Engine Misfires or Runs Rough

TM 5-2410-233-23

TROUBLESHOOTING PROCEDURES - CONTINUED

0006 00

Table 1. Engine Troubleshooting Procedures - Continued.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. Check service indicator and Clean air inlet and service air

Engine Misfires or Runs Rough.

air cleaner for air restriction. cleaner filter elements (WP 0042

00).

a. Remove primary fuel filter 1. Drain fuel system.

case. If case is 1/4 full of 2. Replace fuel filters (WP 0055

00 and 0056 00).

water or if dirt is evident,

3. Fill fuel tank with correct fuel

fuel is contaminated.

(TM 5-2410-233-10).

4. Prime fuel system (WP 0038

00).

b. Disconnect fuel lines 1. Clean lines with compressed

air or sturdy wire. Reconnect

between tank shutoff valve

fuel lines (WP 0050 00).

and primary fuel filter (WP

0050 00) and check for 2. Replace fuel filters (WP 0055

00 and 0056 00).

clogs and obstructions.

3. Prime fuel system (WP 0038

00).

2. Check fuel pressure gauge If indicator is in the red, replace

indicator.).

fuel filters (WP 0055 00 and WP

0056 00).

3. Inspect fuel lines and 1. If leak is at a connection,

connections

for

leaks,

tighten connection.

obstructions and damage.

2. Replace damaged fuel lines

(WP 0050 00).

4. Check fuel injection lines for Bleed air from fuel injection lines

air.

(WP 0038 00).

5. Check valve clearance.

Adjust valve clearance (WP 0017

00).

6. Check fuel injection timing Adjust timing (WP 0053 00).

(WP 0053 00).

7. Perform cylinder cutout test 1. Replace nozzle for suspect

(WP 0040 00).

cylinder (WP 0037 00).

2. Replace fuel injection pump

(WP 0051 00).

8. Check for worn, bent or Replace push rod(s) (WP 0017

broken push rod (WP 0017 00).

00).

9. Remove cylinder head and Replace damaged valve lifters

inspect valve lifters (WP 0023 (WP 0030 00).

00).

0006 00-3