Cummins ISX11.9 CM2250 – Service Manual 001-052   Vibration Damper, Viscous

Make sure the mounting surfaces of the crankshaft nose, vibration damper, and the pulley are clean, dry, and free from burrs.

Install two guide studs into the crankshaft nose.

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. Refer to Procedure 009-035 in Section 9.

Vibration Damper Eccentricity

If the vibration damper is not within specifications, it must be replaced.

To measure wobble (face alignment), rotate the crankshaft two complete revolutions (720 degrees) to make sure end play does not affect the measurements. Refer to Procedure 009-035 in Section 9.

NOTE: The rear crank gear on the ISX11.9 is a helical cut gear that will cause the crankshaft to be slightly pulled toward the rear of the engine, when rotated clockwise.

Install the dial indicator as shown.

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

Rotate the crankshaft one complete revolution (360 degrees) while maintaining the position of the crankshaft toward the rear of the engine. Refer to Procedure 009-035 in Section 9.

Record the total indicator movement.

Vibration Damper Wobble Measurement

If the vibration damper is not within specifications, it must be replaced.