TROUBLESHOOTING ENGINE PRIMARY SYSTEMS
Many troubleshooting procedures present hazards which can result in severe personal injury
or
laWAR"Gl
death. Only qualifiedservice personnel with knowledge
of
fuels, electricity, andmachinery hazards
should perform service procedures. Review safety precautions
on
inside cover page.
Engine Lacks
Power
POSSIBLE
CAUSE
1.
Faulty ignition due
to:
a. incorrect spark plug gap
b. incorrect ignition timing
2.
Dirty air cleaner
3. Restricted fuel flow due
to:
*a. Plugged fuel filter or
*b. faulty fuel pump
dirty or defective.
4.
Incorrect fuel mixture due
to:
a. incorrectly adjusted
fuel mixture screws
*b. incorrect float level or
c. dirt in carburetor
d. vacuum leak
c.
LPG
-
Regulator or fuel solenoid
5.
Exhaust system blocked or
restricted
6.
Incorrect valve lifter
7.
No
load speed set
too
low
8.
Excessive engine wear or
damage to engine
9.
Carburetor air preheater
set incorrectly
*Gasoline sets only
1.
Restricted air flow due
to
dirt or debris blocking air
inlet or outlet
clearance or defective valve(s)
2.
Dirt or oil covering engine
3. Incorrect ignition timing
4.
Cooling fan plugged or broken
cooling fins
5.
Lean fuel mixture due to:
a. incorrectly adjusted
fuel mixture screws
*b. incorrect float level
c. dirt in carburetor
*Gasoline sets only
CORRECTIVE
ACTION
1
a. Reset spark plug gap
1
b. Replace magneto assembly
2.
Replace air cleaner
3a. Replace fuel filter
3b. Test fuel pump and replace if faulty
3c. Refer
to
LPG
Fuel section.
4a. Adjust carburetor main
and idle adjustment screws
4b. Adjust carburetor float level
4c. Disassemble carburetor and clean
all internal passages
4d. Repair vacuum leak.
5.
Locate and remove cause of blockage,
remove and clean spark arresting
screen
6.
Adjust valve lifters/inspect valves
(see Engine Block Assembly section)
7.
Adjust governor setting
8.
See Engine Block Assembly section
9.
In hot weather, place air preheater
in summer position
1.
Clear away any debris that may
restrict airflow to set and do not
use compartment for storage area
2.
Clean away all dirt and oil from
engine cooling
fins
3.
Replace magneto assembly
4.
Inspect cooling fan, see Generator
Service section
5a. Adjust carburetor main
and idle adjustment screws
5b.
Adjust
carburetor float level
5c. Disassemble carburetor and clean
all internal passages
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