Mercury Mariner Download 1965 1989 Service Manual 45 to 115 Hp Outboard

Transcript of Mercury Mariner Download 1965 1989 Service Manual 45 to 115 Hp Outboard

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4- 10 FUEL

t h e fuel line, the fuel pickup in the tank, t h e fue l f i i ter , anti-siphon valve, t h e fuel tank vent, and excessive foreign m a t t e r in the fue l tank, and loose fuel f i t t ings sucking a i r into the system. Improper size fuel f i t t ings can also res t r i c t fuel flow.

On most installations, the fuel line is provided with quick-disconnect f i t t ings at the tank and at t h e engine. If there is reason t o believe t h e problem is at the quick-disconnects, the hose ends should be replaced as an assembly. For a small addi- tional expense, the en t i re fuel line can be replaced, thus el iminating th is a r e a as a problem source for many fu tu re seasons.

The primer squeeze bulb can be replaced in a shor t time. Fi rs t , c u t t h e hose line as close t o the old bulb a s possible. Slide a small c lamp over the end of the fuel line from the tank. Next, install t h e SMALL end of the check valve assembly in to this side of the fuel line. The check valve always goes towards the fuel tank. Place a large c lamp over the end of the check valve assembly. Use Primer Bulb Adhesive when t h e connec- tions a r e made. Tighten the clamps. Re- pea t the procedure with the o ther side of the bulb assembly and t h e line leading t o t h e engine.

If the engine will M, make every attempt t o regain satisfactory performance by making carburetor adjust- ments, before assuming the carburetor is at fault.

ROUGH ENGINE IDLE If an engine does no t idle smoothly, t h e

most reasonable approach t o t h e problem is t o perform a tune-up t o e l iminate such a reas as: defect ive points; faul ty spark plugs; and timing o u t of adjustment.

Other problems t h a t can prevent an en- gine from running smoothly include: An a i r leak in t h e in take manifold; uneven com- pression between t h e cylinders; and sticky or broken reeds.

Of course any problem in t h e carburetor af fect ing t h e a i r f fuel mixture will also pre- vent the engine f rom operating smoothly at idle speed. These problems usually include: Too high a fuel level in the bowl; a heavy float; leaking needle valve and seat; defec- tive au tomat ic choke; and improper adjust- ments fo r idle mixture o r idle speed.

EXCESSIVE FUEL CONSUMPTION Excessive fuel consumption can be the

result of any one of th ree conditions, or a combination of al l three.

1- Inefficient engine operation. 2- Faulty condition of the hull, including

excessive marine growth. 3- Poor boating habits of the operator. If t h e fuel consumption suddenly increas-

e s over what could be considered normal, then the cause can probably be a t t r ibuted t o the engine or boat and not the operator.

Marine growth on t h e hull can have a very marked e f f e c t on boat performance. This is why sail boats always t ry t o have a haul-out a s close t o race t ime as possible. While you a r e checking t h e bottom take

usually the result of leaving the boat in the water for long periods of time. The time for such growth to develop is drastically shortened in salt water and in warm temperatures. Such a condition seriously hinders proper performance.

no te of t he propeller condition. A ben t blade or o the r d a m a g e will defini tely c a u s e poor boa t per formance .

If t he hull and propeller a r e in good shape , t hen check t h e fue l sys tem fo r possi- ble leaks. Check t h e l ine be tween t h e fue l pump and t h e ca rbu re to r while t h e engine i s running and the l ine be tween the fue l t ank and t h e pump when t h e engine is not run- ning. A l eak be tween t h e t a n k and t h e pump many t i m e s will not a p p e a r when t h e engine i s opera t ing , because t h e suc t ion c r e a t e d by t h e pump drawing fue l will not a l low t h e fue l t o leak. Once t h e engine is turned off and the suc t ion no longer ex is t s , fue l m a y begin t o leak.

If a minor tune-up h a s been per formed and t h e spark plugs, points , and t iming a r e properly adjusted, then the problem m o s t l ikely is in t h e ca rbu re to r and a n overhaul i s in order . Check t h e needle valve and seat f o r leaking. In an e f f o r t t o conserve fue l , use e x t r a c a r e when making a n y ad jus tmen t s a f f e c t i n g t h e fue l consumption, such as t h e f l o a t level o r a u t o m a t i c choke.

