Table 5-2. Direct Support Troubleshooting
TEST OR INSPECTION
AUXILIARY POWER UNIT
APU ENGINE LOW POWER
Step 1. Check governor adjustment and linkage.
Adjust governor and/or replace linkage (see para 5-79).
Step 2. Check engine adjustments.
Check valve adjustment (see para 5-80), decompression release adjustment (see
para 5-73), injector opening pressure adjustment (see para 5-77), and injection pump
adjustment (see para 5-78).
Step 3. Test compression with gauge.
If compression is below 350 - 400 psi (2415 - 2760 kPa) at 1800 rpm, refinish or replace
valves and seats (see para 5-72), and/or replace piston rings (see para 5-74).
Step 4. Governor worn or damaged:
Repair governor (see para 5-79).
WATER PUMP AND PIPING
PUMP WILL NOT ENGAGE
Step 1. Check pump switch and shift linkage.
Step 2. Check power and ground connections at transmission lock up solenoids.
PUMP CASING LEAKS WATER WHILE PUMPING
Step 1. Check location of leak.
Repair pump as required (see para 6-6).
OIL IN RADIATOR COOLANT
Sample radiator coolant and determine whether oil is from engine or transmission.
Overhaul engine or transmission as required (see Chapter 6).