TROUBLESHOOTING
SERVICE MANUAL NUMBER 25
Wet Fouling (Oil Deposits)
Plug becomes shorted by excessive oil entering combustion chamber, usually in engine with
many hours of operation. Worn piston rings, cylinder walls, valve guides or valve stem seals
are causes of oil entering combustion chamber. Only engine repairs will permanently relieve
oil wet fouling.
IMPORTANT: New engines or recently overhauled engines may wet foul plugs before
normal oil control is achieved with proper break-in procedures. Such fouled plugs
may be serviced (clean, file and re-gap) and reinstalled.
72420
Cold Fouling
Dry, black deposits indicate rich fuel mixture or weak ignition. Clogged flame arrestor,
flooding carburetor, sticky choke or weak ignition components all are probable causes. If,
however, only one or two plugs in set are fouled, check for sticking valves or bad ignition
leads. After correcting cause, service (clean, file and re-gap) plugs and reinstall.
72421
Overheating
Insulator is dull white or gray and appears blistered. Electrodes are eroded and there is an
absence of deposits. Check that correct plug heat range is being used. Also check for
over-advanced ignition timing, cooling system malfunction, lean fuel/air mixtures, leaking
intake manifold or sticking valves. Replace spark plugs.
72421
Page 1C-4
90-861328--1 NOVEMBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 1262 CID, Mercury MerCruiser 262 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3 4.5 out of 5.0 based on 4 product reviews. This is great. I really like it. Thank you for providing this valuable opportunity for me.
if I can get the info that would be great
The information given is enoug .
In my opinion this is the best site on the net. Assisting people to do a job correctly and safely.