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Page Title:
Table 4-2. Troubleshooting - Continued |
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 Table 4-2. Troubleshooting - Continued
Malfunction
Probable cause
Corrective action
12. Engine lacks power
e.
Oil system failure
e.
Report to direct support or general
-Continued
support maintenance personnel.
f.
Air cleaner dirty
f.
Clean air cleaner change oil in cup
g.
Spark plug gaps too wide
g.
Reset gaps (para 4-37}.
h.
Choke partially closed, or throttle
h.
Adjust choke accelerator pedal
not opening fully
and governor linkage (para 4-19
and 4-24).
i.
i.
Remove obstructions or replace
obstructed
parts (para 4-26).
j.
Improper tappet adjustment
j.
Adjust tappets (para 4-1).
k.
Lack of fuel
k
Clean filter inspect fuel pump.
inspect carburetor for water or
dirt, and replace if necessary.
13. High engine oil consumption.
a.
High engine speeds.
a.
Adjust governor (para 4-22).
b.
Improper grade of oil or diluted
b.
Use new oil of proper grade..
oil.
c.
Overheating of engine causing
c.
See "Engine overheats." item 24
thinning of oil.
below.
14. Low engine oil pressure.
a.
Insufficient oil supply.
b.
Improper grade of oil or diluted oil
foaming at high speeds.
ventilator, and inspect for water
in oil.
c.
Oil too heavy.
c. Change to prosper grade oil. Refer
to lubrication order.
15. Poor engine compression.
Incorrect tappet adjustment.
16. Fuel does not reach carburetor.
a. No fuel in fuel tank.
a. Fill fuel tank.
b. Fuel filter clogged.
c. Fuel line air leak between tank
and fuel pump.
d. Fuel line clogged.
d.
Disconnect and blow out lines.
e. Fuel tank cap vent clogged.
e.
Clean vent.
f.
Fuel pump defective.
f.
Replace pump (para 4-20).
17. Fuel reaches carburetor, but does
a. Choke not closing.
a.
Adjust choke control (para 4-19)
not reach cylinders.
b. Fuel passage in carburetor
b.
Replace carburetor (para 4-19).
clogged.
c. Carburetor float valve stuck
c
Replace carburetor (para 4-19)
closed.
18. High fuel consumption.
a. Correct adjustment of carburetor.
a.
Adjust carburetor (para 4-19)
b. Vehicle overloaded.
b.
Reduce loads to specified
minimum capacity.
c.
High engine speeds.
c.
Readjust governor (para 4-22).
d.
Air cleaner clogged.
d.
Clean air cleaner and change oil in
cup (para 4-25).
e.
Carburetor float level too high;
e.
Replace carburetor (para 4-19)
accelerating pump not properly
adjusted.
f.
Fuel line leaks.
f.
Correct leaks; replace lines (para
g.
Carburetor parts worn or broken.
g.
Replace carburetor (para 4-19)
h.
Fuel pump pressure too high or
h.
Replace fuel pump (para 4-20)
diaphragm leaking.
i.
Engine running cold.
i.
Inspect thermostat I para 4-29). In
cold weather, cover air intake
under driver heat.
j.
Ignition incorrectly timed.
j.
Reset timing (para 4-36)
k.
Spark advance stuck.
k.
Replace distributor (para 4-36)
l
Leaking fuel filter bowl gasket.
I.
Replace gasket (para 4-23).
m.
Choke partially closed.
m.
Adjust choke control (para 4-19).
n.
Engine idling too fast.
n.
Adjust carburetor idle speed
adjust screw (para 4-19).
o.
Spark plugs dirty.
o.
Clean and gap or replace spark
plugs (para 4-37).
p.
Weak coil.
p.
Replace coil (para 4-38).
q.
q.
Remove obstruction replace
pipe.
defective parts (para 4-26).
4-5
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