TM 5-3740-214-14
Table 4-3. Troubleshooting Chart (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE BACKFIRES (Continued)
b. Turn main fuel needle valve back to the left (counterclockwise) until the engine slows down.
c.
Turn the needle valve back to a point halfway between the slow down points.
(1)
If engine stops backfiring the problem is solved.
(2)
If engine continues to backfire, notify your supervisor.
9. NOZZLE PRESSURE BELOW 90 PSI
Step 1.
Turn engine ON and listen to compressor.
a. If compressor runs smoothly, go to Step 2.
b. If compressor makes grinding, rubbing or rattling noises, go to Step 1c.
Figure 4-64. Compressor Dipstick
c.
Check oil level.
(1)
If oil level is near the full (F) mark, go to Step 2.
CAUTION
DO NOT overfill the crankcase. The oil level must be kept between the full (F) and low (L) marks
on the dipstick.
(2)
If oil level is below the low (L) mark, add oil. Use synthetic compressor oil: refer to page 1-6
for correct oil. Go to Step 2.
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