 and other Panheads with outside oilers cannotutilize Step #4, Optional Crankcase Modification, duedifferent oil supply system.

CAUTION - If performed on “outside oiler” Panheads,modification described in Step 4 will result in oil starvationto top end and extensive engine damage.

A. Wrap masking tape around .203" (13⁄64") drill bit .850"from point to use as depth guide. Carefully drill holein Picture 11 .850" deep. See Pictures 11 and 12 .

NOTE - Drill size is very close to hole size and may tend todistort hole if drill is not steadied.




threads just as it becomes flush with or slightly below oil pumpgasket surface.

C. Install 1⁄4 -20 set screw using Loctite on threads.

3. Crankcase Modification - 1970-1980 Only - DrillPressure Valve Relief Hole.A. Install S&S Oil Pump Drill Jig, part #53-0013, or H-D

Crankcase Oil Passage Drilling Jig, part #94461-81or #94461-82, on oil pump gasket surface ofcrankcase.

B. Use .125" (1⁄8") drill bit to drill pressure relief hole intogear cavity. See Picture 10. Apply grease to bit andboth sides of case and withdraw drill frequently duringprocedure to clear chips.

CAUTION - Do not perform Step 3 on stock 1936-1969crankcases or any crankcase with angled tappet screen.Drilled passage will intersect tappet screen oil passageresulting in loss of oil pressure. Loss of oil pressure willlikely result in serious engine damage due to inadequatelubrication.

4. Optional Crankcase Modification - 1948-1962 using#31-6001 cast or #31-6040 billet pump body, or1966-1969 using #31-6001 or #31-6073 cast pumpbody - Plug and Redrill Crankshaft Feed Hole.

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B. Using 1⁄4-20 tap, carefully tap hole deeply enough for1⁄4 -20 set screw provided in kit to bottom out with screwhead .540" to .600" below gear cover gasket surface.See Pictures 13 and 14 . Remove tap periodicallyand install set screw to check depth.

NOTE - Do not tap hole deeply enough for set screw to blocktappet screen oil feed passage.This will restrict oil supply tolifters and cylinder heads.

CAUTION - Restricted oil supply may cause extensiveengine damage.

C. On 1948-1952 crankcases blow air into intersectinghole in pump gasket surface to remove chips. On1953-1969 crankcases remove oil plug and lifterscreen filter assembly and blow air into passage toremove chips. See Picture 15 .

NOTE - Before blowing chips out, set screw must be removedto allow them to escape.

WARNING - Compressed air and particles dislodged bycompressed air are potentially harmful. Wear protectivegoggles when using compressed air and always direct airstream away from yourself and others nearby.

D. Apply Loctite to threads of 1⁄4-20 set screw providedand install to depth of .540" to .600" below gear covergasket surface.

E. Install S&S Oil Pump Drill Jig, part #53-0013, oncrankcase oil pump gasket surface. See Picture 16 .

F. Wrap masking tape around .187" (3⁄16") drill bit .750 "(3⁄4") from drill point to use as depth guide. Usingtape as guide, drill hole into pump gasket surface.375" (3⁄8") deep until it breaks into passageway justtapped. (Hole to be drilled is 3⁄8" deep and drill jig is3⁄8" thick - 3⁄8" + 3⁄8" = 3⁄4"). See Picture 16.

NOTE - Do not drill hole too deep. Hole must not extend intogear cavity side of crankcases.

CAUTION - Improperly drilled oil feed hole may cause oilto bleed off into gear cavity resulting in oil pressure lossand possible engine damage.

G. Remove drill jig and blow air into passage to removechips. See Picture 17 .



5. Optional Crankcase Modification - 1970-1972 only, using#31-6003 cast pump body or #31-6042 billet pump body-Plug and Redrill Crankshaft Feed Hole

NOTE - Objective of this modification is to alter 1970-1972cases to 1973 and later style oiling. With this oiling systemlifters get primary, unrestricted oil pressure first. Lower endmain and rod bearings get secondary, lower oil pressure aftertop end is supplied. This modification is recommended only ifhydraulic lifters are used.

