| Worn accessory drive components (abnormalities such as severe cracking, bumps or missing areas in the accessory drive belt and/or misalignment of the system components.) |
- Inspect the accessory drive components.
- Repair or replace all damaged components.
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| Low oil pressure |
Insufficient or poor oil supply to crankshaft and connecting rod bearings.
- Perform oil pressure test.
- Repair or replace all damaged components.
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| Leaking and/or sticking fuel injection nozzle (A stuck fuel injection nozzle can cause a noise similar to a damaged piston, rod or rod bearing.) |
- Inspect the cylinder balance with scan tool to help locate the cylinder that is the source of the noise.
- If you cannot locate the cylinder that is the source of the noise, diagnose the engine for mechanical damage.
- If it has been determined that the fuel injection nozzle is causing the noise, replace the fuel injection nozzle.
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| Loose and/or damaged crankshaft pulley |
- Inspect crankshaft pulley and pulley bolt.
- Repair or replace all damaged components.
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| Loose torque converter bolts |
- Inspect torque converter bolts and flywheel.
- Repair or replace all damaged components.
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| Loose and/or damaged flywheel |
- Inspect flywheel and flywheel attaching bolts.
- Repair or replace all damaged components.
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| Excessive piston pin-to-bore clearance |
- Inspect the piston, piston pin and the connecting rod.
- Repair or replace all damaged components.
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| Misaligned or bent connecting rod |
- Inspect connecting rod and connecting rod bearings.
- Repair or replace all damaged components.
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| Excessive connecting rod bearing clearance |
- Inspect the connecting rod bearings, connecting rods, crankshaft and crankshaft journals.
- Repair or replace all damaged components.
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| Excessive crankshaft bearing clearance |
- Inspect the crankshaft bearings and crankshaft journals.
- Repair or replace all damaged components.
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