Operation and maintenance manual

QSB4.5 and QSB6.7 Vibration Damper, Viscous
Section 7 - Maintenance Procedures at 2000 Hours or 2 Years Page 7-7
Vibration Damper, Rubber
Inspect
Check the index lines (A) in the vibration damper hub (B)
and the inertia member (C). If the lines are more than 1.59
mm [1/16 in] out of alignment, replace the vibration
damper.
Inspect the rubber member for deterioration. If pieces of
rubber are missing or if the elastic member is more than
3.18 mm [1/8 in] below the metal surface, replace the
damper.
Look for forward movement of the damper ring on the
hub. Replace the vibration damper if any movement is
detected.
For vibration damper location, refer to Engine Diagrams in
Engine Identification (Section E).
Vibration Damper, Viscous
Inspect
CAUTION
The silicone fluid in the vibration damper will become
solid after extended service and will make the damper
inoperative. An inoperative vibration damper can
cause major engine or drivetrain failures.
Check the vibration damper for evidence of fluid loss,
dents, and wobble. Inspect the vibration damper thickness
for any deformation or raising of the damper cover plate.
If any of these conditions are identified, contact your local
Cummins Authorized Repair Location to replace the
vibration damper.
For vibration damper location, refer to Engine Diagrams in
Engine Identification (Section E).