Picture 19


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A. Wrap masking tape around .203" (13⁄16") drill bit .375"(3⁄8") from drill point to use as depth guide. CAREFULLYenlarge hole in Picture 18. Using tape as guide, drillhole .375" (3⁄8") deep. See Pictures 18 and 19 .

NOTE - Drill bit size is very close to hole size and may tend todistort hole if drill is not steadied.


B. Using 1⁄4 -20 tap, CAREFULLY tap hole deep enoughfor 1⁄4 -20 allen head set screw supplied in kit to bottomout with screw head .125" to .150" below gear covergasket surface. See Pictures 20 and 21 . Removetap periodically and install set screw to check depth.

NOTE - Do not tap hole so deep that screw blocks tappet screenoil feed passage, inadvertently restricting oil supply to liftersand cylinder heads.

CAUTION - Restricting oil supply to cylinder heads maycause extensive engine damage.

C. Remove oil plug and lifter screen filter assembly. Blowair in top end supply hole directly below top right pumpmounting bolt hole to remove chips and ensure thatpassage is not blocked. See Picture 22.


D. Remove 1⁄4"-20 set screw, apply drop of Loctite tothreads and install to depth of .125" to .150" belowgear cover gasket surface.

E. Install S&S Oil Pump Drill Jig, part #53-0013, on gearcover gasket surface as in Picture 23.

F. Using a .125" (1⁄8") drill bit drill angle hole from passagejust plugged until it breaks through pump gasketsurface. See Pictures 23 and 24 . While drilling hole,withdraw drill frequently to clear chips.

G. Remove drill jig and blow compressed air into passageto remove chips. Note previous cautions regardingcompressed air.

6. Crankcase Modification - 1965-1969 with kits using#31-6073 body, or 1970-1972 with kits using #31-6003body - Drill Primary Chain Oil Supply Hole.

NOTE - Objective of this modification is to update early enginesto meter oil to primary chain automatically through breathergear rather than manually through metering screw device inpump body. This update requires use of 1973-later stylebreather gear such as S&S #33-4239. This gear is not includedin kits #31-6260 or #31-6270


Picture 21Picture 20

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A. Install S&S Oil Pump Drill Jig, part #53-0013, on oilpump gasket surface as in Picture 25.

B. Using .187" (3⁄16") drill bit CAREFULLY drill hole intopump gasket surface until bit breaks out in breathervalve gear cavity. See Picture 25 . If modification isdone while engine is still assembled, apply grease toboth sides of case to help catch chips.

NOTE - Drill hole slowly and carefully to avoid contactingopposite wall of cavity when drill breaks through.

CAUTION - Contacting breather cavity wall with drill maydamage machined surface.

C. Remove drill jig and clear chips away.D. Carefully debur hole in breather valve gear cavity.

7. Oil Pump Cover AssemblyCustomer must install oil line fittings in pump coverbefore installing oil pump. Section A applies to castcovers. Section B applies to billet covers.

A. Cast Cover

NOTE - Oil line fitting placement on S&S pump may differ fromstock pump. Follow S&S instructions for installation of supplyand return fittings. Prior to installation coat threads of steelfittings with anti-seize compound to prevent galling.

CAUTION - Improper installation of oil lines or fittings mayresult in parts damage not covered under warranty.

1. Oil Supply - Oil supply line fitting can be installedat either of two locations in most S&S oil pumpcovers. Hole #2 marked “S” on cast pump coveris normally used for 1991-earlier engines. SeePicture 4. Hole #4 in face of pump cover isnormally used for 1992-up engines. Holes #2 and#4 may be used interchangeably for customapplications but hole not used must be pluggedwith #31-6007 1⁄8 -27 pipe plug.Steps below are typical for year groups shown.a. 1936-1991

1. Install 90° elbow fitting #31-6008 in hole

#2 marked “S” in top of pump cover orhole #4 in face of pump cover.

2. Install hose fitting #31-6009 in elbowfitting installed in step a.

3. Install #31-6007 1⁄8 -27 pipe plug in hole#4 in face of pump cover.

b. 1992-up1. Install 90° elbow fitting #31-6008 in hole

#4 in face of pump cover.

