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1977 165hp engine dies

H

hammond

New member
"Hello all. I am trying to nu

"Hello all. I am trying to nurse a boat back from several long periods of non-use and thought I had all the right service done at a marina. Aside from some outdrive work, they replaced the fuel in the tank, flushed fuel system, replaced spark plugs, fuel filter, oil and water filter, water pump, gear lube and cleaned and rebuilt carb. They also replaced a bad fuel sender. They water tested it and said it ran great.

On my first outing (about two months later,) had some trouble starting it, but eventually got it working. There was a new noise I had never heard before: sounded like a loud pneumatic pressure discharge about 1/2 sec long. I used it for about an hour and put it away for a week. The next weekend it ran fine for about 4 hours, then would only run slightly above idle... any faster it would sputter and die. The hiss/pop came back when trying to start or soon after starting.

Is that hiss/pop I'm hearing a backfire? After reading the forum, it sounds like a lot of these issues are fuel or carb related, but I would have thought the service would have fixed it...

Thanks,
Tom"
 
"Tom:

The hiss/pop is backf

"Tom:

The hiss/pop is backfiring; comes from a lean condition, plug wires cross firing, burned valve or out of time due to a worn chain. How old is the fuel pump? It may be on it's last leg since you awakened it.

Did they do a compression check on the engine?"
 
"Guy,

Thanks for your thoug

"Guy,

Thanks for your thoughts. A compression test was done in late 2006 and was good, but I don't think the fuel pump has been replaced in many years. Perhaps that is a good place to start. Thanks"
 
"Tom:

"ran fine for abo

"Tom:

"ran fine for about 4 hours, then would only run slightly above idle... any faster it would sputter and die. The hiss/pop came back when trying to start or soon after starting."

I thought about the above part of the problem. Maybe the old coil is failing from age.

Did the dealer replace the filter in the dome of the fuel pump? Look at your paperwork for a reference. See item #2 below.

http://www.mercruiserparts.com/Show_Pictures3.asp?dnbr=%2057569&ivar=images/CRUI SER/57569/7.png&inbr=983&bnbr=30&bdesc=FUEL+PUMP+AND+CARBURETOR"
 
"Next time it messes up, check

"Next time it messes up, check for correct strong spark; faint white or orange is a weak spark. Spark should jump from plug wire 1/4" w/an audible snap. The spark should be CONSISTENT while cranking. I use a spare plug wire attached to the coil w/the other end boot pulled back to expose the electrode. Hold the wire w/the bare electrode near the engine block while someone else cranks. KEEP FIRE EXTINGUISHER IN ONE HAND.

Coil part number 898253T24

http://www.marineengine.com/newparts/part_details.php?pnum=MER898253T24&ptype=&E ngine=&Model="
 
"Guy,

Thank you so much for

"Guy,

Thank you so much for all of your comments!! It may take me a few weeks to try all your suggestions. I'm determined to get this boat running great again, and am likely to do more of the work myself due to cost constraints and personal interest.

I've included a snapshot of the parts list from the last two servicings, as well as the text from the recent servicing. I think I'm still under warranty from the recent service, but no longer live in the same area so they probably wouldn't be able to do anything anyway.

Service 1 performed late 2006:
220356.jpg
service1.jpg""">

Service 2 performed July 2008:
220357.jpg
service2a.jpg""">
220358.jpg
service2b.jpg""">

This is the text from service 2:
CUST STS NOT RUN IN 12 MONTHS – PLEASE CHECK MOTOR AND START. CAUSE: REMOVED OLD FUEL FROM FUEL TANK AND FLUSHED FUEL SYSTEM. PERFORMED ANNUAL SERVICE TO INCLUDE REPLACEMENT OF SPARK PLUGS, FUEL FILTER, OIL & WATER, WATER PUMP, GEAR LUBE AND NEUTRAL SAFETY SWITCH (FOUND CORRODED). ALSO, GREASED ALL FITTINGS AND PROP SHAFT, NEXT, REMOVED, DISMANTLED, CLEANED, REBUILT AND REINSTALLED CARBURETOR. REMOVED OUTDRIVE FOR INSPECTION AND FOUND YOLK, CROSS-BEARINGS AND GIMBAL BEARING CORRODED. UPON AUTHORIZATION REPLACED GIMBAL BEARING, YOLK ASSEMBLY AND CROSS-BEARINGS. DISMANTLED OUTDRIVE, REBUILT AND RESEALED, PRESSURE TESTED LOWER UNIT TO MAKE SURE NO LEAKS WERE PRESENT. FILLED LOWER UNIT WITH GEAR LUBE AND RE-INSTALLED. FINALLY ADDED FRESH FUEL TO GAS TANK, ANS WATER TESTED VESSEL TO VERIFY PROPER OPERATIONS.

CUST. STS FEUL GUAGE INOP. CAUSE: FOUND BAD FUEL SENDER, REPLACED FUEL SENDER AND TESTED TO VERIFY PROP AND INSPECTED RELATED WIRING. TESTED TO VERIFY PROPER OPERATION.

CUST. STS OUTDRIVE GOES UP AND LEAKS DOWN QUICKLY. CAUSE: FOUND TRIM PUP LEAKING OIL INTO BILGE AREA. REPLACED FAILED O-RINGS IN TRIM PUMP BAS. REMOVE OLD FLUID AND FILL WITH NEW. CLEAN BILGE AREA TO REMOVE OIL. BLEED SYSTEM AND TEST TO VERIFY PROPER OPERATION"
 
"Take your time. Look for a u

"Take your time. Look for a used factory manual on eBay. Whenever you put fuel in the tank, add STABIL fuel preservative per instructions on bottle. Get the pint or quart size. It will keep the fuel fresh for a year. Pour it into the tank first then add fuel from a reliable brand."
 
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