ENGINE-continued -714670037

TM 5-2420-224-34

Table 2-1. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ENGINE (CONT)

Repeat steps d thru f for remaining cylinders. If minimum compression

reading is not 284 psi (20 bar), squirt approximately 1 oz engine oil into

cylinder. Crank engine several times and repeat steps d thru f for each

cylinder.

If compression reading is higher after second test, on any

cylinder, excessive bypass of air between piston and cylinder

bore is indicated. Replace piston rings (page 13-31).

If compression reading remains approximately the same after

second test, replace valves and valve guides (page 13-2).

If variation between cylinders exceeds 21.3 psi (1.47 bar),

replace piston rings (page 13-31).

Step 3. Check fuel injection pump timing (page 3-50).

If timing is correct and problem persists, replace fuel injection

If timing is not correct, time fuel injection pump (page 3-50).

2. ENGINE RUNS ROUGH OR LACKS POWER.

Step 1. Check fuel injection pump timing (page 3-50).

if timing is correct and problem persists, replace fuel injection

If timing is not correct, time fuel injection pump (page 3-50).

Step 2. Remove fuel injector nozzles. Check for blocked fuel injector spray holes by

performing fuel injector spray pattern test (page 13-65).

Repair fuel injector nozzle(s) (page 13-65).

Step 3. Perform Malfunction 1, step 2.

3. FUEL CONSUMPTION EXCESSIVE.

Check fuel injection pump timing (page 3-50).

If timing is correct and problem persists, replace fuel injection

If timing is not correct, time fuel injection pump (page 3-50).

4. ENGINE OIL PRESSURE LOW.

Step 1. Check for blocked oil suction tube on engine oil pump (page 13-60).

Clean oil suction tube, or replace if required (page 13-60).

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