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 ENGINE
TROUBLESHOOTING
CAUSE
REMEDY
10. Bent connecting rod
10. Straighten or, if necessary, replace the
connecting rod. Replace the piston assembly
if necessary.
Operating Knocks
1. Pre-ignition
1. Clean spark plugs. Install spark plugs of
a lower heat range.
2. Ignition timed too early
2. Adjust timing to specifications.
3. Low octane fuel
3. Fill tank with fuel of higher octane rating.
4. Overloading
4. Use lower gear or reduce load.
5. Excessive accumulation of carbon in com-
5. Clean or remove carbon deposits.
bustion chamber
6. Hot spot in combustion chamber due to
6. Remove carbon and open water passage.
carbon deposit or clogged water passage
7. Engine operating too hot
7. Refer to "Overheating."
8. Carburetion or fuel mixture incorrect
8. Check carburetor. Reset, repair or re-
place as necessary.
9. Spark plug gaps too wide
9. Adjust gaps corre ctly.
Explosion In Muffler
1. Ignition too late
1. Correct ignition timing.
2. Weak spark
2. Check condenser, distributor, coils and
wires. Adjust and replace parts as necessary.
3. Exhaust valves holding open
3. Check tappet clearance, springs and guides.
Clean and replace parts as necessary.
4. Exhaust valves warped
4. Reface or replace.
Explosion In Carburetor Or Air Cleaner
1. Fuel mixture too lean
1. Clean carburetor, check fuel level in bowl.
2. Intake valves holding open
2. Check tappet clearance, springs, guides,
etc.
B-29
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