Figure 11B-98. Front Cover
T i g h t e n i n g Sequence
powers requires frequent speed and load
changes.
The viscous damper provides
faster response to load and speed chang-
e s and high temperatures have a less ad-
F i g u r e 11B-99. Removing Vibration
verse effect than on the rubber type
Damper Assembly
damper.
Remove Vibration Damper from Crank-
The viscous damper assembly consists of
shaft
a sealed outer shell, and internal fly-
wheel and a quantity of highly viscous
1. Remove the crankshaft pulley bolt.
fluid (see Figure 11B-99).
The small
clearance between the flywheel and the
2. Remove the crankshaft pulley.
outer shell is filled with the fluid which
causes the flywheel to be driven upon
3. Reinstall the pulley crankshaft bolt
acceleration and permits it to "freewheel"
and install a puller as shown in
upon deceleration.
Figure 11B-99 and Figure 11B-100 on
page 11B-64 to loosen the outer cone
During operation, the outer shell, which
wedged between the crankshaft and the
is firmly attached to the crankshaft,
damper hub.
After loosening the cone,
turns at the same speed as the crank-
it may be "fished" from the inner diam-
shaft, its motion being transferred to the
eter of the damper hub with two thin
flywheel through the fluid within the
shank screwdrivers.
shell.
Inasmuch as "fluid-drive" is more
or less inefficient with frequent speed
NOTE
changes, c o n s i d e r a b l e s l i p p a g e o f t h e
flywheel will take place as the power im-
Pounding with a hammer or prying
pulses
are
transmitted
through
the
with other tools must not be re-
crankshaft.
In this type of operation,
sorted to in removing the viscous
the slippage is desirable since the accel-
type damper from the crankshaft,
eration and deceleration of the flywheel
since the outer shell may be dent-
in the damper lessens the amplitude of
ed and cause the flywheel to turn
the vibrations, thereby reducing their
at the same speed as the outer
effects to a point where they are not
shell, t h u s r e n d e r i n g t h e d a m p e r
harmful to the engine.
i n e f f e c t i v e . The damper cannot be
repaired.
The vibration damper must be removed
whenever the crankshaft,
crankshaft
front cover or crankshaft front oil seal is
4. Slide the vibration damper as an as-
removed or replaced.
sembly off the end of the crankshaft by
hand.
5. Slide the inner cone from the crank-
shaft.
E n g i n e (Less Major Assemblies)