NOTE - Elbow fitting must be installed in hole #4 with openingpointing down for use with OEM rigid oil lines.


3. Install #31-6007 1⁄8 -27 pipe plug in hole #2

2. Oil Return - Oil return line can be connected topump at either of two locations. Hole #1 (marked“R”) on top of cover is normally used for 1991-earlier engines. Hole #5 in bottom of pump coveris normally used for 1992-up engines. Returnhole not used must be plugged with #31-60071⁄8 -27 pipe plug. Steps below are typical for yeargroups shown.a 1936-1991

1. Install 90° elbow fitting #31-6008 in hole#1 in top of pump cover.


3. If applicable, install #31-6007 1⁄8 -27 pipeplug in hole #5 in bottom of pump cover.

NOTE - Earlier S&S oil pumps have only one location foroil return.

b. 1992-up1. Install 90° elbow fitting #31-6008 in hole

#5 in bottom of pump cover.Fitting should be directed toward flat,machined surface of cover for rigid OEMoil lines, otherwise position fitting for mostconvenient oil line installation.

2. If rigid OEM lines are to be used, installcompression fitting #50-8120 (H-D#63523-92A) in 90° elbow fitting.Otherwise install hose fitting #31-6009.

3. Install #31-6007 1⁄8 -27 pipe plug in hole#1 in top of pump cover.

3. Primary Chain Oil Supplya. 1936-1964

1. Install #31-6028 1⁄16 -27 pipe plug in hole#8 in top of cover.

2. Install #31-6026 adjuster screw, #31-6035brass washer, and #31-6027 lock nut intothreaded hole in side of pump body.Bottom screw two or three times to seatproperly. See Picture 31 .

Picture 25

10NOTE - Chain oiler adjusting screw has tapered end and mustbe used. Substituting standard machine screw for taperedscrew will result in large oil loss out breather.

3. Turn screw out 1⁄2 turn and tighten locknutagainst brass washer and body.

NOTE - After engine has been run for a while it may benecessary to adjust screw to achieve desired oil flow toprimary chain. Final screw setting is usually closer to fullyclosed position.

CAUTION - Overtightening screw may damage threads oradjusting screw seat in pump body.

b. 1965-1984 engines with primary chain driveand dry clutch.1. Install #31-6010 hose fitting in threaded

hole #8 on top of pump cover.2. Connect #31-6010 fitting to primary chain

oiler line after pump is installed.3. For 1965-1972 engines using #31-6001

pump body, install #31-6026 adjusterscrew, #31-6035 brass washer, and#31-6027 lock nut into threaded hole inside of pump body. See Picture 31 .Bottom screw two or three times to seatscrew. Turn screw out approximately 11⁄2turns and tighten locknut against brasswasher and oil pump body.

NOTE - Above setting should provide 1 to 1 3⁄4 oz’s/minute oil

flow to primary chain @ 2500 RPM. This can be confirmedafter engine has reached operating temperature bydisconnecting hose to primary chain, operating engine at 2500RPM and measuring oil delivered into measuring containerduring one minute.

CAUTION - Overtightening adjustment screw may damageoil pump body.

4. No adjusting screw is provided for1965-1969 engines using #31-6073pump body because primary chain oilis metered by breather gear.

NOTE - Use of #31-6073 oil pump body requires that Step #6be performed and that 1973-later style breather gear such asS&S #31-4239 be used.

c. 1984-later engines with sealed primary - Install#31-6028 1⁄16 -27 pipe plug in hole #8 on top ofpump cover.

d. All engines with primary belt drive1. Install #31-6028 1⁄16 -27 pipe plug in hole

#8 on top of pump cover.2. For 1936-1964 engines using #31-0001

pump body, loosen locknut and screwadjusting needle into side of pump bodyuntil oil supply to primary chain iscompletely shut off, then retightenlocknut. Do not overtighten locknut oradjusting screw.

NOTE - Installing machine screw #31-6029 in pump bodyinstead of adjusting screw will result in large oil losses outcrankcase breather. Tapered adjusting screw #31-6026 mustbe used for proper adjustment of oil flow to primary chain.

