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TM 5-4210-220-12
Table 4-2 UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3b
APU ENGINE CRANKS NORMALLY BUT WILL NOT START - Continued
Step 3
Broken fuel line or blocked fuel filter.
Check for leakage/blockage. Replace/repair as required.
Step 4
Failed fuel pump.
Replace fuel pump.
Step 5
Air filter blocked.
Replace air filter element, (see para. 4-15).
Step 6
Engine very cold.
Use starting aid.
Step 7
Low engine compression.
a
Exhaust valves sticking or burned - replace, (see para. 4-15).
b
Compression wings burned or broken - replace, (see para. 4-15).
c
Cylinder head gasket leaking - replace, (see para. 4-15).
3c
APU ENGINE CRANKS SLOWLY
Step 1
Sample lubricating oil.
Change lubricating oil to correct viscosity.
Step 2
Loose or corroded starter motor or battery terminals.
Tighten, clean, or replace terminals.
Step 3
Batteries not fully charged.
Charge or replace batteries.
Step 4
Low ambient temperature.
Operate ether start system.
Step 5
Starter/starter solenoid failed.
Replace starter, (see para. 4-15).
4-26
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