HIGH CRANKCASE PRESSURE.

TM 9-2815-224-34&P

Troubleshooting Malfunctions (Cont)

Tab/e 2-3. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ENGINE SYSTEM (CONT)

HIGH OIL CONSUMPTION (CONT).

Check crankcase pressure. Place manometer (J7333-6) on vehicle so that meter is visible

Step 9.

during test. Remove oil dipstick and place hose (J8639-2) of manometer at dipstick tube.

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

zero is placed along top position 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. t

2100 rpm.

If crankcase pressure is high, refer to Malfunction 8.HIGH CRANKCASE PRESSURE

8. HIGH CRANKCASE PRESSURE.

Check for head gasket leaks by performing engine compression check (para 19-11).

Step 1.

Replace leaking gaskets (para 3-7).

Check for damaged or broken piston rings and pistons or liners (para 6-2).

Step 2.

Replace damaged or broken piston rings, pistons, or liners (para 6-2).

Check for damaged blower-to-block gasket (para 14-3).

Step 3.

Replace damaged gasket (para 14-3).

Check for damaged cylinder block and plate gaskets (para 3-3 or 3-4).

Step 4.

Replace damaged gasket (para 3-3 or 3-4).

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