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yoke weld a t the axle end o f t h e d r i v e shaft tube).
N u m b e r t h e m a r k e d positions 1 t h r o u g h 4.
(8) Connect a tachometer t o t h e engine i g n i t i o n .
S t a r t the engine, shift t h e transmission i n t o f o r w a r d
gear and accelerate the engine u n t i l v i b r a t i o n occurs.
N o t e the a m o u n t (intensity) o f v i b r a t i o n , observe the
tachometer a n d note the engine speed (rpm) at w h i c h
t h e v i b r a t i o n occurred. Stop t h e engine.
(9) I n s t a l l a n d t i g h t e n a " w o r m - d r i v e screw" type
Fig. 5 Clamp Screw
At Position "1"
hose clamp on the drive shaft w i t h t h e screw located
a t p o s i t i o n " 1 " (Fig. 5).
(10) S t a r t t h e engine, s h i f t t h e transmission i n t o
forward gear and accelerate t h e engine t o t h e speed
(rpm) at w h i c h the v i b r a t i o n occurred (above).
(11) Compare the a m o u n t (intensity) o f v i b r a t i o n t o
t h e i n i t i a l a m o u n t (intensity) o f v i b r a t i o n . I f there is
l i t t l e or no change i n the v i b r a t i o n , move the clamp
screw to one o f the other three m a r k e d positions and
repeat the v i b r a t i o n test.
(12) I f no difference i n t h e a m o u n t (intensity) o f v i -
b r a t i o n is detected w i t h t h e clamp screw located a t
a l l four positions, t h e v i b r a t i o n possibly is n o t be
caused by drive shaft unbalance.
(13) I f t h e amount (intensity) o f v i b r a t i o n de-
creased (but was not completely eliminated) w i t h the
clamp screw located a t one o f the m a r k e d positions,
i n s t a l l a second clamp o n t h e drive shaft tube w i t h
t h e screw adjacent to t h e f i r s t clamp screw (Fig. 6)
a n d repeat the v i b r a t i o n test.
(14) The combined w e i g h t o f two clamp screws a t
t h e same position could cause a n additional u n b a l -
anced condition. I f so, separate the clamp screws ap-
proximately 1/2 i n c h (1/4 i n c h above a n d 1/4 i n c h
below the m a r k e d position) a n d repeat the v i b r a t i o n
test (Fig. 7).
(15) Continue t o increase t h e separation distance
between the clamp screws a n d repeat the v i b r a t i o n
test u n t i l t h e amount ( i n t e n s i t y ) of v i b r a t i o n is a t
the lowest level. Bend the loose end o f the clamps so
t h a t the clamp screws w i l l n o t loosen.
DRIVE SHAFTS AND UNIVERSAL JOINTS
18 - 11
RF489
Fig. 7 Clamp Screws
Separated
(16) I n s t a l l t h e wheels/tires and the wheel covers.
Remove the supports, lower the vehicle and road test.
(17) I f the a m o u n t (intensity) of v i b r a t i o n remains
unacceptable, apply t h e same instructions (above) a t
t h e f r o n t end of t h e drive shaft.
RUNOUT
(1) Remove a l l d i r t , rust, paint, and undercoating
f r o m t h e drive shaft tube surface areas where t h e
d i a l indicator p l u n g e r w i l l contact the surface o f the
drive shaft tube.
(2) T h e d i a l i n d i c a t o r m u s t be installed perpendic-
u l a r to the shaft t u b e surface and must be f i r m l y at-
tached to a fixed
surface
to prevent
inaccurate
measurements.
(3) Measure t h e d r i v e shaft r u n o u t a t t h e center
and a t both ends o f t h e shaft tube w i t h the d i a l i n -
dicator.
(4) Refer t o t h e D r i v e Shaft Runout Specifications
chart.
(5) Replace t h e d r i v e shaft i f the r u n o u t exceeds
the specified l i m i t a t either the front, center or rear
of the shaft tube.
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