181
CID (3.0L) 4 CYLINDER GM ENGINE
SERVICE MANUAL NUMBER 26
Piston Failures
Pre-Ignition
Pre-ignition is abnormal fuel ignition, caused by combustion chamber hot spots. Control of
the start of ignition is lost, as combustion pressure rises too early, causing power loss and
rough running. The upward motion on the piston is opposed by the pressure rise. This can
result in extensive damage to the internal parts from the high increase in combustion cham-
ber temperature.
72424
Pre-Ignition Damage
CAUSES
1.
Hot spots in the combustion chamber from glowing deposits (due in turn to the use of
improper oils and/or fuels).
2.
3.
Overheated spark plug electrodes (improper heat range or defective plug).
Any other protuberance in the combustion chamber, such as an overhanging piece of
gasket, an improperly seated valve or any other inadequately cooled section of material
which can serve as a source.
Engine failures that result from the foregoing conditions are beyond the control of Mercury
Marine. No warranty will apply to failures which occur under these conditions.
Index
Page 3A-12
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