FOG OIL PUMP FAILS TO PUMP FOG OIL.

TM 3-1040-276-23

TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

5. FOG OIL PUMP FAILS TO PUMP FOG OIL.

Step 1. Fog oil inlet hose has loose connections, breaks, or missing, clogged, or torn fog oil strainer.

Repair fog oil inlet hose (p 2-60).

WARNING

Fog oil pump may become very hot during operation. Make sure fog oil pump air motor is cool before

checking for stuck rocker arms, pump rod assembly, or tappet valves to avoid injury.

Step 2. Rocker arms, pump rod assembly, or tappet valves are stuck.

Remove M4 fog oil pump (p 2-26) and repair (p 2-66.7).

Step 3. Oil check valve stuck.

Replace check valve (p 2-63).

Step 4. Test for faulty air check valve assembly disc valve (malfunction 4, step 1).

If valve won't open or close, repair (p 2-66.21).

Step 5. Air motor overloaded with oil.

Press boots on safety release valves and drain oil (p 2-27).

Step 6. Fog oil pump internal moving parts stuck or binding.

Remove fog oil pump (p 2-26) and repair (p 2-66.7).

Step 7. Fog oil line clogged or oil metering globe valve stuck.

Report on DA Form 2404 to your supervisor.

Step 8. Engine gases leaking past engine head gasket.

Check for carbon deposits on gasket. Replace gasket if necessary (p 2-48.1).

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