CAUTION - Overtightening adjustment screw may damageoil pump body.

4. Optional Rear Chain Oiler - 1936-1991 modelswith chain drivea. Perform following steps if rear chain oiler is

desired:1. Install #31-6038 hose fitting in hole #6 in

pump cover. See Picture 3 .2. Install #31-6026 adjuster screw, #31-6035

brass washer, and #31-6027 lock nut inhole #7 in pump cover.

3. Attach hose fitting to rear chain oiler hoseafter oil pump is installed.

4. Adjust screw to provide desired amountof oil to rear chain and tighten locknut.

CAUTION - Overtightening adjustment screw may damageoil pump cover.

b. Perform following steps if rear chain oiler willnot be used:

Picture 26 Picture 27

21

9

45

2 8

3

Picture 28

1

5 5 44

111. Install #31-6028 socket head pipe plug

in hole #6 in pump cover. See Picture 3 .2. Install #31-6029 cap screw and #31-6035

brass washer in hole #7 in pump cover.

B. Billet CoverS&S manufactures four different billet oil pump covers.Most obvious differences are in mounting bolt patternand oil line fitting placement.

Pump covers #31-6041 and #31-6045 utilize '91-earlierbolt pattern. #31-6041 provides top and bottom optionsfor placement of oil supply and return line fittingsas well as provision for oil pressure gauge/switchand primary oil supply fitting. S&S Custom BilletCover #31-6045 accepts bottom mount supply andreturn lines only and has no provision for primaryoiling or oil pressure monitoring. See Pictures 5,27 and 28.

CAUTION - Custom Billet Oil Pump Cover #31-6045 is notrecommended for Dynas and other models with oil tankmounted below transmission because of possibility of cavitationor “air lock.”Cavitation can prevent adequate oil circulationresulting in extensive engine damage. See page 13, section 9for additional information on preventing cavitation.

Billet pump covers #31-6044 and #31-6047 utilize‘92-up mounting bolt pattern. #31-6044 providesbottom location for placement of oil line fittings aswell as central location for ‘92-up OEM rigid returnline. “Universal” cover #31-6047 supplied with mostS&S Long Blocks ordered with billet oil pump includessame features as #31-6044 as well as provision forplacing oil line fittings in top of cover. See Pictures5, 26 and 29.

CAUTION - To avoid cavitation in ‘92-up Dynas and othermodels with oil tank mounted below transmission, oil supplyline should be installed in bottom location in all covers.

1. Oil Supply - Oil supply line fitting can be installedat any of three locations in #31-6047 billet pumpcover normally supplied with S&S Long Blocks.

See Picture 26. Supply holes not used must beplugged with #31-6007 1⁄8 -27 pipe plugs.

Pump cover #31-6041 for ‘91-earlier modelsprovides top and bottom locations for oil supplyfitting. (See Caution below.) Custom Billet cover#31-6045 for ‘91-earlier models provides onlybottom location. Cover #31-6044 for ‘92-up modelsprovides central and bottom locations for fitting.Following steps provide detailed instructions oninstalling fittings in different billet covers

CAUTION - Hole #3 in billet pump cover #31-6041 is for oilpressure switch or gauge. See Picture 27. Although oilobtained from this site may provide adequate top endlubrication for some applications (Shovel top on Panbottom), S&S recommends site be used for pressuremonitoring only as oil from hole #3 does not go throughlifter screen. Under no circumstance may oil return linebe routed to hole #3.

Steps below are typical for year groups shown.a. 1936-1991 using pump cover #31-6041

1. Install 90° elbow fitting #31-6008 in hole#2 in top of pump cover or hole #4 inbottom of cover. See Picture 27 .


3. Install 1⁄8 -27 pipe plug #31-6007 in supplyhole not used.

4. Install oil pressure switch/gauge elbow (notsupplied) or 1⁄8 -27 pipe plug #31-6007 inhole #3 in face of cover. Do not attempt touse hole #3 for oil return line.

b. 1936-1991 using Custom Billet cover#31-60451. Install 90° elbow fitting #31-6008 in hole

#4 in bottom of cover. See Picture 28.2. Install hose fitting #31-6009 in elbow

fitting installed in step a.c. 1992-up using cover #31-6044

1. Install 90° elbow fitting #31-6008 in hole#9 in face of pump cover or hole #4 inbottom of cover. See Picture 29 .


9

45

12NOTE - Elbow fitting must be installed in hole #9 with openingfacing downward and angled toward lower left corner of coverfor use with ‘92-up Dyna-type OEM oil lines.


