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CAUTION: Propeller shafts are balanced by the manufacturer. Before undercoating a vehicle, the propeller CAUTION: Never allow the propeller shaft to drop or hang from the universal joint during removal. Suspend CAUTION: Protect the machined external surface of the slip yoke from damage after propeller shaft removal. DIAGNOSIS AND TESTING - PROPELLER SHAFT VIBRATION Tires that are out-of-round, or wheels that are unbalanced, will cause a low frequency vibration. Brake rotors that are unbalanced will cause a harsh, low frequency vibration. Driveline vibration can also result from loose or damaged engine mounts. Propeller shaft vibration increases as the vehicle speed is increased. A vibration that occurs within a specific speed DRIVELINE VIBRATION CONDITION POSSIBLE CAUSES CORRECTION PROPELLER SHAFT NOISE 1. Undercoating or other foreign 1. Clean exterior of shaft and wash 2. Loose or bent U-joint yoke or 2. Install new yoke. 3. Incorrect driveline angularity. 3. Measure and correct driveline 4. Worn U-joint bearings. 4. Install new U-joint. 5. Propeller shaft damaged or out 5. Install new propeller shaft. 6. Excessive runout or unbalanced 6. Re-index propeller shaft, test, and 7. Excessive axle yoke deflection. 7. Inspect and replace yoke if UNIVERSAL JOINT NOISE 1. Lack of lubrication. 1. Replace U-joints as necessary. BALANCE If propeller shaft is suspected of being unbalanced, it can be verified with the following procedure: 1. Raise and support the vehicle. 2. Clean all the foreign material from the propeller shaft and the universal joints. Note: If the propeller shaft is bent, it must be replaced. 3. Inspect the propeller shaft for missing balance weights, broken welds, and bent areas. 4. Inspect the universal joints to ensure that they are not worn, are properly installed, and are correctly aligned with the shaft. 5. Check the universal joint clamp bolts for proper torque. 6. Check the propeller shaft to transmission and differential flange retaining bolts for proper torque. 7. Remove the wheels and tires. Install the wheel mounting bolts to retain the brake rotors. ZH PROPELLER SHAFT 3 - 27 |