C1.5 and C2.2 Engines for Caterpillar Built Machines Caterpillar

Refer to Systems Operation, Testing, and Adjusting for additional information on determining the cause of this condition.

Probable Causes

• Vibration damper

• Engine supports

• Low compression (cylinder pressure)

Recommended Actions

Vibration Damper

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".

Engine Supports

1. Check for any of the following conditions:

   • Loose engine supports

   • Loose mounting brackets or broken mounting brackets

   • Loose bolts

   • Omitted bolts

2. 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)

1. Perform a compression test. Refer to Systems Operation, Testing, and Adjusting, "Compression - Test ".

2. 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

3. Perform all necessary repairs.

4. Ensure that the repairs have eliminated the fault.

5. If the repair does not eliminate the fault, contact the Technical Communicator at a Cat®dealer.