3. Install 1/8-27 pipe plug #31-6007 in supplyhole not used.

d. 1992-up using cover #31-6047 (Supplied withmost S&S Long Blocks.)1. Install 90° elbow fitting #31-6008 in

hole #2 in top of pump cover, hole #9in face of pump cover, or hole #4 inbottom of cover.

NOTE - Elbow fitting must be installed in hole #4 with openingfacing downward and angled toward lower left corner of coverfor use with ‘92-up Dyna-type OEM oil lines.

2. Install hose fitting #31-6009 in elbow fittinginstalled in step a.

3. Install 1⁄8 -27 pipe plugs #31-6007 in supplyholes not used.

2. Oil return - Oil return line can be connected topump cover at either of two locations in oil pumpcovers #31-6041, #31-6044 and #31-6047. Holein bottom of cover is normally used for 92-upmodels utilizing OEM rigid return line. Steps beloware typical for year groups shown.a. 1936-1991 using cover #31-6041

1. Install 90° elbow fitting #31-6008 in hole#1 in top of pump cover or hole #5 inbottom of cover. See Picture 27 .

2. Install hose fitting #31-6009 in elbowfitting installed in step 1.

3. Install 1⁄8 -27 pipe plug #31-6007 in returnhole not used.

b. 1936-1991 utilizing Custom Billet cover#31-60451. Install 90° elbow fitting #31-6008 in hole

#5 in bottom of pump cover. SeePicture 28.


c. 1992-up using cover #31-60441. Install 90° elbow fitting #31-6008 in hole

#5 in bottom of cover. See Picture 29.

NOTE - Elbow fitting must be installed in bottom hole withopening facing forward toward engine for use with ‘92-up OEMrigid return line. See Picture 30.

2. Install compression fitting # 50-8120 orhose fitting #31-6009 in elbow fittinginstalled in step 1.

NOTE - Compression fitting must be used with ‘92-up OEMrigid return line.

3. Install #31-6007 1⁄8 -27 pipe plug pipe plugin return hole not used.

d. 1992-up using cover #31-60471. Install 90° elbow fitting #31-6008 in hole

in hole #1 in top of cover or hole #5 inbottom of cover.


3. Install 1⁄8 -27 pipe plug #31-6007 in returnhole not used.

3. Primary oil supply - Cover #31-6041 is only billetcover with provision for external primary chainoiling.

NOTE - S&S billet oil pumps have no provision for oilingrear chain.

a. 1936-1964 models1. Install #31-6028 1⁄16 -27 pipe plug in hole

#8 in top of cover.2. Install #31-6026 adjuster screw, #31-6035

brass washer, and #31-6027 lock nut intothreaded hole in side of pump body.Bottom screw two or three times to seatproperly. See Picture 31 .

NOTE - Chain oiler adjusting screw has tapered end and mustbe used. Substituting standard machine screw for taperedscrew will result in large oil loss out breather.

3. Turn screw out 1⁄2 turn and tighten locknutagainst brass washer and body.

NOTE - After engine has been run for a while it may benecessary to adjust screw to achieve desired oil flow to primarychain. Final screw setting is usually closer to fully closedposition.

CAUTION - Overtightening screw may damage threads oradjusting screw seat in pump body.

b.. 1965-1984 engines with primary chain driveand dry clutch1. Install #31-6010 hose fitting in threaded

hole #8 on top of pump cover.2. Connect #31-6010 fitting to primary chain

oiler line after pump is installed.3. For 1965-1972 engines using #31-6041

pump body, install #31-6026 adjusterscrew, #31-6035 brass washer, and#31-6027 lock nut into threaded hole inside of pump body. See Picture 31 .Bottom screw two or three times to seatscrew. Turn screw out approximately 11⁄2turns and tighten locknut against brasswasher and oil pump body.

