12-5
ENGINE KNOCKS
/-
1)
Low-quality gasoline.
2)
Engine operating under heavy load at low speed.
3)
Carbon or lead deposits in the cylinder head.
4)
Spark timing incorrect.
5)
Loose
connecting rod bearing due
to
wear.
6)
Loose
piston
pin
due
to wear.
7)
Causes
of
engine overheat.
12-6
ENGINE BACKFIRES through CARBURETOR
1)
Water or dirt
in
gasoline, or low-grade gasoline.
2)
Intake valve stuck.
3)
Valves overheated, or red-hot carbon particles in the combustion chamber.
4)
Engine cold.
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36
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