TM-5-4310-389-14
Table 3-2. Unit Troubleshooting Procedures (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ENGINE (Contd)
26.
Engine does not run smoothly.
Step 1. Check to see if engine suspension is defective or incorrect. Notify Direct Support
Maintenance. Replace or adjust engine vibration mounts.
Step 2. Check to see if there is air in the fuel system. Air bleed the fuel system. Refer to Direct
Support Maintenance.
Step 3. Check to see if fuel return line is clogged. Flush return line.
27. Engine overheats or backfires.
Step 1. Check to see if crankcase oil level is too low. Fill to proper level.
Step 2. Check to see if belts are slipping on engine cooling fan. Adjust.
Step 3. Check to see if fuel in tank is of poor grade. Drain. Replace.
Step 4. Check to see if cooling fins are dirty. Clean. Notify Direct Support Maintenance.
NOTE
When engine stops suddenly with compressor engaged and safety bypass off, engine can be shut
down by low compressor oil pressure or compressor 4th stage head temperature.
28.
Engine stops suddenly.
Step 1. Check to see if fuel tank is empty. Add fuel as required.
Step 2. Check crankcase oil level. Add oil, as required.
Step 3. Check cylinder head temperature gauge. Let engine cool. Check cooling fins.
Step 4. Restart engine and check oil pressure. If low, notify Direct Support Maintenance.
29.
Battery undercharged (ammeter indicates constant discharge).
Step 1. Inspect for defective cables, dirty or corroded battery posts and terminals. Clean or replace
as necessary.
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