SERVICE MANUAL NUMBER 25
TROUBLESHOOTING
High Speed Glazing
Insulator has yellowish, varnish-like color, indicating that temperatures suddenly have risen,
usually during hard, fast acceleration under heavy load. Normal deposits do not get a
chance to blow off. Instead, they melt and form a conductive coating. Replace plugs. If
condition recurs, use colder heat range plug and service plugs more frequently.
72421
Scavenger Deposits
Powdery white or yellow deposits are built up on shell, insulator and electrodes. This is
normal appearance with certain branded fuels. Accumulation on ground electrodes and
shell areas may be unusually heavy, but may be easily chipped off. Plugs may be serviced
(clean, file and re-gap) and reinstalled.
72422
Pre-Ignition Damage
Pre-ignition damage is caused by excessive high temperatures. Center electrode melts
first, followed by ground electrode. Normally, insulators are white but may be dirty if plug has
been misfiring. Check for correct plug heat range, advanced ignition timing, lean fuel
mixture, incorrect fuel used, malfunctioning cooling system, leaking intake manifold or lack
of lubrication. Replace spark plugs.
72422
90-861328--1
NOVEMBER 1999
Page 1C-5
| 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.