TROUBLESHOOTING ENGINE PRIMARY SYSTEMS
.
Many troubleshooting procedures present hazards which can result in severe personal injury
or
lAWAR"Gl
death. Only qualified service personnel with knowledge
of
fuels, electricity, andmachinery hazards
should perform service procedures. Review safety precautions
on
inside cover page.
I
TROUBLE
I
Black Exhaust
Smoke
I
I
White or Blue
Exhaust Smoke
Engine Hunts
or Surges
POSSIBLE CAUSE
1.
Rich fuel mixture due to:
a. dirty air cleaner
*b. choke sticking
c.
incorrectly adjusted fuel
mixture screws
d. dirt in carburetor
*Gasoline sets only
1.
Lean fuel mixture due
to:
*a. incorrect float level
b. incorrectly adjusted fuel
mixture screws
c.
dirt in the carburetor
2.
Contaminated fuel
3.
Excessive engine wear
*Gasoline sets only
1.
Sticking or binding
governor linkage
2.
Incorrect governor adjustment
3.
Faulty governor spring
4. Incorrect fuel mixture due
to:
a. incorrectly adjusted
fuel mixture screws
*b. incorrect float level or
c. dirt in carburetor
5.
Governor mechanism worn
excessively or motion spring
faulty
6. Fuel supply problem caused by:
*a. Faulty fuel pump
b. Contaminated fuel supply
c. Vapor locking
d. Plugged fuel filter
7.
Carburetor icing
*Gasoline sets only
CORRECTIVE ACTION
1
a. Replace air cleaner
1
b. Clean choke and adjust or replace
I
i
n
kag e
1
c.
Adjust carburetor idle and
main adjustment screws
Id. Disassemble carburetor and clean
all internal passages
1
a. Adjust carburetor float level
1
b. Adjust carburetor idle and
main adjustment screws
1
c.
Disassemble carburetor and clean
all internal passages
2.
Drain and replace fuel
3.
See Engine Block Assembly section
1.
Check linkage alignment and straighten
or replace. Clean and lubricate
governor linkage
sensitivity
2.
Adjust governor speed and
3.
Replace governor spring
4a. Adjust carburetor main
and idle adjustment screws
4b. Adjust carburetor float level
4c. Disassemble carburetor and clean
all internal passages
5.
See Engine Block Assembly section
6a. Check fuel pump and replace
6b. Drain and refill fuel supply
6c. Check for cause of overheating
6d. Replace fuel filter
if
defective
*7.
In cold weather, place air
preheater in winter position
6-3
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