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
| 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 |
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