TROUBLESHOOTING
SERVICE MANUAL NUMBER 26
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 can 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.
72422
Reversed Coil Polarity
Concave erosion of ground electrode is an indication of reversed polarity. Center electrode
will show only normal wear. Engine will misfire and idle rough. To correct, reverse primary
coil leads. Replace spark plugs.
72422
Index
Page 1C-6
90-861329--1 MARCH 1999
| 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