SERVICE MANUAL NUMBER 25
TROUBLESHOOTING
Used Spark Plug Analysis
Use the following illustrations for determining serviceability of spark plug. Spark plug
condition also can suggest a variety of possible engine malfunctions and, therefore, can
indicate needed engine repairs. When old plugs are replaced, replace entire set. Perform
plug service only on those plugs suitable for additional service, using the following
procedures:
1.
2.
3.
Remove any oil deposits with solvent and dry plugs thoroughly.
Open electrode gap wide enough to permit cleaning and filing.
Remove combustion deposits from firing end of spark plug with a plug cleaner. Blow off
with compressed air to remove abrasives.
4.
File electrode surfaces to restore clean, sharp edges. Again remove filings with
compressed air.
5.
Reset gap to specifications by bending only side electrode with proper tool.
Normal Condition
Few deposits are present and probably will be light tan or gray in color. This plug shows that
plug heat range is compatible with engine, and engine is electrically and mechanically in
good running condition. With proper plug servicing (clean, file and re-gap), this plug can be
reinstalled with good results.
72420
Chipped Insulator
Chipped insulator usually results from careless plug re-gapping. Under certain conditions,
severe detonation also can split insulator firing ends. Replace spark plug.
72420
90-861328--1
NOVEMBER 1999
Page 1C-3
| 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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