SERVICE MANUAL NUMBER 25
262 CID (4.3L) ENGINES
PRE-IGNITION 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.
Detonation
Detonation, commonly called “fuel knock,” “spark knock” or “carbon knock,” is abnormal
combustion of the fuel which causes the fuel to explode violently. The explosion, in turn,
causes overheating or damage to the spark plugs, pistons, valves and, in severe cases,
results in pre-ignition.
Use of low octane gasoline is one of the most common causes of detonation. Even with high
octane gasoline, detonation could occur if engine maintenance is neglected.
Index
90-861328--1
NOVEMBER 1999
Page 3A-17
| 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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