To determine if repair of the vibration damper is possible or replacement is necessary, perform the following procedure. See Figure 31647 .
Repair or Replacement of Crankshaft Vibration Damper Flowchart
To determine if repair of the pulley is possible or replacement is necessary, perform the following procedure. See Figure 21774 .
Repair or Replacement of Crankshaft Vibration Damper Pulley Flowchart
Remove the vibration damper assembly as follows:
Note: Do not pry the crankshaft pulley back and forth. Pry only in one direction, to eliminate the possibility of replacing a damper for excessive wobble when the crankshaft end play was really excessive from any readings taken.
Vibration Damper Removal
Front Engine Mounting Bracket Removal
A condition known as streaking may be observed on the vibration damper; see Figure 31541 . Detroit Diesel has established guidelines for replacement of the vibration damper when this condition occurs.
Vibration Damper Showing Rubber Streaking
Rubber streaking may become evident as the rubber, found between the inertia ring and the damper pulley, begins its normal life cycle. see Figure 31542 . This process is caused by high temperatures generated within the damper as it absorbs the energy of the rotating crankshaft. The time required to generate this condition varies greatly due to differences in engine ratings and vehicle applications.
1. Vibration Damper Pulley (Inner Member)
3. Inertia Ring (Outer Member)
2. Rubber Compound
Vibration Damper Cross-Sectional View
Streaking generally occurs on both front and rear surfaces of the vibration damper. A damper showing signs of streaking does not require replacement and can remain in operation for some time. To determine when the vibration damper should be replaced, use the following guidelines:
Vibration Damper Requiring Replacement
Install the vibration damper assembly as follows: