Chrysler DODGE D150 1993 Service Manual page 949

1 6 - 4 PROPELLER SHAFTS
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(8) Run and accelerate the vehicle until vibration
occurs. Note the intensity and speed the vibration oc­
curred. Stop the engine.
(9) Install a screw clamp at p o s i t i o n I (Fig. 1).
Fig. 1 Clamp Screw At Position 1
(10) Start the engine and re-check for vibration. If
there is little or no change in vibration, move the
clamp to one of the other three positions. Repeat the
vibration test.
(11) If there is no difference, the vibration may not
be caused by propeller shaft unbalance.
(12) If the vibration decreased, install a second
clamp (Fig. 2) and repeat the vibration test.
Fig. 2 Two Clamp Screws At The Same Position
(13) If vibration increased, separate the clamp
screws (1/4 inch above and 1/4 inch below the mark).
Repeat the vibration test (Fig. 3).
(14) Increase distance between the clamp screws.
Repeat the test until the amount of vibration is at
the lowest level. Bend the slack end of the clamps so
the screws will not loosen.
(15) Install t h e wheel and tire. Remove supports
and lower the vehicle.
RF4B9
Fig. 3 Clamp Screws Separated
(16) If the amount of vibration remains unaccept­
able, apply procedures at the front end of propeller
shaft.
RUNOUT
(1) Remove dirt, rust, paint, and undercoating
from the propeller shaft surface. Areas where the
dial indicator will contact the shaft must be clean.
(2) The dial indicator must be installed perpendic­
ular to the shaft surface.
(3) Measure runout at the center and ends.
(4) Refer to Runout Specifications chart.
(5) Replace the propeller shaft if the runout ex­
ceeds the limit.
RUNOUT SPECIFICATIONS
Front of shaft 0.010 in. (0.25 mm)
Center of shaft . 0.015 in. (0.38 mm)
Rear of shaft .
0.010 in. (0.25 mm)
NOTE: Measure front/rear runout approximately 3 inches
(76 mm) from the weld seam at each end of the shaft tube
for tube lengths over 30 inches. Under 30 inches the max.
runout is 0.20 inch for full length of the tube.
J9116-15
UNIVERSAL JOINT ANGLE MEASUREMENT
INFORMATION
When two shafts intersect, the bend t h a t is formed
is called the working angle. The larger the angle, the
larger the amount of acceleration and deceleration of
the joint. This speeding up and slowing down of the
joint must be cancelled. This will produce a smooth
power flow. This is done through phasing and proper
universal joint working angles.