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8)
Restricked exhaust gas outlet.
Carbon deposit in combustion space.
9)
Engine detonating due
to
low
octane gasoline with heavy load at low speed.
11-5
ENGINE KNOCKS
1)
Gasoline
of
poor quality or low octane rating.
2)
Engine operating under heavy load at low speed.
3)
Carbon or lead deposits in cylinder head.
4)
Incorrect spark timing.
5)
Losse
or
burnt out connecting rod bearing.
6)
Worn
or
loose
piston pin.
7)
Engine overheated.
11-6
ENGINE
BACKFIRES
THROUGH
CARBURETOR
1)
Water
or
dirt
in gasoline
or
poor grade
of
gasoline.
2)
Sticky intake valve.
3)
Overheated valves, or hot carbon particles
in
engine.
4)
Engine cold.
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