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ENGINE TROUBLESHOOTING
Trouble
Engine cranks but fails
to start
Engine does not crank
Engine starts, runs and
shuts down
Backfire through carburetor
possible Cause
1.
Out of fuel
2.
Engine flooded
3.
Filters clogged by contaminated
fuel
4.
voltage drop at
(+)
on overspeed
switch
5.
Worn or faulty spark plugs
6.
Bad ignition coil
7.
High-tension leads grounding
(system wet)
8.
Automatic shutdown switch faulty
9.
Fuel pump inoperative, filter
clogged
10.
Filter in carburetor clogged
11.
Faulty overspeed switch (reset
and start)
(Lift Tl coil connection)
12.
Engine circuit breaker tripped
1.
Battery low or dead
2.
Sea water in cylinders
3.
Loose battery connection
4.
Voltage drop at starter
solenoid terminal
5.
Bad starter solenoid
6.
Faulty START switch
7.
Engine DC circuit breaker
tripped
1.
Faulty automatic shutdown
switch
2.
Faulty overspeed switch (reset
and start, lift Tl coil if
switch will not reset.)
3.
Faulty fuel pump
4.
Faulty STOP switch
5.
Engine circuit breaker tripping
6.
Dirty fuel filters
7.
Low oil level in sump
1.
Ignition timing wrong
2.
Engine flooding
3.
Choke stuck closed
4.
Plug wires wrong - check firing
order
5.
Distributor cap cracked
6.
Dirty air cleaner
40
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