Vibration Damper

100

TM 9-2320-312-24-2

Testing and Adjusting Section

If the alignment marks are not aligned, the

i01854720

rubber portion of the rubber vibration damper has

Vibration Damper - Check

separated from the hub and/or from the ring. When

the alignment marks are not aligned, replace the

SMCS Code: 1205-535

rubber vibration damper.

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:

1. 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.

2. 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.

g00295949

Illustration 88

3. Set the dial indicator to a reading of 0.0 mm

(0.00 inch).

Rubber vibration damper

(1)

Crankshaft

4. Turn the crankshaft by 360 degrees and watch

(2)

Hub

(3)

Rubber

the dial indicator. A total indicator reading

(4)

Ring

of 0.00 to 2.03 mm (0.000 to 0.080 inch) is

(5)

Alignment marks

acceptable.

Damage 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 forces

The rubber vibration damper displays alignment

marks on the hub and on the ring. These marks

indicate the condition of the rubber vibration

damper.