Engine Vibration Is Excessive
Refer to Systems Operation, Testing, and Adjusting for additional information on determining the cause of this condition.
- Vibration damper
- Engine supports
- Low compression (cylinder pressure)
Check the vibration damper for damage. If necessary, install a new vibration damper. Inspect the mounting bolts for damage and/or for wear. Replace any damaged bolts. Refer to Disassembly and Assembly, "Vibration Damper and Pulley - Remove" and Disassembly and Assembly, "Vibration Damper and Pulley - Install".
Ensure that the repairs have eliminated the fault. If the vibration is still present, proceed to "Engine Supports".
- Check for any of the following conditions:
- Loose engine supports
- Loose mounting brackets or broken mounting brackets
- Loose bolts
- Omitted bolts
- Make all necessary repairs. Ensure that the repairs have eliminated the fault. If the vibration is still present, proceed to "Low Compression (Cylinder Pressure)".
Low Compression (Cylinder Pressure)
- Perform a compression test. Refer to Systems Operation, Testing, and Adjusting, "Compression - Test ".
- If low compression is noted on any cylinders, investigate the cause and rectify the cause.
Possible causes of low compression are shown in the following list:
- Loose glow plugs
- Faulty piston
- Faulty piston rings
- Worn cylinder bores
- Worn valves
- Faulty cylinder head gasket
- Damaged cylinder head
- Perform all necessary repairs.
- Ensure that the repairs have eliminated the fault.
- If the repair does not eliminate the fault, contact the Technical Communicator at a Cat®dealer.
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