C7 Industrial Engine Operation and Maintenance Manual – Crankshaft Vibration Damper – Inspect

Damage to the crankshaft vibration damper or failure of the crankshaft vibration damper can increase torsional vibrations. This can result in damage to the crankshaft and to other engine components. A deteriorating damper can cause excessive gear train noise at variable points in the speed range.

The damper is mounted to the crankshaft which is located behind the belt guard on the front of the engine.

Viscous vibration damper

Typical example

(1) Crankshaft pulley

(2) Weight

(3) Case


Inspect the damper for the following conditions:


  • The damper is dented, cracked, or fluid is leaking from the damper. 
  • The paint on the damper is discolored from excessive heat. 
  • The damper is bent. 
  • The bolt holes are worn or there is a loose fit for the bolts. 
  • The engine has had a crankshaft failure due to torsional forces. 

Replace the damper if any of these conditions exist.

Removal and Installation

Refer to this Operation and Maintenance Manual, “Belts – Inspect/Adjust/Replace” for information on removing and on installing the belt. Refer to the Disassembly and Assembly Manual, “Vibration Damper and Pulley – Remove and Install” for information on removing and installing the damper.

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