TM 5-3810-306-34
TABLE 3-1. DIRECT AND GENERAL SUPPORT TROUBLESHOOTING (CONTD)
Malfunction
Test or Inspection
Corrective Action
7. LOW LUBRICATING OIL PRESSURE
Step 1.
Oil diluted with fuel accompanied by rough engine
operation or low power.
a. Remove and check for stuck fuel injector nozzle.
(Refer to page 5-2.) If OK, replace fuel injection
pump. (Refer to page 5-4.)
b. Replace defective fuel injector.
Step 2.
Oil diluted with coolant.
a. Check core plugs, cylinder liner, head gasket, and
cracked passages in block and head for leaks. If OK,
do Step 3.
b. Replace defective engine component. Change engine
lubrication oil.
Step 3.
Oil pressure regulating valve stuck open or broken spring.
a. Remove and inspect oil pressure regulating valve.
(Refer to page 4-62.) If OK, do Step 4.
b. Clean or replace oil pressure regulating valve.
Step 4.
Internal leak from oil rifle cup plug.
a. Check oil rifle cup plugs, cup plug in front and rear
face of block. If OK, do Step 5.
b. Replace oil rifle cup plugs.
Step 5.
Oil pump suction tube loose or seal leaking.
a. Inspect oil pump suction tube. If OK, do Step 6.
b. Replace seal and tighten oil pump suction tube.
(Refer to page 4-57.)
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