Post on 12-Sep-2021
I ns t r u c t I o n M a n u a
l
Va lV e s e at c u t t er
NEWAY MANUFACTURING, INC. P.O. Box 188 • Corunna, Michigan 48817 USA Phone: (989) 743-3458 • Fax: (989) 743-5764 Email: info@newaymfg.com Web: www.newaymfg.com
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l�
Before using the tools,
please read this entire manual carefully.
NARROWINGCUTTER
EXPANDABLEPILOT
SOLIDPILOT
SEATCUTTER
PILOTPULLER PIN
T-HANDLEWRENCH
BRUSH FORCLEANINGBLADESERRATIONS
5/64" HEX KEY(Blade Lock)
3/32" HEX KEY(Hub Lock)
HEADSTANDS
POWERUNIT
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l �
contents
Why Proper Valve seating is Important.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Objectivesofvalveseatreconditioning InterferenceAngle
Preparation for cutting Valve seats.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
selection and use of Proper Pilot.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 SolidPilots ExpandablePilots
selection and use of Proper Valve seat cutters.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–8 AdjustmentofCarbideBlades GeneralInstructions DetailedInstructions BottomNarrowingCut TopNarrowingCut FinalSeatCut InspectingtheSeat
changing the location and/or Width of the seat.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
checking Valve seat concentricity and closure.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 ToleranceforRunout(Concentricity)
special application carbide Blades.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 RadiusBlades SteppedBlades
Power unit.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Basic Parts list.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11–12
Helpful suggestions.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13–14
troubleshooting.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l�
Why Proper Valve seating is Important
Goodvalveseatsarecriticaltomaintainingcompressionandhorsepower.Poorlyseatedvalveswillnotonlycausecompressionloss,butwillalsocompromisetheabilityoftheexhaustvalvetocoolitselfbytransferringheatthroughcontactwiththevalveseat.Further,ifvalveseatconcentricityisoutsideoftheallowablelimit,mechanicalstressesmaycausevalvefailure.Agoodvalveseat:
• Isconcentrictothecenterlineofthevalveguide(withinOEMspecs).
• Isproperlylocatedonthevalveface.
• Istheproperwidth.
• Hasasurfacetexturewhichisconducivetoefficientsealingandheattransfer.
• Hastheproperangles(contactsurfaceandreliefanglesaboveandbelowcontactsurface,alsoreferredtoasnarrowingangles).
UnlessotherwisespecifiedbytheOEM,Newayrecommendstheuseofaninterferenceangle(e.g.45°valve,46°seat).Thiswillcausemaximumpressurebetweenthevalveandseattooccurattheoutermostdiameter.
Preparation for cutting Valve seats
• Cleanthecylinderheadthoroughly,includingtheseatsandvalveguides.
• Checktheconditionofthevalveguides(refertoOEMspecsandinspectionprocedures).
• Badlywornvalveguidesmustbereplacedorreconditionedpriortovalveseatreconditioning.
EXHAUST
COMBUSTION
CHAMBER
PISTON
CUTTER
TOPNARROWING
BOTTOMNARROWING
SEAT
VALVESEAT
INTERFERENCEANGLE
VALVEFACE
BADLY WORNGUIDE AREA
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l �
selection and use of Proper Pilot
solID PIlots
• Selectapilotthesamediameterasthevalveguideinteriordiameter(ID).
• Insertthepilotintothevalveguide,twistingslightly,untilsnug.Pilotshouldershouldnottouchthevalveguide.
eXPanDaBle PIlots
•SelectapilotthesamediameterasthevalveguideID.
• Insertthepilotintovalveguidemakingsurethattheexpandingsectionofthepilot(collet)iscompletelywithinthevalveguide.The pilot will not center properly if the collet extends outside of the valve guide even slightly. The collet may also be damaged if expanded while extended outside of the guide.
• Pilotshouldershouldbeabout1/8"(3mm)abovethevalveguide.