NOTE - Above setting should provide 1 to 1 3⁄4 oz’s/minute oil

flow to primary chain @ 2500 RPM. This can be confirmedafter engine has reached operating temperature bydisconnecting hose to primary chain, operating engine at 2500RPM and measuring oil delivered into measuring containerduring one minute.

13CAUTION - Overtightening adjustment screw may damageoil pump body.

8. Oil Pump Installation - All Years.A. Thoroughly clean complete pump assembly with

solvent and compressed air noting previous cautions.Recoat all moving parts with clean 20W50 engine oil.


B. Install S&S oil pump, driveshaft and drive gear innormal fashion following standard H-D procedure.Use 1⁄4 -24 mounting bolts provided for 1948-1978stock crankcase installations and 1⁄4 -20 mounting boltsprovided for 1979-present stock and all S&Scrankcase installations. Use flat washers providedonly on 2

3⁄4 " bolts and lock washers only on 11⁄2" bolts.Final torque specifications of 90 to 120 in. lbs. arerecommended with paper gaskets.

NOTES -● 1⁄4 -24 mounting bolts provided with cast oil pump kits in thepast were black. Mounting bolts presently provided with allkits are plated. Visually compare threads and gently screw oilpump mounting bolts into crankcase to confirm correct thread.● S&S oil pump bodies, covers and gaskets may appear similarto other manifacturer’s parts but should not be interchangeddue possible differences in internal machining, etc.

CAUTION - Using oil pump components other than thoseprovided by pump manufacturer may impair overallfunction of pump resulting in oil leaks, insufficient oilpressure and possible engine damage.

C. Install pinion shaft oil pump drive gear, pinion gearand remaining parts in gearcase following standardH-D procedure.

9. Prevention of Air Lock“Air lock” or cavitation can occur if trapped air is not releasedfrom oil pump after installation. It can occur with new pumpas well as used pump that has been removed from engine,and interferes with oil circulation. It is owner’s responsibilityto remove trapped air prior to running engine and to confirmcorrect pump operation as explained on following page.

NOTE - Dyna Glides, late FL’s and other models with oil tankbelow transmission require precautions to prevent air enteringoil pump during oil changes if S&S Custom Billet pump cover#31-6045 is used or if top oil supply fitting location is utilized on“Universal Cover” #31-6047. If oil lines are rubber , supply linefrom tank should be clamped during oil changes on thesemodels, and clamp removed after tank has been refilled. If it isnot possible to clamp lines, oil circulation must be confirmedafter each oil change.

CAUTION - Air lock can cause extensive damage not coveredunder warranty.After pump has been installed, oil lines connected in

correct manner and oil tank filled to correct level, removeair from pump using following procedure:

A. Remove check valve cover screw #15, check valvespring #12, and check valve ball #11 from oil pumpbody. See drawing on last page. Mechanic’s magnetwill be required to remove check ball.

B. Oil from tank will usually fill exposed cavity in a fewseconds. If not, fill cavity with clean engine oil andallow to sit for 3-4 minutes.

NOTE - Do not leave motorcycle with check ball removed ascheck ball prevents oil tank from emptying into crankcase whenengine is not running.

C. Replace check valve ball, spring and screw, and startengine.

D. Confirm oil circulation with oil pressure gauge and byremoving cap from oil tank and observing oil return totank. If oil is not seen returning to tank, S&Srecommends removing return line from tank andplacing end in drain pan to confirm oil circulation.

NOTE - Engine oil circulates under pressure. Areas exposedto escaping oil should be covered with rags and engineturned off immediately after oil circulation is confirmed tominimize oil loss.

WARNING - Oil on tires or brakes can cause loss ofcontrol of motorcycle resulting in serious injury tooperator and others.

10. Initial Startup and Post-operation Checks - All Years.A. Prime pump according to procedure described in Step

9 before initial startup.B. After confirming oil circulation run engine for several

minutes and check for leaks.C. If applicable, adjust primary and rear chain oilers

as needed.

