SERVICE MANUAL NUMBER 26
TROUBLESHOOTING
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
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
Index
90-861329--1
MARCH 1999
Page 1C-5
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 181 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(6 votes, average: 5 out of 5)
Marine readers have rated Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26 5.0 out of 5.0 based on 6 product reviews. Thanks for sharing this material. Helps a lot after suffering with bad mechanics. spend too much money and nothing very good
great manual, makes impossible jobs possible. without a manual you can not do the job, a must have.
Great resource. Excellent information provided.
Need help to install automate choke
Need help to instal automate choke