TM 5-4310-376-14
Table 4-2. Organizational Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
b. If spark plug is dry, pour a small amount of gasoline through spark plug hole
and replace spark plug. Pull starter. If engine fires a few times and then
quits, look for:
(1) Leaking carburetor. If a .002" feeler gage can be inserted between upper
and lower bodies at the air vent boss, just below idle valve, upper body is
warped or gasket is damaged.
Replace carburetor (para 4-28).
(2) Inlet valve (4) stuck shut.
Replace carburetor (para 4-28).
(3) Fuel pump defective.
Replace fuel pump (para 4-27).
2. ENGINE MISSES OR RUNS ERRATICALLY.
Step 1. In-line fuel filter clogged.
Replace in-line fuel filter (para 4-24).
Step 2. Check that ignition cable firmly seats on spark plug.
Tighten or replace armature (para 4-31).
Step 3. Check spark plug in accordance with table 4-1.
Clean, adjust, or replace spark plug.
Step 4. Check to see engine is not overloaded by unloading control valve. With
engine running, pull up on unloading control valve safety valve. Observe
if engine performance improves.
Check air inlet tube for obstructions. Replace air inlet tube (para
Step 5. Check engine acceleration, place governor speed control in "fast" position.
If engine will not accelerate properly, adjust carburetor.
Step 6. Check ignition timing (armature adjustment) in accordance with
MALFUNCTION 1, step 3a.
Adjust armature as instructed.
4-19
