TROUBLESHOOTING ENGINE PRIMARY SYSTEMS
lA
WARNING 1 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
Surges
Possible Cause
1.
Sticking or binding
(mechanical) governor linkage.
2.1ncorrect (mechanical) governor
adjustment.
3.
Faulty (mechanical) governor
spring.
4. Incorrect fuel mixture due to:
a.
incorrectly adjusted
fuel mixture screws.1
*
b.
incorrect float level.1. 2
c.
dirt in carburetor
d. ignition misfires
5. Intermittent electrical
connections.
6. Governor mechanism worn
excessively.
7.
Fuel supply problem caused by:
a.
Faulty fuel pump. 2
b.
Contaminated fuel supply. 2
c.
Vapor locking. 2
d. Plugged fuel filter
8. Carburetor icing.
2
1 - Prior
to
Spec F only
2 - Gasoline models only
Corrective Action
1.
Clean governor linkage (remove dirt or
ice buildup). Check that linkage
does not touch other parts.
2. Adjust governor speed and
sensitivity.
3.
Replace governor spring.
4a. Adjust carburetor main and
idle adjustment screws.
1
4b. Adjust carburetor float level.
1
4c. Disassemble carburetor and
clean all internal passages.1
4d. Check connections, see Ignition
section.
5.
Check battery and ignition connections.
6.
See Engine Block
Assembly section
..
7a. Check fuel pump and replace
if defective.
7b. Drain and refill fuel supply
7c. Check for cause of overheating
7d. Replace fuel filter.
8. In cold weather, place
air
preheater in winter position.
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