ENGINE SURGE

If t he engine o p e r a t e s as if t h e load on t h e boa t is being cons tant ly increased a n d decreased , even though a n a t t e m p t i s being m a d e t o hold a cons t an t engine speed , t h e problem can mos t likely be a t t r i b u t e d t o t h e fuel pump, o r a res t r ic t ion in t h e fue l l ine be tween the t a n k and t h e ca rbu re to r .

Opera t ional descript ion and serv ice pro- c e d u r e s fo r the fue l pump a r e given in Sec t ion 4- 1 1.

ANTI-SYPHON VALVE

WORDS ON REQUIREMENT A t press t ime , in t h e United S t a t e s ,

t h e r e is no governmenta l regulat ion requir- ing a n outboard moto r t o be equipped with a n anti-syphon valve. However , boa t s com- plying with the Boating Industry Associat ion (MA) Cer t i f i ca t ion P rogram, vessels wi th permanent ly instal led fue l tanks a r e requir- e d t o have a n anti-syphon valve. Bear in mind, t h e BIA sets a s t anda rd which i s not subjec t t o e n f o r c e m e n t by any gove rnmen t agency.

An anti-syphon va lve is considered an "After Market" i t e m , not instal led by t h e f ac to ry . Many people consider such a de-

ENRICHEMR SYSTEM 4-1 1

vice t o b e a s a f e t y i t e m , b u t m o r e o f t e n than not , t h e valve m a y cause m o r e prob- lems in t h e fue l del ivery sys tem t h a n t h e y solve.

If t he valve becomes the l e a s t b i t clog- ged with debr is o r a t o o sma l l va lve i s instal led in t he fue l l ine, o r t h e spr ing i s t o o s tou t , a pressure drop m a y develop f rom o n e side of the valve t o t he o ther . A pressure drop ac ros s t h e anti-syphon valve can c a u s e poor powerhead pe r fo rmance and possible damage.

A de fec t ive or poorly ope ra t ing ant i - syphon valve m a y c a u s e one o r m o r e of t h e following problems:

Inadequate fue l pump pressure. Loss of power at t h e powerhead. Powerhead surge a t high speed rpm. Piston dome erosion due t o preignit ion o r

de tonat ion . Poor powerhead pe r fo rmance during ac-

ce le ra t ion -- uni t f a l t e r s o r c u t s o u t com- pletely.

Powerhead f a i l s t o o p e r a t e smoothly -- runs "rough".

Powerhead c a n n o t be s t a r t ed .

Checking Anti-Syphon Valve If t roubleshooting should indica te t h e

anti- syphon va lve is at f au l t , a t t e m p t t o o p e r a t e t he powerhead with a s e p a r a t e fue l source. In o t h e r words, t h e valve i s physi- ca l ly bypassed.

If the valve proves t o be the source of t h e problem, e i t h e r r emove t h e valve f r o m t h e fuel line or rep lace the va lve with a solenoid o p e r a t e d fue l shutof f valve.

4-4 ENRICHENER SYSTEM

Some l a t e mode l powerheads cove red i n this manual a r e equipped with a n en r i chene r sys t em, rep lac ing t h e t rad i t ional choke sys- t e m .

An e l ec t r i ca l ly ope ra t ed en r i chene r valve moun ted on t h e po r t s ide of t h e pow- e r h e a d , as shown in the accornpanying illus- t r a t ion , is supplied wi th fue l via a fue l l ine f r o m t h e f l o a t bowl of t h e t o p (No. I ) carbu- re tor .

When the ignition key i s r o t a t e d t o t h e ON position and pushed inward t o s t a r t a cold powerhead, t h e enr ichener sys t em is energ ized . File1 is t h e n f e d t o a l l cy l inders through sho r t hoses and f i t t i ngs at the in-


Engine FinderTable of ContentsChapt 1 - SafetyChapt 2 - TuningChapt 3 - PowerheadChapt 4 - FuelChapt 5 - IgnitionChapt 6 - Timing & SynchronizingChapt 7 - ElectricalChapt 8 - Remote ControlsChapt 9 - Tilt MechanismChapt 10 - Lower UnitChapt 11 - Hand Rewind StarterChapt 12 - MaintenanceAppendixWiring Diagrams

Mercury Mariner Download 1965 1989 Service Manual 45 to 115 Hp Outboard

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Transcript of Mercury Mariner Download 1965 1989 Service Manual 45 to 115 Hp Outboard