NOTES:● Low oil pressure is often blamed on oil pump when actualcause is worn bearings, bushings or other internalcomponent. A new oil pump will not repair worn parts andexcessive operating clearances. If low oil pressure existsafter new oil pump installation, check bearing clearancesand other possible causes such as installation of differentgear cover, tappet guides etc.● Increased oil volume generated by S&S pump mayoverwhelm stock scavenging system in Knucklehead topend. If oil return becomes a problem, it can be corrected bymetering oil supply to heads. Oil fitting for top end supplyline can be filled with solder and orifice drilled in solder forthis purpose. S&S has performed tests and has successfullyoperated engines (Panheads and Shovelheads as well) withmetering holes as small as .060". Some Knucklehead owners

14

have installed S&S carb main jet in cam cover top end oilsupply fitting for same purpose, and adjusted oil flow withdifferent size jets.● Paper gaskets are supplied as standard with each kit.S&S prefers paper gaskets but can provide mylar gasketsfor 1936 to 1991 engines if desired.

1. Pump body assembly

Cast, fits #31-6250 ’36 - ’72 .............................. Part #31-6001

Cast, fits #31-6270 ’65 - ’69 .............................. Part #31-6073

Cast, fits #31-6260 ’73 - ’91 .............................. Part #31-6003

Cast, fits #31-6261 ’92 - up ............................... Part #31-6006

Billet, fits #31-6251 ’36-’72,

Billet, fits #31-6254 ’48-’53,

Billet, fits #31-6255 ‘54-’69 ........... ......................Part #31-6040

Billet, fits #31-6252 ‘73-’91,

Billet, fits #31-6252 ‘70-’77,

Billet, fits #31-6257 ‘78-’91,

Billet, fits #31-6259 ‘70-’72 ................................ Part #31-6042

Billet, fits #31-6253 & #31-6258 '92-up .............. Part #31-6043

2. Idler shaft - repl. HD#26327-68 ......................... Part #31-6004

3. Seal, drive shaft - repl. HD#26227-58 ............... Part #31-6005

4. Gear, return drive - repl. HD#26315-68A ........... Part #31-6013

5. Gear, return idler - repl. HD#26317-68A ............ Part #31-6014

6. Gear, Supply drive - repl. HD#26328-74 ........... Part #31-6015

7. Gear, supply idler - repl. HD#26326-62A ........... Part #31-6016

8. Drive shaft - repl. HD#26346-70 ....................... Part #31-6011

9. Key, drive shaft - repl. HD#26348-15 ................ Part #31-6012

10. Plug, 1⁄8-27 - repl. HD#45830-48 ....................... Part #50-8331

11. Ball, check valve - repl. HD#8866 & #8873 ....... Part #50-8091

12. Spring, check valve - repl. HD#26262-80 .......... Part #31-6022

13. Valve, relief - repl. HD #26400-82 ..................... Part #31-6019

14. Spring, relief valve - repl. HD#26207-83............ Part #31-6018

15. Screw, check valve and relief valve cover - repl. HD#26263-80

......................................................................... Part #31-6021

16. O-ring - repl. HD#11105 .................................... Part #50-8008

17. Pump cover assembly

Cast, fits ’36 to ’91, repl. HD#26234-82 ............. Part #31-6002

Cast, fits ’92 and later ....................................... Part #31-6039

Billet, fits all ’36 to ’91 ........................................ Part #31-6041

