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 ENGINE
TROUBLESHOOTING
CAUSE
REMEDY
8. Valve springs weak or broken
8. Replace valve springs.
9. Incorrect valve timing
9. Reset timing. Install new gears or
camshaft as necessary.
10. Water or sediment in fuel tank of fuel
10. Drain and clean fuel tank. Replace fuel
filter.
filter element.
11. Air cleaner clogged
11. Service air cleaner.
12. Replace parts as necessary. Free-up
heat control valve.
Engine Knocking
1. Loose or worn main bearings (heavy, dull
1. Replace main bearings. Grind crankshaft
knock when accelerated under load)
and install undersize bearings if necessary.
2. Loose connecting rod bearings (condition
2. Replace rod bearings. Grind crankshaft
noted at idling speed or light load and knock
and install undersize bearings if necessary.
diminishes as load is increased)
3. Loose piston pins (sharp metallic rap at
3. Install oversize pins or piston assembly.
idling speed or when starting cold engine)
4. Loose pistons (noted at low speeds, espe-
4. Bore cylinders and install oversize piston
cially with a cold engine)
assemblies.
5. Overheated engine
5. Refer to "Overheating."
6. Insufficient lubricating oil
6. Drain oil., and refill to "Full" mark on
gauge.
7. Loose flywheel
7. Replace flywheel if mounting holes are
elongated or pilot hole is out-of-round.
Tighten mounting nuts to correct tension.
Replace crankshaft if flywheel mounting flange
is out-of-round.
8. Excessive crankshaft end play (indicated
8. Install new crankshaft thrust bearing.
by an intermittent knock which will come and
go when clutch is operated or load is re-
leased and engaged.)
9. Excessive camshaft end play (noise usually
9. Install new camshaft thrust bearing.
occurs at half engine speed)
B-28
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