Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3

262
CID (4.3L) ENGINES
SERVICE MANUAL NUMBER 25
Piston Failures
NOTE: Engine failure due to pre ignition or detonation are beyond  the control of Mercury
MerCruiser. No warranty will apply to failures that occur under these conditions.
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
chamber temperature.
72424
Pre-Ignition Damage
a
b
c
d
72314
Combustion Differences
a  - Ignited By Hot Deposits
b  - Regular Ignition Spark
c  - Ignites Remaining Fuel
d  - Flame Front Collide
Index
Page 3A-16
90-861328--1 NOVEMBER 1999
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1998, 1999, 2000, 2001
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Mercury-MerCruiser GM V6 262 CID 4.3L Marine Engines Service Manual Number 25 Sections 1-3 SKU UPC Model
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