7)
Engine operated
in
closed space without fresh
supply
of
cooling air.
8)
Restricked exhaust gas outlet.
9)
Engine detonating due to low octane gasoline
with
heavy load at low speed.
Carbon deposit in combustion space.
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)
Lose
or
burnt out connecting rod be.aring.
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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40
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