Dodge ZB 2005 Service Manual page 107

3 - 2 PROPELLER SHAFT
PROPELLER SHAFT (Continued)
CONDITION
PROPELLER SHAFT VIBRATION
UNIVERSAL JOINT NOISE
PROPELLER SHAFT BALANCE
If propeller shaft balance is suspected, it can be
verified with the following procedure.
NOTE: Removing and re-indexing the propeller
shaft 180° may eliminate some vibrations.
Clean all the foreign material from the propeller
shaft and the universal joints (mud, undercoating,
etc.).
Inspect the propeller shaft for missing balance
weights, broken welds, and bent areas. If the pro-
peller shaft is found with any of these condi-
tions, the shaft must be replaced.
Ensure the universal joints are not worn, are prop-
erly installed, and correctly aligned with the shaft.
Check the universal joint clamp screws torque.
Check universal joint angles.
(1) Raise and support the vehicle.
(2) Remove the wheels/tires. Install the wheel lug
nuts to retain the brake discs.
(3) Mark and number the propeller shaft tube
approximately six inches from the yoke weld end at
four positions 90° apart.
(4) Run and accelerate the vehicle until vibration
occurs. Note the intensity and speed the vibration
occurred. Stop the engine.
(5) Install a screw clamp at position 1 (Fig. 1).
POSSIBLE CAUSE
1. Undercoating or other foreign
material on shaft.
2. Loose U-joint clamp screws.
3. Loose or bent U-joint yoke or
excessive runout.
4. Incorrect drive line angularity.
5. Rear spring center bolt not in
seat.
6. Worn U-joint bearings.
7. Propeller shaft damaged (bent
tube) or out of balance.
8. Broken rear spring.
9. Excessive runout or unbalanced
condition.
10. Excessive drive pinion gear
shaft yoke runout.
1. U-joint clamp screws loose.
2. Lack of lubrication.
1 - CLAMP
2 - SCREWDRIVER
(6) Start the engine and recheck 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.
(7) If there is no change in amount of vibration at
other positions, the vibration may not be caused by
prop shaft unbalance.
CORRECTION
1. Clean exterior of shaft and wash
with solvent
2. Tighten screws properly.
3. Install replacement yoke.
4. Correct angularity
5. Loosen spring U-bolts and seat
center bolts.
6. Install replacement propeller
shaft.
7. Install replacement propeller
shaft.
8. Replace rear spring.
9. Reindex propeller shaft 180
degrees, test and correct as neces-
sary.
10. Reindex propeller shaft 180
degrees and evaluate.
1. Tighten screws with specified
torque.
2. Replace U-joint.
Fig. 1 CLAMP AT POSITION 1
ZB