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CONDITION POSSIBLE CAUSES CORRECTION MAIN BEARING NOISE 1. Insufficient oil supply 1. Check engine oil level. 2. Low oil pressure 2. Check engine oil level. If ok, 3. Thin or diluted oil 3. Change oil to correct viscosity. 4. Excessive main bearing 4. Measure bearings for correct 5. Excessive end play 5. Check crankshaft thrust bearing 6. Crankshaft main journal out of 6. Grind journals or replace 7. Loose flywheel or torque 7. Inspect crankshaft, flexplate/ LOW OIL PRESSURE 1. Low oil level 1. Check oil level and fill if 2. Faulty oil pressure sending unit 2. Install new sending unit 3. Clogged oil filter 3. Install new oil filter 4. Worn oil pump 4. Replace oil pump assembly. 5. Thin or diluted oil 5. Change oil to correct viscosity. 6. Excessive bearing clearance 6. Measure bearings for correct 7. Oil pump relief valve stuck 7. Remove valve to inspect, clean 8. Oil pickup tube loose, broken, 8. Inspect oil pickup tube and pump, 9. Oil pump cover warped or 9. Install new oil pump OIL LEAKS 1. Misaligned or deteriorated 1. Replace gasket 2. Loose fastener, broken or porous 2. Tighten, repair or replace the part 3. Front or rear crankshaft oil seal 3. Replace seal 4. Leaking oil gallery plug or cup 4. Remove and reseal threaded TJ ENGINE 4.0L 9 - 75 ENGINE 4.0L (Continued) |