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CONDITION POSSIBLE CAUSES CORRECTION CONNECTING ROD NOISE 1. Insufficient oil supply. 1. Check engine oil level. 2. Low oil pressure. 2. Check engine oil level. If OK, perform 3. Thin or diluted oil. 3. Change oil and filter. 4. Excessive bearing clearance. 4. Measure bearings for correct clearance. 5. Connecting rod journal out-of- 5. Replace crankshaft or grind journals. 6. Misaligned connecting rods. 6. Replace bent connecting rods. MAIN BEARING NOISE 1. Insufficient oil supply. 1. Check engine oil level. 2. Low oil pressure. 2. Check engine oil level. If OK, perform 3. Thin or diluted oil. 3. Change oil and filter. 4. Excessive bearing clearance. 4. Measure bearings for correct clearance. 5. Excessive end play. 5. Check No. 3 bearing for wear on 6. Crankshaft journal out-of-round 6. Grind journals or replace crankshaft. 7. Loose flywheel. 7. Inspect crankshaft, flywheel, and bolts OIL PRESSURE DROP 1. Low oil level. 1. Check oil level and fill if necessary. 2. Faulty oil pressure sending unit. 2. Replace sending unit. 3. Clogged oil filter. 3. Install new oil filter. 4. Worn oil pump. 4. Replace worn gears or oil pump assem- 5. Thin or diluted oil. 5. Change oil to correct viscosity. 6. Excessive bearing clearance. 6. Measure bearings for correct clearance. 7. Oil pump relief valve stuck. 7. Remove relief valve. Inspect valve and 8. Oil pump pick up tube restricted, 8. Remove oil pan and inspect oil pump 9. Oil pump cover loose, warped, or 9. Inspect/tighten cover screws or install 9 - 6 ENGINE ZB ENGINE - 8.3L (Continued) |