ISM, ISMe, and QSM11 – 001-052   Vibration Damper, Viscous

Install the vibration damper, crankshaft pulley, and clamping plate. Refer to Procedure 001-022 in Section 1.

Clean the outside surface of the vibration damper.

To measure damper eccentricity (out of round), install the dial indicator gauge, Part Number 3376050, and extension Part Number ST-537-4, on the gear cover as indicated.

Rotate the crankshaft with the accessory driveshaft one complete revolution (360 degrees), and record the total indicator movement.

Replace the vibration damper if the eccentricity exceeds 0.28 mm [0.011 in].

To measure wobble (face alignment), install the dial indicator as shown.

Push the crankshaft to the front or rear of the engine and “0” (zero) the indicator.

Rotate the crankshaft with the accessory driveshaft one complete revolution (360 degrees) while maintaining the position of the crankshaft either toward the front or the rear of the engine.

Record the total indicator movement.

Replace the damper if wobble exceeds 0.28 mm [0.011 in].