Oil Pressure Switch Faulty.
· DO NOT service cooling system unless engine has been allowed to cool down.
This is a pressurized cooling system and escaping steam or hot coolant may
· DO NOT remove cooling system radiator cap when engine is hot. Allow engine
to cool down. Loosen cap to first stop and let any pressure out of cooling
system, then remove cap. Failure to follow this warning may cause burns.
· Wear effective eye, glove, and skin protection when handling coolants. Failure
to do so may cause injury.
Remove engine oil pressure switch from elbow (WP 0172).
Attach pressure gauge to elbow.
Start engine and allow engine to warm up.
Engine oil pressure should be between 13-40 psi (90-276 kPa).
Turn engine start switch to OFF position (TM 5-3895-379-10).
Remove pressure gauge.
If oil pressure is not between 13-40 psi (90-276 kPa), perform the following:
Install engine oil pressure switch on elbow (WP 0172).
Tighten switch to 15-18 lb-ft (20-25 N·m) and go to next malfunction.
If oil pressure is between 13-40 psi (90-276 kPa), replace engine oil pressure switch