• Usingthepilotpullerpin,turnthepilotasthenutisheldfastattheopposingend.Thiswillexpandthecolletandsecurethepilotintoposition.
• Colletsare.003"smallerthanstateddiameterandcanexpandupto.020"(0,5mm).
• Theconcentricityofthevalveseatreliesonatightfittingpilotinaround,straight,guide.
SHOULDERSHOULDNOTTOUCH
VALVEGUIDE
PILOT
PILOT PULLER PIN
SHOULDER
EXPANDABLE PILOT
HOLE FORPILOTPULLERPIN
NUT
COLLET
1/8" (3 mm)
EXPAND PILOTBY TURNINGPILOT
PULLERPIN
NUT
COLLET
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l�
selection and use of Proper Valve seat cutters
aDJustMent of carBIDe BlaDes
• Beforeusingcutters,checkbladeadjustment.Itisnotnecessarythatallthebladesbesettothesameposition.Simplycheckthatthebladesdonotcutorgougethecombustionchamberwallandthateachbladeextendsentirelyoverthesurfacetobemachined.Donotovertightenscrews.
• Whenadjustingbladesinwardoroutwardbesurethattheblademaintainsfullcontactwiththeflatofthewedge.
• Whenchangingblades,besurethatthepointedendofthebladepointstowardthecenter,orhub,ofcutter.
General InstructIons
• Selectacutterapproximatelythesamesizeasthevalveheaddiameterandwiththecorrectangle.
• Placethecutteroverthepilotandcarefullylowerthecutterontotheseat.DONOTDROPTHECUTTER.
• PlaceT-handle,easy-turnwrench,orhexsocketofpowerunitoverthepilotandontothehexofthecutter.
• Turnclockwise,applyinglightdownwardpressure.UsetwohandsontheT-wrench.Releasethedownwardpressureattheendofeachcut.Makeoneortwoturnswithnopressure.
• Besuretomaintaindownwardpressureoverthecenterlineofthepilot.Payspecialattentiontomaintainingcenterlinepressureinsituationswherethecutteriscuttingononlyonesideoftheseat(e.g.afterinstallationofanewvalveguide).Excessivedownwardpressuremaycausethepilottoflexoffcenter.Letthecutterfollowthepilot.
HEADDIAMETER
MOST BLADES ARE ADJUSTABLE
HEX KEY
BLADE POINTED END
FLAT HEADSCREW
ALWAYS TURNCLOCKWISE
APPLYVERYLIGHTPRESSURE
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l �
DetaIleD cuttInG InstructIons
• Inspecttheseat.Thesizeofthepits,burnsouts,andblowbyeswilldeterminetheamountofmaterialthatmustberemoved.
Bottom Narrowing Cut
• Begintheprocessbycuttingthebottomnarrowingangle(usually60°or75°)usinglightpressure.Cutuntilsomeamountofsurfacehasbeencutallthewayaround,formingacontinuouslinewiththevalveseat.Thisoperationraisesthebottomedgeofthevalveseat.
• Note:Somenarrowingcuttershavemoveablehubsandwillrequireadjustment.Thesehubsareheldinpositionbyasetscrew.Donotovertightenthissetscrew.
Top Narrowing Cut
• Repeatasaboveusingthetopnarrowingangle(usually30°or15°).Again,cutuntilsomeamountofsurfacehasbeencutallthewayaround.Thisoperationlowersthetopedgeoftheseat.
Final Seat Cut
• Beforemakingthefinalcut,makesurethatthewidthoftheseat(i.e.theuncutsurfacebetweenthetopandbottomnarrowingangles),isslightlylessthandesiredfinishedwidth.Also,thisuncutsurfaceshouldappearuniforminwidthbeforemakingthefinalcut.Ifthewidthoftheuncutsurfacevariessignificantlyfromonesidetotheother,continuecuttingboththetopandbottomnarrowinganglesuntilthewidthisuniform.
selection and use of Proper Valve seat cutters (continued)
BOTTOMNARROWING
SEAT
BOTTOMNARROWINGCUTTER
TOPNARROWING
TOPNARROWINGCUTTER
SEAT
BOTTOMNARROWING
SEAT
TOPNARROWING
SEAT CUTTER
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l�
DetaIleD cuttInG InstructIons (continued)
• Cuttheseattotheproperwidth.Letthecuttermakeafewturnswithnopressure.
