SERVICE MANUAL NUMBER 23
TROUBLESHOOTING
Splashed Deposits
Spotted deposits, which sometimes occur after long delayed tune-up, accumulate after a
long period of misfiring. When normal combustion temperatures are restored, upon
installationofnewplugs,depositsloosenfromtopofpistonandheadandarethrownagainst
hot insulator. Plugs can be serviced (clean, file and re-gap) and reinstalled.
72423
Mechanical Damage
Mechanical damage to spark plug firing end is caused by foreign object in combustion
chamber. Because of valve overlap, small objects can travel from one cylinder to another.
Check all cylinders, intake manifold and exhaust material to prevent further damage.
Replace spark plugs.
72423
IMPORTANT: When working on engine, spark plug holes and carburetor throat
should be kept covered to prevent foreign objects from entering combustion
chamber.
90-861326--1 MARCH 1999
Page 1C-7
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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