KIT-SEAL REPAIR 8U7966 - Caterpillar

Rubber Vibration Damper (If Equipped)
Illustration 1 g00295949
Rubber vibration damper (1) Crankshaft (2) Hub (3) Rubber (4) Ring (5) Alignment marksDamage to the vibration damper or failure of the vibration damper will increase vibrations. This will result in damage to the crankshaft.If any of the following problems with the rubber vibration damper exist, replace the rubber vibration damper:
Damaged
Bent
Worn bolt holes with loose fit for bolts
Crankshaft failure due to torsional forcesThe rubber vibration damper displays alignment marks on the hub and on the ring. These marks indicate the condition of the rubber vibration damper.If the alignment marks are not aligned, the rubber portion of the rubber vibration damper has separated from the hub and/or from the ring. When the alignment marks are not aligned, replace the rubber vibration damper.A used rubber vibration damper can have a visual wobble of the outer ring. When the vibration damper rotates, this wobble consists of movement from the front to the rear. This does not call for a replacement, because some wobble of the outer ring is typical. Use the following procedure to make sure that the wobble of the outer ring is acceptable:
Install a dial indicator, a contact point, or other parts that are required to hold the dial indication stationary.Note: The contact point must be perpendicular (90 degree angle) to the face of the outer ring of the rubber vibration damper. The contact point must make contact near to the center of the outer ring.
Push on the front end of the crankshaft in order to prevent any end play. End play would be free movement on the centerline. You must keep pressure on the crankshaft, until you complete the measurements.
Set the dial indicator to a reading of 0.0 mm (0.00 inch).
Turn the crankshaft by 360 degrees and watch the dial indicator. A total indicator reading of 0.00 to 2.03 mm (0.000 to 0.080 inch) is acceptable.Viscous Vibration Damper
Illustration 2 g00295962
Viscous Vibration Damper (1) Crankshaft (2) Weight (3) CaseDamage to the vibration damper or failure of the vibration damper will increase vibrations. This will result in damage to the crankshaft.If any of the following problems with the viscous vibration damper exist, replace the viscous vibration damper:
Leaking
Damaged
Bent
Worn bolt holes with loose fit for bolts
Crankshaft failure due to torsional forces
Inspect the viscous vibration damper for signs of leaking and for signs of damage to the case. Either of these conditions can cause the weight to contact the case. This contact can affect damper operation.