too low
Engine will
not start.
(Ignition
System)
Ignition switch "off"
or defective
Turn on switch or replace
Fouled or broken
spark plugs
Remove plugs and inspect for cracked porcelain, dirty points, or
improper gap.
Improperly set,
worn or pitted
distributor points.
Defective ignition
coil.
Remove center wire from distributor cap and hold within 3/8 inch
of motor block. Crank engine. Clean sharp spark should jump
between wire and block when points open. Clean and adjust
points. If spark is weak or yellow after adjustment at points,
replace condenser. If spark still is weak or not present replace
ignition coil.
Wet, cracked, or
broken distributor
Wipe inside surfaces of distributor. Dry with clean cloth. Inspect
for cracked or broken parts. Replace parts where necessary.
Improperly set,
worn, or pitted
magneto breaker
points. (Magneto
models only)
Remove spark plug wire and hold within 3/8 inch of engine
block. Clean, sharp spark should jump between wire and block
when engine is cranked. If spark is weak or not present clean
and adjust breaker points.
Engine will
not start.
(Poor
compression
and other
causes)
Improperly set,
worn, or pitted
timer points.
Defective coil or
defective
condenser.
Remove spark plug wire and hold within 1/8" inch of engine
block. A clean sharp spark should hump between wire and block
when engine is cranked. Clean and set timer points. If spark still
is not present when engine is cranked, replace coil.
Improper timing Set timing.
No Oil
Pressure
Defective gauge or
tube.
Replace gauge or tube.
No oil in engine Refill with proper grade oil.
Dirt in pressure
relief valve
Clean valve
Defective oil pump,
leak in oil lines or
broken oil pump,
oil lines or broken
oil pump drive.
Check oil pump and oil pump drive for worn or broken
connections.
Loss of
RPM (Boat
or
associated
equipment)
Damaged propeller Repair propeller
Bent rudder Repair
Misalignment Realign engine to shaft
Too tight stuffing
box packing gland
Adjust
Dirty boat bottom
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