Unit Mechanical Troubleshooting - continued

TM 9-2320-386-24-1-1

0010 00

Unit Mechanical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

10. EXCESSIVE ENGINE OIL LOSS OR CONSUMPTION DURING NORMAL OPERATION

Step 1. Check oil for overfilling. Check oil level (TM 9-2320-386-10).

If oil level is too high, drain crankcase to safe operating level (WP 0023 00). Recheck oil

level (TM 9-2320-386-10).

Step 2. Check for external oil leaks at oil pan, drainplug, oil filter, oil filter housing, oil cooler,

oil dipstick tube, rocker arm cover, and oil feed lines.

Tighten any loose connections or loose screws. If leaking continues, replace defective

component or notify direct support maintenance.

END OF TESTING!

11. ENGINE OIL PRESSURE TOO LOW OR TOO HIGH AT NORMAL OPERATING TEMPERATURE

CAUTION

Do not operate engine except during testing. If no oil pressure is evident,

continued operations may damage engine internally.

Step 1. Check engine oil level (TM 9-2320-386-10).

a. If level is low, check for external oil leaks at oil pan, drainplug, oil filter, oil filter

housing, oil cooler, oil dipstick tube, and rocker arm cover.

b. Tighten any loose connections or loose screws that may cause leaks.

Step 2. Check engine for excessive engine operating temperature (malfunction 19).

Step 3. Check oil pressure gauge for proper operation.

a. Check operation of oil pressure gauge (Electrical Troubleshooting, WP 0011 00).

b. Check oil pressure. Oil pressure should be 35-70 psi (241-483 kPa).

c. If oil pressure is still too high or too low, notify direct support maintenance.

Step 4. Check that engine oil grade is correct for vehicle use and climate conditions (WP 0023 00).

Replace engine oil if grade is incorrect (WP 0023 00).

Step 5. Check all external oil lines for restrictions or leakage.

Clear restrictions or repair leaks.

Step 6. Check for fuel in oil.

If fuel is present, notify direct support maintenance.

Step 7. Check for clogged or dirty oil filter.

Replace oil filter if clogged or dirty (WP 0033 00).

END OF TESTING!

12. EXCESSIVE VIBRATION OR CLUNKING

Step 1. Check engine mounting brackets and pads for looseness or damage.

a. Tighten if loose.

b. Replace front engine mounting pad(s) if damaged (WP 0027 00) and notify direct support

maintenance to replace rear mounting pads.

Step 2. Check vibration damper for looseness.

Notify direct support maintenance if vibration damper is loose.

END OF TESTING!