• Thefinishedvalveseatwillhaveamachinetexturedfinish(nothighlypolishedorshiny).Thisprovidesasoftsurfaceforfinalmatingwiththevalvefaceinthefirstsecondsofengineoperation.Itisnotnecessarytolapthevalve.
Inspecting the Seat
• Removethepilot,usingthepilotpullerpin.
• Insertthevalveintothevalveguide.
• Usingyourfingers,tapthevalvefirmlyagainstthevalveseat,upanddowninthevalveguide,holdingthevalveaboveandbelowthecylinderhead.Dothisuntilaringmarkappearsonthefaceofthevalve.
• Thevalveseatshouldbelocatedinthemiddleofthefaceofthevalve,orjustslightlyoff-centertowardthemargin.Whenthevalveseatisproperlylocatedonthevalveface(inthemiddle),theringmarkshouldappearabout1/4to1/3ofthewaydownthevalvefacefromthemargin.Thisringmarkiscreatedbytheridgeattheouterdiameterofthe46°surface,wherethe46°and31°anglesmeet.Whena1°interferenceangleexistsbetweenthevalvefaceandthevalveseat,the46°seatdoesnotmakefullcontactwithvalve.Whentheenginefirstfiresthesesurfaceswillmatetogetherandfullcontactwilloccur.Whencuttinganon-interferenceseat—45°valveto45°seat—thefullwidthofthevalveseatwillcontactthevalveaftercutting.InthiscaseitmaybeusefultousePrussianblue,orasimilarmachinist’slayoutfluid,tovisuallycheckthelocationoftheseatonthefaceofthevalve.
selection and use of Proper Valve seat cutters (continued)
LIFT WITH PILOT PULLER PIN
PILOT
VALVEGUIDE
RING-MARK
TAP UP AND DOWNONTO SEAT BY HAND
VALVE FACEVALVESEAT
MARGIN
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l �
changing the location and/or Width of the seat
Iftheringmarkistoohighonthevalveface(i.e.tooclosetothemargin),thencutmorewiththetopnarrowingangle.Thiswilllowertheringmarkonthefaceofthevalve.However,itwillalsoreducethewidthoftheseat.Itmaybenecessarytocutthe46°surfaceagaintorestoredesiredseatwidth.Similarlyiftheringmarkistoolowonthevalveface,properseatlocationcanberestoredbyeithercuttingabitmorewiththe46°cutteror,ifseatingsurfacebecomestoowide,bycuttingwithboththebottomnarrowingangle(usually60°)andthe46°angletoobtainproperseatwidthandlocation.
checking Valve seat concentricity and closure
Valveclosurereliesonboththeconcentricityofthevalveitselfandtheconcentricitybetweenthevalveguideandthevalveseatingsurface.Measuringtheamountofconcentricity,orrunout,foreachoftheseandaddingthemtogetherprovidesuswiththetotalamountofrunout.Itisthistotalrunoutwhichwilldeterminehowperfectly,orimperfectly,thevalveseats.Therewillalmostalwaysbesomeamountofrunout,itisthereforeimportanttounderstandtheallowablelimit,ortoleranceforrunout.Thereisasimpleruleofthumb:foreveryinchofvalveheaddiametertheOEMwillallowfor0.0015"oftotalrunout.Higherrevvingengineswilldemandtightertolerances.
