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 TM 9-2815-226-34-1
Table 2-1. TROUBLESHOOTING PROCEDURES (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
25.
HIGH OIL PRESSURE AT RATED ENGINE RPM (HIGHER THAN 45 PSI, [311 KPA]).
Step 1.
Check that proper oil viscosity is being used.
Drain and service oil system (LO 9-2320-281-12).
Step 2.
Check for stuck closed pressure regulator plunger.
Remove pump and replace regulator (para 3-51).
26.
NO OIL PRESSURE .
Step 1.
Check for broken oil pump drive shaft or gear turning on shaft.
Replace defective pump (para 3-6) and repair as necessary (para. 3-51).
Step 2.
Check for defective (stuck open) or weak spring in pump pressure regulator.
Remove pump and replace regulator (para 3-51).
27.
EXCESSIVE CRANKCASE PRESSURE .
Step 1.
Check for worn or scored liners or pistons.
Replace defective liners or pistons (para 3-6).
Step 2.
Check for broken or worn piston rings.
Replace defective rings (para 3-6).
2-24
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