 |
|||
|
|
|||
|
|
|||
| ||||||||||
|
|
 Table 2-1. Troubleshooting (Continued)
Malfunction
Probable cause
Corrective action
a. Lower oil pressure, due to (1)
a. (1) Repair leaks by lightening the
5. Loss of power
external oil leaks, (2) thin oil or
connections, or replacing the
(3) sticking of oil pressure relief
line; (2) Drain and fill with fresh
valve.
oil; (3) Remove oil pressure relief
valve and clean (para 3-14). Do
not stretch spring.
b. Leaky valves.
b. If the leaky valve is caused by its
improper adjustment, adjust or
grind valve (para 3-23).
c. Worn piston rings
c. Replace rings (Para 3-22).
d. Blown cylinder head gasket
d. Replace cylinder head gasket
6. Explosion in exhaust
Partially open exhaust valve.
Remove gum from valve stem. or
adjust tappet clearance or replace
broken spring (para 3-23).
a. Warped exhaust valve.
a. Replace valve (para 3-23).
7. Engine runs irregularly (sputters)
b. Leaky valves.
b. Adjust tappet clearance regrind.
or replace (para 3-23).
c. Loose jets in the carburetor.
c. Remove carburetor and tighten
a. Carburetor float sticking (black
a. Tap carburetor lightly with
8. Smoky exhaust
smoke)
hammer handle. If this does not
correct the situation carburetor
must be cleaned (para 3-8).
b. Worn piston rings, and out-of-
b. Replace rings (para 3-22) and
round and tapered cylinders
cylinder sleeves (para 3-20).
(blue smoke)
c. Thin lubrication oil (blue smoke)
c. Use oil correct viscosity (LO 10-
3930-618-12).
9. Ammeter does not register
Slip-rings dirty.
Clean slip-rings (para 3-2).
a. Shorted rotor.
a. Replace or repair (para 3-2).
10. Alternator does not generate
b. Shorted stator.
b. Replace or repair (para 3-2).
current
a. Check ignition switch or magnetic
11. Starting motor failure
a. Faulty switches.
starting switch.
b. Commutator dirty.
b. Clean with No. 00 sandpaper; do
not use emery cloth (para 3-3).
c. Worn brushes.
c. Replace (para 3-3).
d. Bad teeth on flywheel.
d. Replace ring gear (para 3-26).
12. No gasoline at the carburetor
Float stuck (dirty needle valve).
Tap the carburetor bowl gently. or
remove the carburetor, and (lean
the needle valve and float
chamber (para 3-8).
a. Float stuck (dirty needle valve)
a. Tap carburetor gently to dislodge
13. Carburetor leaks gasoline when
idling.
dirt in fuel valve, or remove
carburetor and clean valve (para
b. Float level incorrect
b. Adjust (para 3-8).
c. Drain plug not tight.
c. Tighten (para 3-8).
a. Frozen radiator.
a. Run engine for 3 minutes with
14. Radiator boils.
blanket covering radiator. Stop
for 5 minutes. Run for 3 minutes
and stop for 5 minutes. Continue
this operation until radiator is
thawed. Check for leaks.
CAUTION: Do not run continuously)
to thaw. Water will boil away and
overheat seriously damaging
engine.
b. Leaky radiator.
b. Repair radiator. Do not use liquid
solder, as it tends to clog the
system (para 3-6).
a.
a. Tighten connections.
15. Unable to lift or tilt load.
Air leak at suction line.
b.
b. Remove and repair (para 4-2).
Damaged or worn pump.
c.
c. Remove and repair (para 4-3).
Relief valve binding open
d.
d. Check for binding or any cause to
Damaged lift cylinder.
make plunger inoperative(para 4-6)
2-2
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals