Probable cause
Possible remedy
Insufficient coolant
Insufficient coolant
Add water
to
prescribed level.
Overheating
Water leak
in
unit seal
of
water
Replace part (s)
pump
'Crack
in
crankcase water jacket
Replace crankcase.
Water leak
in
other parts
Check, and repaU.
Failure
of
radiator
to
Air
in cooling system
Bleed
aU
by
loosening
aU
bleed
dissipate heat properly
plug,
drain plug, or hose clamp.
Rust
and
scale deposited in
Flush.
radiator
Dust
and
dirt around radiator
Flush.
Slippage
of
fan belt
Adjust' belt tension.
Inoperative thermostat
Replace.
(kept closed)
Radiator dissipates heat
Extremely low atmospheric
excessively temperature
Uncovered radiator
Cover radiator.
Inoperative thermostat Replace part (s).
(kept open)
Jammed moving parts
Sticking cylinders, pistons
RepaU and replace part (s)
if
or piston rings necessary.
Sticking main bearings and RepaU and replace part (s)
if
'
crankpin bearings
necessarr·
Sticking
cam bushing and
idler bushing
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67-
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