TROUBLESHOOTING ENGINE PRIMARY SYSTEMS
lA
WARNING I Many troubleshooting procedures present hazards which can
result
in severe personal
injury
or
death. Only
qualified
service personnel with knowledge
of
fuel, electricity,
and
machinery
hazards
should
perform service procedures. Review safety precautions
on
inside
cover
page.
Trouble
Engine
Lacks
Power
Possible Cause
1.
Faulty ignition due to incorrect
spark plug gap.
2.
Dirty air cleaner.
3.
Restricted fuel flow due to:
a.
Plugged fuel filter.
b.
Faulty fuel pump.
4.
Incorrect fuel mixture due to:
a.
incorrectly adjusted fuel
mixture screws.1
b.
incorrect float level.1, 2
c.
dirt
in
carburetor.
d.
vacuum leak.
e.
altitude setting.
5.
Exhaust system blocked or
restricted.
6.
Incorrect valve tappet clearance.
7.
Excessive engine wear or
damage to engine.
8.
Carburetor air preheater set
incorrectly.
2
9.
Combustion chamber deposits.
Corrective Action
1.
Reset spark plug gap.
2.
Replace air cleaner.
3a. Replace fuel filter.
3b. Test fuel pump and repair or replace
if faulty.
4a. Adjust carburetor main and idle
adjustment screws.1
4b. Adjust carburetor float level.
1
4c. Disassemble carburetor and clean all
internal passages.
1
Replace fuel filter.
4d. Repair vacuum leak.
4e. Reset altitude adjust knob on carburetor.
5.
Locate and remove cause of blockage.
6.
Adjust valve tappets (see Engine Block
Assembly
section).
7.
See Engine Block Assembly section.
8.
In
hot weather, place air preheater
in
summer position.
9.
Clean combustion chamber.
10.(Spec A sets) No-ioad speed 10. Adjust (mechanical) governor.
set too low: excessive
governor droop.
11.Contaminants
in
LPG regulator. 1
11.
Clean LPG regulator.
(liquid-withdrawal systems}
1 - Prior to Spec F only
2 - Gasoline models only
6-2
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