ValveclosurecanbecheckedbypaintingthefaceofthevalvewithPrussianBlue.Besurethatthevalveyouuseistrue.Insertthevalveintotheguideandapplylightpressure,turningthevalvebackandforth1/8"orso.Acontactpatternwillappearonthevalveface.Oneormoreopenspotsmayappear.Veryshortintermittentopenspots(shorterthanthedistancefrom12to1onaclock)donotindicateaproblemandwillpeenoutimmediatelywhentheenginefires.Largeropenspots(from12o’clockto2o’clockor3o’clock)canberemediedbyreturningthecuttertotheseatandlightlyturningthecutterafewrevolutionswiththefingers.Iftheopenspotislargerthan90°(12o’clockto3o’clock)repeatthethreecuttingsteps,makingverylightcuts,orcontactNewayManufacturingfortechnicalassistanceat(800)248-3889.
DIAL INDICATOR
CHECKS CONCENTRICITY ALL AROUND SEAT
PUT "BLUE" ON VALVE FACE
"BLUE" RUBS OFF AS CLEAN LINE ON THE VALVE FACE
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l1 0
special application carbide Blades
• Newayradiusbladesareusedtosmoothlyblendtheouterdiameterofthetopnarrowingangle(usually30°or15°)intothecombustionchamberwall.Stepsorridgesmayexistattheouterdiameterofseatsduetoarecessedseatorahemisphericallyshapedcombustionchamber.Theradiusbladeisinstalledinatopnarrowingangleandpositionedtocutoutthestepusingtheradiusedendoftheblade.Onebladeormultiplebladesmaybeused.
• Specialsteppedbladesmaybeusedonrecessedseatswhenitisnecessarytoclearthecasting.
Power unit
ANewaypowerunitwilldramaticallyincreaseyourproductivity.Thedriveunitrollsfreelyalongthetrackforpositioningoverthevalveseat.Thevariablespeedcontrolallowsforsettingthemosteffectiveturningspeed.Mostseatmaterialsarecutbetweenturningspeedsof20RPMto50RPM.Forharderseatmaterialsuseslowerspeed.ExcessiveRPM(70ormore)maycauseprematuredullingofblades.
Thetransmissionunitfromthemotortothecutterhastwouniversaljointsandatelescopingsection.Thesocketshouldbepositioneddirectlyoverthevalveseatbeingcut.
oPeratInG InstructIons
• Placecylinderheadontoheadstands.
• Insertpilot,asdescribedpreviously.
• Adjustcylinderheadsuchthatthepilotisalignedtothetransmission.
• Placecutterontopilotandcarefullylowercutterontothevalveseat.Donotdropthecutterasthismaygougetheseatand/orchipthecarbideblades.
GEAR MOTOR
TRANSMISSION
TROLLEY
TRACK
SOCKET
HEAD STANDS
HEAD STANDS
CYLINDER HEAD
PILOT
TOP NARROWING
SEAT
TOP NARROWING
INSERT
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l 11
Power unit (continued)
• Placesocketontothecutter.Besurethetransmissionis
linedupoverthepilot.Thetransmissionshouldbeasstraightaspossible.
• Usingthefootswitch,startthemotortoproceedwithseatcuttingaspreviouslydescribed.Holdingthehandleapplyonlylightdownwardpressure.Excessivepressuremayflexthepilotand/orcauseprematuredullingofblades.
• Formoreaggressivestockremovalalternatebladesmaybeused.ContactNeway.
Basic Parts list
solID PIlots
100 Series—Forusewith100SeriesCuttersonly—.297"(7,5mm)HubI.D.
140 Series—Forusewith200/600/700SeriesCuttersonly—3/8"(9,5mm)HubI.D.
HUB: 1.Adjustableonlyontwo-sidedNarrowingCutters—200and600Series.
2.Fixed(notmovable)onallotherCutters.
