TM 5-4320-302-14
6-2. SYMPTOM INDEX
Refer to the Symptom Index below. Locate the malfunction which is the same, or most nearly the same, as the trouble
you are having with the centrifugal pump unit. The Symptom Index lists the first page of troubleshooting information for
that malfunction. Follow the steps one by one, and perform the corrective actions listed.
Malfunction
Number
Description
Page
1
Engine is hard to start
6-3
2
Engine consumes excessive lube oil (may produce blue smoke)
6-3
3
Engine produces excessive crankcase pressure
6-4
4
Engine has low oil pressure
6-4
Table 6-1. General Support Maintenance Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
ENGINE IS HARD TO START
Step 1.
Check for sticking or burned exhaust valves. Inspect valves (para 6-9).
Repair or replace faulty valves (para 6-9).
Step 2.
Check for broken or worn piston rings. Inspect pistons and rings (para 6-16).
Inspect cylinder head assembly (para 6-8).
Repair or replace pistons (para 6-16) and cylinder head assembly (para 6-8).
Replace piston rings (para 6-16).
Step 3.
Check for improper exhaust valve clearance.
a.
Wipe off rocker chamber cover.
Remove hex bolt, cover, and
gasket. Discard gasket.
b.
Check and adjust exhaust valve clearance (para 6-9).
2.
ENGINE CONSUMES EXCESSIVE LUBE OIL (MAY PRODUCE BLUE SMOKE)
Step 1.
Check for worn or broken oil control rings. Inspect pistons and rings (para 6-16).
Inspect cylinder head assembly (para 6-8).
Repair or replace faulty pistons (para 6-16) and cylinder head assembly
(para 6-8). Replace piston rings (para 6-16).
6-2
