TM 5-3895-359-14&P
inspect the engine mounts to be sure they are not loose,
CAUTION
cracked or deteriorated.
Pounding with a hammer or prying
with other tools must not be resorted
Install Vibration Damper on Crankshaft
to in removing the viscous type
damper from the crankshaft, since
Refer to the illustrations for relative location of the parts
the outer shell may be dented and
and assemble as follows:
cause the fly-wheel to turn at the
1. Coat the lip of the oil seal in the front cover
same speed as the outer shell, thus
(trunnion) lightly with cup grease or vegetable
rendering the damper ineffective.
shortening.
The damper cannot be repaired.
2. Slide the inner cone, with the tapered end pointing to
5. Slide the vibration damper or dampers and damper
the front of the crankshaft, next to the oil slinger.
hub as an assembly off the end of the crankshaft by
NOTE
hand.
When the vibration damper and
6. Slide the inner cone from the crankshaft.
crankshaft pulley are bolted together
and mounted on the front end of the
Inspect Vibration Damper
crankshaft (Fig. 3), extra precaution
should be taken to be certain that the
After removal. clean the vibration damper in fuel oil and
inner cone does not prematurely
dry it with compressed air.
clamp to the crankshaft.
3. Slide the damper and hub as an assembly -- long
Examine the damper for dents, nicks, fluid leakage or
end of the hub facing the crankshaft cover -- into
bulges in the outer casing of the damper.
Any
position.
indications of the above are sufficient cause for
NOTE
replacing the damper. Due to the close clearances
between the internal flywheel and outer casing, dents
Do not hit a viscous type damper
may render the damper ineffective. Bulges or splits
with a hammer to position it on the
indicate the fluid has ignited and expansion of the
crankshaft.
resultant gases has bulged or forced the casing open at
4. Install the crankshaft pulley and vibration damper
its crimped edges.
assembly with the damper assembly side of the pulley
facing the crankshaft front cover.
Since the viscous type damper is a precision built
5. Slide the outer cone over the crankshaft and into the
closely fitted and sealed device, it is not possible to
hub of the vibration damper.
repair it.
6. Install the crankshaft pulley.
Regardless of condition. the viscous type damper
should be replaced at time of normal periodic major
engine overhaul.
If damage to the vibration damper is extensive. Inspect
the crankshaft as outlined on Page 10-2-49. A loose or
defective vibration damper. after extended operation,
may result in a cracked crankshaft.
Inspect the damper spacer cones, hub and the end of
the crankshaft for galling or burrs. Slight scratches or
burrs may be removed with emery cloth. If seriously
damaged, the parts should be replaced and the end of
the crankshaft refinished. Check the outside diameter
of the inner cone for wear at the crankshaft front oil seal
contact surface. If worn, replace the oil seal and cone
A loose engine mount could damage the vibration
damper by allowing the engine to move slightly during
Fig. 3. Vibration Damper and Crankshaft Pulley
operation. Therefore, it is good practice to periodically
Assembly Mounting
10-2-67
