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ENGINE DIAGNOSIS—MECHANICAL CONDITION POSSIBLE CAUSES CORRECTION NOISY VALVES 1. High or low oil level in 1. Check and correct engine oil 2. Thin or diluted oil. 2. Change oil to correct viscosity. 3. Low oil pressure. 3. Check and correct engine oil 4. Dirt in tappets/lash adjusters. 4. Replace rocker arm/hydraulic 5. Worn rocker arms. 5. Inspect oil supply to rocker arms. 6. Worn tappets/lash adjusters. 6. Install new rocker arm/hydraulic 7. Worn valve guides. 7. Ream guides and install new 8. Excessive runout of valve seats 8. Grind valve seats and valves. 9. Missing adjuster pivot. 9. Replace rocker arm/hydraulic CONNECTING ROD NOISE 1. Insufficient oil supply. 1. Check engine oil level. 2. Low oil pressure. 2. Check engine oil level. Inspect oil 3. Thin or diluted oil. 3. Change oil to correct viscosity. 4. Excessive bearing clearance. 4. Measure bearings for correct 5. Connecting rod journal 5. Replace crankshaft or grind 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. Inspect oil 3. Thin or diluted oil. 3. Change oil to correct viscosity. 4. Excessive bearing clearance. 4. Measure bearings for correct 5. Excessive end play. 5. Check thrust bearing for wear on 6. Crankshaft journal out-of-round 6. Replace crankshaft or grind 7. Loose flywheel or torque 7. Tighten to correct torque. JX 2.0L SOHC ENGINE 9 - 9 DIAGNOSIS AND TESTING (Continued) |