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CONDITION POSSIBLE CAUSES CORRECTION LUBRICATING OIL LOSS 6. Turbocharger leaking oil to the 6. Inspect the air ducts for evidence of oil 7. Piston rings not sealing (oil 7. Perform blow-by check. Repair as COMPRESSION KNOCKS 1. Poor quality fuel or water/ 1. Verify by operating from a temporary tank 2. Incorrect injection pump timing. 2. Check and time injection pump (refer to 3. Improperly operating injectors. 3. Check and replace inoperative injectors. 4. Wrong injection pump timing. 4. Check injection pump timing. EXCESSIVE VIBRATION 1. Loose or broken engine 1. Replace engine mounts. 2. Damaged fan or improperly 2. Check and replace the vibrating 3. Improperly operating vibration 3. Inspect/replace the vibration damper. 4. Improperly operating viscous 4. Inspect/replace the fan drive. 5. Worn or damaged generator 5. Check/replace the generator. 6. Flywheel housing misaligned. 6. Check/correct flywheel alignment. 7. Loose or broken power 7. Inspect the crankshaft and rods for 8. Worn or unbalanced driveline 8. Check/repair driveline components. EXCESSIVE ENGINE 1. Drive belt squeal, insufficient 1. Check the automatic tensioner and 2. Intake air or exhaust leaks. 2. Refer to Excessive Exhaust smoke 3. Turbocharger noise. 3. Check turbocharger impeller and turbine 4. Gear train noise. 4. Visually inspect and measure gear 5. Power function knock. 5. Check/replace rod and main bearings. GENERATOR NOT 1. Loose or corroded battery. 1. Clean/tighten battery connection. 2. Generator belt slipping. 2. Check/replace automatic abelt tensioner. 3. Generator pulley loose on shaft. 3. Tighten pulley 4. Improperly operating generator. 4. Check/replace generator. 9 - 10 ENGINE WJ DIAGNOSIS AND TESTING (Continued) 2000 JEEP GRAND CHEROKEE |