Billet, fits ‘36-‘91 custom applications only ......... Part #31-6045

Billet, fits ‘92-up stock applications .................... Part #31-6044

Billet, fits ‘92-up stock and other applications .... Part #31-6047

18. Fitting, front chain hose ......................................Part #50-8116

19. Plug, pipe 1⁄16-27 ................................................ Part #50-8332

20. Elbow, supply/return - repl. HD#26338-68 ......... Part #50-8114

21. Fitting, supply/return hose - repl. HD#63533-41 Part #50-8115

22. Fitting, compression return

repl. HD#63523-92A ......................................... Part #50-8120

23. Fitting, rear chain hose ......................................Part #50-8117

24. Screw, chain oiler adjusting ............................... Part #31-6026

25. Locknut, chain oiler ........................................... Part #50-5000

26. Washer, chain adjuster - repl. HD#6156 ............ Part #50-7008

27. Plug, adjusting screw 10-32 x 1/4” .................... Part #50-0046

28. Plug, 1/4-20 ...................................................... Part #50-0069

29. Screw, mounting

1/4-24 x 1-1/2” - ’36 - 78 ................................... Part #50-0082

1/4-24 x 2-3/4” - ’36 - ’78 - repl. HD#5430W ...... Part #50-0083

1/4-20 x 1-1/2" - ’79 - up - repl. HD#2782W ...... Part #50-0080

1/4-20 x 2-3/4” - ’79 - up - repl. HD#3429 .......... Part #50-0081

30. Washer, 1/4" - repl. HD#6703 .......................... Part #50-0029

31 Washer, lock 1/4" - repl. HD#7036 ................... Part #50-7019

32. Ring, retaining - repl. HD#26348-36 .................. Part #50-8058

33. Ring, snap - repl. HD#11002 ............................. Part #50-8059

34. Gear, pump drive, 24T - repl. HD#26345-73 ..... Part #33-4230

35. Gear, pinion shaft pump drive ’39 - ’53 .............. Part #33-4237

’54-’89 - repl. HD#26349-73, #26349-73A & #26349-84

......................................................................... Part #33-4232

36. Gear, steel breather valve

’36 - ’64 std. size gear & shims repl. HD#25300-36

......................................................................... Part #33-4238

’36 - ’64 - std. size gear only ............................. Part #33-4231

’36 - ’64 - +.030" oversize gear & shims ............ Part #33-4238

’36 - ’64 - +.030" oversize gear only .................. Part #33-4235

’48 to ’77 - std. size, gear & shims - repl. HD#25313-73

......................................................................... Part #33-4234

48 to ’77 - std. size, gear only ........................... Part #33-4234

’48 to ’77 - +.030" oversize gear & shims .......... Part #33-4259

’48 to ’77 - +.030" oversize gear only ................ Part #33-4233

’77 - up std. size, gear and shims repl. HD#25313-77A

......................................................................... Part #33-4239

’77 - up std. size, gear only .............................. Part #33-4236

’77 - up +.030" oversize gear and shims ........... Part #33-4261

’77 - up +.030" oversize gear only ..................... Part #33-4248

37. Shim, steel breather

.100" ................................................................. Part #33-4200

.110", repl. HD#25320-79.................................. Part #33-4201

.120", repl. HD#25322-79 ................................. Part #33-4202

.130", repl. HD#25325-79 ................................. Part #33-4203

Replacement Parts for S&S Oil Pumps

15

30

2021

10

1719

10

23

20

21

2910

20

21

24

25

26

22

29

10

32

6

3

7

21

26

25

24

5

4

28

42

9

8

33

34

38

35

37

36

16

14

13

11

12

16

15

27

39

19

18

21

31

.140", repl. HD#25327-79 ................................. Part #33-4204

.150" ................................................................. Part #33-4205

.160" ................................................................. Part #33-4206

.170" ................................................................. Part #33-4207

Shim kit (contains 1 ea. all sizes) ...................... Part #33-4249

38. Gasket, pump body

’36 - ’91 (paper) ................................................ Part #31-6024

’92 - up (paper) ................................................. Part #31-6030

Replacement Parts for S&S Oil Pumps - continued

’36 - ’91 (mylar) ................................................. Part #31-6054

39. Gasket rebuild kit (not shown) Includes key & snap ring

’36 - ’91 (paper) ................................................ Part #31-6271

’92 - up (paper) ................................................. Part #31-6273

’36 - ’91 (mylar) ................................................. Part #31-6274

40. Master rebuild kit (not shown)

Includes gasket rebuild kit, seal, retaining ring, relief valvespring, check valve spring, check valve ball, and coverscrew o-rings.

’36 - ’91 (specify paper or mylar) ..................... Part #31-6275’92 -up (paper only) .......................................... Part #31-6278

Instr. Oil Pump 10/28/98

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Transcript of Instr. Oil Pump 10/28/98