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Page Title:
Table 2-1. Troubleshooting - CONT |
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 Corrective Action
Malfunction
Probable Cause
d. Tighten cover capscrews o r
d. Air leaks in carburetor gaskets.
replace gaskets in carburetor
e. open.
e. Partially closed fuel shutoff valve.
f. Let water settle to, bottom and
f. W ater and sediment in carburetor.
drain. Drain out sediment. and
clean screens. Check source of
supply,
g. (Check line: remove obstruction
g. Fuel lines partially blocked.
and any kinks in tubing.
h. Tighten.
h. Loose ground cable.
i. Remove the carburetor and tighten
i. Loose jets in the carburetor.
a. Tap carburetor lightly with
a. Carburetor float sticking. (Black
9. Smoky exhaust.
hammer handle. If this does not
smoke.)
correct the situation. carburetor
must be cleaned.
b. Replace rings and cylinder liners
b. W orn piston rings, and out-of-
round and tapered cylinders.
( Blue smoke.)
c. Use oil of correct viscosity. Refer
c. Thin lubrication oil. (Blue smoke.)
to the lubrication order LO 10-
3930-624-12.
d.
Oil level too high.
Commutator dirty.
a.
10. Ammeter does not register.
b.
W orn brushes.
a. Repair.
a.
Broken external connection.
11. Alternator does not generate
current.
b.
Shorted armature.
c.
Shorted field.
Caution: Do not attempt
to polarize alternator.
a. Broken connection.
12. Starting motor failure.
b. Clean with 00 sandpaper: do not
b. Commutator dirty.
use emery cloth (para 5-3).
c. W orn brushes.
d. Bad teeth on flywheel.
a. Check the fuel lines between the
a. Clogged fuel suction line.
13. No gasoline at the carburetor.
tank and the fuel pump and the
carburetor.
b. Tap the carburetor bowl gently.
b. Float stuck (dirty needle valve).
Or remove the carburetor, and
clean the needle valve and float
chamber (para 3-2).
c. (Check all connections and fuel
c. Air leak.
lines between the carburetor. fuel
pump and tank.
Adjust (para 3-3).
Surge screw out of adjustment
14. Engine surges.
(governor).
a. Tap carburetor gently to dislodge
a. Float stuck (dirty needle valve).
15. Carburetor leaks gasoline when
the dirt in the fuel valve. if this
idling.
does not correct the condition.
remove the carburetor and clean
the valve (para 3-2).
b. Tighten.
b. Drain plug not tight.
a. Repair radiator. Do not use liquid
a. Leaky radiator.
16. Radiator boils.
solder. because it tends to clog the
system.
b. Tighten clamp or replace hose.
b. Faulty hose connections.
c. Replace hose.
c. internal collapse of suction hose at
water pump.
d. Use a solvent to remove: flush and
d. Dirt. rust. scales. and sediment in
drain entire system.
the water jacket.
2-3
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