Table 3-1. Direct Support Troubleshooting
TEST OR INSPECTION
4. ENGINE CONSUMES EXCESSIVE LUBE OIL (MAY PRO DUCE BLUE SMOKE)
Step 1. Check for leaking oil pan.
If oil pan is leaking, remove from crankcase, replace gasket and install (para 3-38).
If oil pan continues to leak, replace it (para 3-38).
Step 2. Check for lube oil cooler leaks. Clean lube oil cooler and check for leaks.
If lube oil cooler leaks, remove and install with new gasket. If leakage continues, replace lube oil cooler
Step 3. Check for leaking head gasket:
Inspect engine oil for evidence of engine coolant.
Inspect engine coolant for evidence of engine oil. Replace cylinder head or gasket as required (para
5. ENGINE OIL PRESSURE IS LOW
Step 1. Check for clogged lube oil cooler. Inspect lube oil cooler.
Replace a clogged or otherwise faulty lube oil cooler (para 3-32).
Step 2. Check for partially clogged oil suction pipe.
Replace an oil suction pipe that is damaged or cannot be cleaned adequately (para 3-38).
Step 3. Check for air leak in oil suction pipe. Inspect oil suction pipe.
Replace a faulty oil suction pipe (para 3-38).
Step 4. Check for worn or damaged lube oil pump. Inspect lube oil pump.
Repair or replace a faulty lube oil pump (para 3-31).
6. PUMP DOES NOT DISCHARGE OR HAS LOW DISCHARGE PRESSURE
Step 1. Check for malfunctioning pressure regulator.
Replace faulty pressure regulator (para 3-15).
Step 2. Check for broken impeller. Disassemble pump (para 3-8). Inspect impeller.
Replace impeller if necessary (para 3-8).
7. PUMP MAKES EXCESSIVE NOISE
Step 1. Check flexible coupling.
Tighten, adjust, or replace as necessary (para 3-7).
Step 2. Check for foreign matter in pump. Disassemble pump (para 3-8). Inspect for foreign matter.
Remove foreign matter.
Step 3. Check bearing assembly. Disassemble pump (para 3-8).
Replace bearing if necessary (para 3-8).