TM 5-3810-300-24&P-3
VIBRATION DAMPER 1.3.6
CAUTION: Do not allow fuel oil to remain
on a rubber type vibration damper too long,
but blow it dry immediately after cleaning,
otherwise damage due to the action of the
fuel oil on the rubber may result.
Inspect the rubber type damper to see that the rubber is
firmly bonded to the metal parts at each side. If the
damper has been exposed to fuel oil, lubricating oil or
excessive heat, the rubber may have become loosened
from the metal. In this event, the damper should be
discarded and replaced with a new one. Also, check to
see that the metal discs "C", Fig. 1, are not bent.
Examine the viscous type damper for dents, nicks, fluid
leakage or bulges in the outer casing of the damper.
Any indications of the above are sufficient cause for
replacing the damper. Due to the close clearances
between the internal flywheel and outer casing, dents
Fig. 2. Removing Vibration Damper
may render the damper ineffective.
Assembly (Viscous Type)
Bulges or splits indicate fluid has ignited and expansion
2. Remove the crankshaft pulley or cap.
of resultant gases has bulged or forced the casing open
at its crimped edges.
3. On rubber type vibration dampers, remove two
damper-to-hub bolts and lock washers
Since the viscous type damper is a precision built closely
diametrically opposite to each other. Two puller
fitted and sealed device, it is not possible to repair it.
holes are provided in viscous damper.
Regardless of condition, the viscous type damper should
be replaced at time of a periodic major engine overhaul.
4. Reinstall the pulley crankshaft bolt and a puller
as shown in Fig. 2 to loosen the outer cone
If damage to the vibration damper is extensive, inspect
wedged between the crankshaft and the damper
the crankshaft as outlined in Section 1.3. A loose or
hub. After loosening cone it may be "fished"
defective vibration damper, after extended operation,
from the inner diameter of the damper hub with
may result in a cracked crankshaft.
two thin shank screwdrivers.
Inspect the damper cones, hub, sleeve, spacer and the
CAUTION: Pounding with a hammer, or
end of the crankshaft for galling or burrs.
Slight
prying with other tools must not be
scratches or burrs may be removed with emery cloth. If
resorted to in removing the viscous type
seriously damaged, the parts should be replaced and the
damper from the crankshaft. Dents in
end of the crankshaft refinished. Check the outside
the damper outer case may render the
diameter of the inner cone for wear at the crankshaft
damper ineffective. The damper cannot
front oil seal contact surface. If worn, the oil seal and
be repaired.
cone should be replaced (Section 1.3.2).
5. Slide the vibration damper or dampers with
Install Vibration Damper on Crankshaft
damper hub as an assembly off the end of the
crankshaft by hand.
Refer to the illustrations for relative location of the parts
and assemble as follows:
6. Slide the inner cone from the crankshaft.
1. Coat the lip of the oil seal in the front cover
Inspect Vibration Damper
(trunnion) lightly with cup grease or vegetable
shortening and lubricate the sleeve and spacer,
After removal, clean the vibration damper in fuel oil and
if used, with engine oil.
blow dry with compressed air.
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