513—3/8" (9.5mm) Hexfor100SeriesHeads
505—1/2" (12.7mm) Hexfor200,600,700SeriesHeads
503-1—3/8" Adaptor1/2"to3/8"
FLAT HEAD SCREW
WEDGE
SET SCREW
3/32" HEX KEY
5/64" HEX KEY
HUBHEAD
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l1 �
Basic Parts list (continued)
eXPanDaBle PIlots
Colletdiametersare,1mm(.003")lessthanstated,andexpandupto,5mm(.020")
120 Series—Forusewith100SeriesHeadsonly—.297"(7,5mm)HubI.D.
150 Series—Forusewith200/600/700SeriesHeads—3/8"(9,5mm)HubI.D.
200 Series—Forusewith200/600/700SeriesHeads—3/8"(9,5mm)HubI.D.(Theyareforengineswithlongvalveguides)
tunGsten carBIDe BlaDes
PART # LENGTH USED IN
152.. . . . . . . . . . . . . . . . . .1/2". . . . . . . . . . . . . .Non-serratedBlade(correctioncutters)
154. . . . . . . . . . . . . . . . . . . 3/4". . . . . . . . . . . . . .Non-serratedBlade(correctioncutters)
250. . . . . . . . . . . . . . . . . . .3/8". . . . . . . . . . . . . .0°thru46°SeatCutters
250LC. . . . . . . . . . . .3/8". . . . . . . . . . . . . .0°thru46°SeatCutters(hardseats)
251. . . . . . . . . . . . . . . . . . .1/2". . . . . . . . . . . . . .0°thru46°SeatCutters
251LC. . . . . . . . . . . .1/2". . . . . . . . . . . . . .0°thru46°SeatCutters(hardseats)
252. . . . . . . . . . . . . . . . . . .1/2". . . . . . . . . . . . . .60°thru80°CorrectionCutters
253. . . . . . . . . . . . . . . . . 5/16". . . . . . . . . . . . .0°thru46°SeatCutters
254. . . . . . . . . . . . . . . . . . . 3/4". . . . . . . . . . . . . .60°thru80°CorrectionCutters
352. . . . . . . . . . . . . . . . . . .1/2". . . . . . . . . . . . . .RadiusBlade(blendingpurpose)
354. . . . . . . . . . . . . . . . . . . 3/4". . . . . . . . . . . . . .RadiusBlade(blendingpurpose)
355. . . . . . . . . . . . . . . . . . .3/8". . . . . . . . . . . . . .RadiusBlade(blendingpurpose)
353. . . . . . . . . . . . . . . . . 5/16". . . . . . . . . . . . .HondaPowerProducts(stepped)
553. . . . . . . . . . . . . . . . . 5/16". . . . . . . . . . . . .SuzukiMotorcycles(short-angled)
* LC(largecoursetooth)bladestendtobemoreeffectiveonthehardestseatmaterials.Theymayalsobeusedformoreaggressivestockremovalonregualrorsoftseatmaterials(e.g.toenlargeseatforoversizedvalve).
152, 154
250, 251, 253
250 LC, 251 LC
252, 254
352,354, 355
353
553
STEM COLLET EXPANDER NUT
*
*
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l 1 �
Helpful suggestions
clean up cylinder head after cutting seats.
Washorrinsethoroughlywithacleaningsolution.
take proper care of cutters and pilots.
Toolsshouldbekeptintoolcase.Whenremovedfromcase,theyshouldbeplacedonaclothorpad.Theseprecisioninstrumentswilllastalongtimeifreasonablecareisused.
take proper care of cutting blades.
Serrationsonthebladesshouldbecleanedregularlywiththebrushprovidedwitheachkit.Atoothbrushmayalsobeused.
HANDLE WITH CARE
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l1 �
Helpful suggestions (continued) cutting soft seats.
NewayCuttingFluid(awettingsolution)isrecommendedwhencuttingsoftseats.Thiswillreducechatterandimproveseatfinish.Neverusepetroleum-basedcuttingfluid.
cutting hard seats.
Neway'sL.C.(largecourse)bladesarerecommendedforcuttingespeciallyhardseats.Ingeneral,theyshouldnotbeusedonaveragetosoftseatmaterials.However,theymaybeusedonaveragetosoftseatswhereaggressivestockremovalistheobjective.Increasingcuttingpressure(feed)anddecreasingcuttingspeedwillalsoimproveresultsonhardseats.
repositioning worn or nicked blades.
