HIGH OIL CONSUMPTION.

TM 9-2320-279-20-l

Troubleshooting Malfunctions (Cont)

2-15. TROUBLESHOOTING INSTRUCTIONS (CONT).

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ENGINE (CONT)

4. OVERHEATS (CONT).

Check thermostats. Remove thermostats (para 6-8 or 6-9).

Step 9.

Test thermostats (TM 750-254).

Replace defective thermostat (para 6-8 or 6-9).

Step 10.

If still overheating, notify the supervisor.

5. HIGH OIL CONSUMPTION.

NOTE

If engine uses less than 10 qt (9 L) of oil in 1000 mi (1 609 K) of operation, oil consumption

is normal.

Step 1.

Check oil filter, oil lines, engine covers, and oil pan for oil leaks,

Tighten leaking connections and covers and tighten or replace oil filter as necessary

(para 3-4). Add oil as required (LO 9-2320-279-12).

Step 2.

Check water temperature gage for engine overheating.

If engine is overheating, refer to MALFUNCTION 4, OVERHEATS.

Step 3.

If high oil consumption continues, notify the supervisor.

Step 4.

Check crankcase pressure. Place manometer (57333-6) on vehicle so that meter is visible

during test. Remove oil dipstick and place hose (58639-2) of manometer at dipstick tube.

Open bleeder valve on manometer to level out manometer fluid. Adjust manometer so that

zero is placed along top portion of fluid line. Start engine and check crankcase pressure.

Crankcase pressure shall be 3.1 in. of water at 1800 rpm, 3.3 in. at 1950 rpm, and 3.5 in. at

2100 rpm.

If crankcase pressure is high, refer to MALFUNCTION 5.1 HIGH CRANKCASE

PRESSURE.

5.1. HIGH CRANKCASE PRESSURE,

Check engine oil breather for clogged element, obstruction, or damage (para 3-3).

Step 1.

Replace oil breather element, remove obstruction, or replace damaged parts

Step 2.

Check muffler and exhaust system for obstruction or damage (para 5-2).

Remove obstruction or replace damaged part (para 5-2).

Change 3