TM-5-4310-389-14
Table 5-1. General Support Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
COMPRESSOR (Contd)
4.
Compressor air delivery is insufficient (Contd).
Step 4.
Check to see if final pressure rises only to operating pressure of prefinal safety valve.
Examine free floating piston of final stage and replace, as required.
ENGINE
5.
Engine fails or difficult to start.
Step 1.
Check to see if fuel feed pump diaphragm is defective.
Disassemble and replace diaphragm.
Step 2.
Check to see if commencement of delivery setting is incorrect.
Adjust valve timing.
Step 3.
Check to see if compression pressure is too low.
Replace valves, piston rings, or cylinder, as required.
Step 4.
Check to see if cylinders and/or piston rings are worn.
Replace, as required.
Step 5.
Check to see if the piston crown clearance is excessive.
Adjust as needed.
6.
Temperature shutdown activates warning.
Step 1.
Check to see if fuel delivery timing is incorrect.
Adjust timing.
Step 2.
Check to see if amount of fuel injected is excessive.
Adjust timing.
7.
Engine gives poor performance.
Step 1.
Check to see if commencement of delivery setting is incorrect.
Adjust timing.
Step 2.
Check to see if compression pressure is too low.
Replace or adjust valves, piston rings, or cylinder liner.
Step 3.
Check to see if cylinders and/or piston rings are worn.
Replace cylinder or piston rings.
Step 4.
Check to see if piston crown clearance is excessive.
Adjust clearance.
5-2
