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UNBALANCE NOTE: Removing and re-indexing the propeller shaft, 45° at a time, relative to the companion flange If propeller shaft is suspected of being unbalanced, it can be verified with the following procedure: (1) Raise the vehicle. ler shaft and the universal joints. (3) Inspect the propeller shaft for missing balance weights, broken welds, and bent areas. If the pro- (4) Inspect the universal joints to ensure that they are not worn, are properly installed, and are cor- (5) Check the companion flange bolts torque. lug nuts to retain the brake drums or rotors. (7) Mark and number the shaft six inches from the yoke end at four positions 90° apart. (8) Run and accelerate the vehicle until vibration occurs. Note the intensity and speed the vibration (9) Install a screw clamp at position 1 (Fig. 8). (10) Start the engine and re-check for vibration. If there is little or no change in vibration, move the (11) If there is no difference in vibration at the other positions, the source of the vibration may not (12) If the vibration decreased, install a second clamp (Fig. 9) and repeat the test. (13) If the additional clamp causes an additional vibration, separate the clamps (1/4 inch above and (14) Increase distance between the clamp screws and repeat the test until the amount of vibration is (15) If the vibration remains unacceptable, apply the same steps to the front end of the propeller shaft. (16) Install the wheel and tires. Lower the vehicle. RUNOUT (1) Remove dirt, rust, paint, and undercoating from the propeller shaft surface where the dial indi- (2) The dial indicator must be installed perpendic- ular to the shaft surface. (3) Measure runout at the center and ends of the shaft sufficiently far away from weld areas to ensure Fig. 8 Clamp Screw At Position 1–Typical 1 – CLAMP Fig. 9 Two Clamp Screws At The Same Position–Typical Fig. 10 Clamp Screws Separated–Typical 1 – 1 ⁄ 2 INCH 3 - 6 PROPELLER SHAFTS DN DIAGNOSIS AND TESTING (Continued) |