ThecuttingbladesdoNOThavetobeinthesamerelativepositionofthehead.Bladesmaybeup,down,orcenteredintheirslots.Theywillalwaysbeonthesameplaneandangle.However,bladesmustextendovertheseatareatobecut,withpointedendstowardhub.Allbladesonthesamecuttingangleshouldbereplacedtogether.Sinceeachbladeisadjustable,wornportionsoranickcanbeadjustedawayfromthebladecontactarea.DONOTOVER-TIGHTEN.
assemble blades correctly.
Alwaysbesurepointedendsoncarbidebladesarepointingtowardthehub,orcenterofthehead.
HUB
ALWAYS TURN CLOCKWISE
HUB
POINTED ENDS OF BLADES
V a l V e S e a t C u t t e r I n S t r u C t I o n M a n u a l 1 �
troubleshooting
occasionally problems are encountered. here are simple solutions.
situations probable cause solution
Gouging Toomuchpressure.Turningspeedtoofast.
Applyonlylightpressure.Slowdown.UsetwohandsonT–Wrench.
Chatter Incorrectpressure. Applyonlylightpressure.
Loosepilot. Selectsnug-fittingpilotorreplacevalveguide.
Verysoftseats. ApplywettingsolutionsuchasNewayCuttingFluidonseats.DoNOTusepetroleum-basedcuttingfluids.
Eccentricity Toomuchpressure. Applyonlylightpressure.
Sideloadpressure. Applypressureovercenterlineofpilot.
Loosepilot. Selectsnug-fittingpilot,orreplacevalveguide.
Excessivevalveguidewear. Replacevalveguide.
“Load-up” in blade serrations
Toomuchpressure. Applyonlylightpressure.
Dirtoroil. Cleanserrations.
Excessive blade wear Toomuchpressure. Applyonlylightpressure.
Wrongbladeposition. Pointedendsofbladesmustbepointedtowardhub.
Blade chipping or breakage Roughhandlingorcutterdroppedontoseat.
Tungstencarbidebladesareveryhard,butbrittle,andshouldbehandledwithcare.
troubleshooting
occasionally problems are encountered. here are simple solutions.
situations probable cause solution
Gouging Toomuchpressure.Turningspeedtoofast.
Applyonlylightpressure.Slowdown.UsetwohandsonT–Wrench.
Chatter Incorrectpressure. Applyonlylightpressure.
Loosepilot. Selectsnug-fittingpilotorreplacevalveguide.
Verysoftseats. ApplywettingsolutionsuchasNewayCuttingFluidonseats.DoNOTusepetroleum-basedcuttingfluids.
Eccentricity Toomuchpressure. Applyonlylightpressure.
Sideloadpressure. Applypressureovercenterlineofpilot.
Loosepilot. Selectsnug-fittingpilot,orreplacevalveguide.
Excessivevalveguidewear. Replacevalveguide.
“Load-up” in blade serrations
Toomuchpressure. Applyonlylightpressure.
Dirtoroil. Cleanserrations.
Excessive blade wear Toomuchpressure. Applyonlylightpressure.
Wrongbladeposition. Pointedendsofbladesmustbepointedtowardhub.
Blade chipping or breakage Roughhandlingorcutterdroppedontoseat.
Tungstencarbidebladesareveryhard,butbrittle,andshouldbehandledwithcare.
Neway has been in business since 1952 manufacturing and distributing tools and equipment for valve seat reconditioning and valve reconditioning.
Our “trademark” product is the Neway valve seat cutter. Neway seat cutters are almost standard equipment
in shops that rebuild engines, whether the work is automotive, motorcycle, power equipment, or heavy
duty. Our tools are used all over the world in shops both big and small, by DIYers and production engine builders
alike. Neway cutters can be found at the track, in high performance test labs, and in use on OEM assembly lines. We believe that our product has been so successful for
one simple reason: it offers value. It's extremely easy to use, is accurate enough for high performance engine
work, and is inexpensive to purchase.
1-800-248-3889