Vibration Mis-firing or pre-
ignition
See correction under mis-firing and pre-ignition.
Loose foundation
or foundation bolts
Propeller shaft out
of line or bent
Propeller bent or
pitch out of true
Pre-Ignition Defective spark
plugs
Check all spark plugs for broken porcelain, burned electrodes or
electrodes out of adjustment. Replace all defective plugs or
clean and reset
Improper timing See instructions for retiming
Engine carbons Remove cylinder head and clean out carbon
Engine overheating See correction under "Engine Temp." portion of this table.
Back-Firing Insufficient fuel
reaching engine
due to dirty lines,
strainer or blacked
fuel tank vent.
Water in fuel.
See correction under "Engine will not start" portion of this table.
Poorly adjusted
distributor.
See correction under "Engine will not start" portion of this table.
Low Oil
Pressure
Too light body oil Replace with proper weight oil.
Oil leak in pressure
line
Inspect all oil lines. Tighten all connections.
Weak or broken
pressure relief
valve spring.
Replace spring
Worn oil pump Replace pump
Worn or loose
bearings
Replace bearings
Oil Pressure
too high
Too heavy body oil Drain oil and replace with oil of proper weight
Stuck pressure
relief valve
Clean or replace valve
Dirt or obstruction
in lines
Drain and clean oil system. Check for bent or flattened oil lines
and replace where necessary.
Sludge in oil Infrequent oil
changes
Drain and refill with proper weight oil
Water in oil Drain and refill. If trouble persists, check for cracked block,
defective head gasket and cracked head.
Dirty oil filter Replace filer (if one is mounted on engine)
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