Table 4-3. Troubleshooting Chart (Continued)
TEST OR INSPECTION
ENGINE BACKFIRES (Continued)
b. Turn main fuel needle valve back to the left (counterclockwise) until the engine slows down.
Turn the needle valve back to a point halfway between the slow down points.
If engine stops backfiring the problem is solved.
If engine continues to backfire, notify your supervisor.
9. NOZZLE PRESSURE BELOW 90 PSI
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
Check oil level.
If oil level is near the full (F) mark, go to Step 2.
DO NOT overfill the crankcase. The oil level must be kept between the full (F) and low (L) marks
on the dipstick.
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.