Contents: 35 Appearance of transmission oil… ↧ 36 When transferring load to the… ↧ 37 When the speed increases, a… ↧ 38 Vibration is noted ↧
35 Appearance of transmission oil leaks at the front of the propeller shaft
Failure of the gearbox or transfer case housing seal (chapter 7). Also inspect the flange fork splines of the cardan shaft for burrs and scoring, since the presence of these defects will damage the seal. Remove any imperfections using fine-grit sandpaper or an abrasive block.
36 When transferring load to the gearbox, clicking and knocking sounds are heard (immediately after engaging the gear)
1. Loosening or disconnection of a rear suspension element. Check the tightness of the fasteners and the reliability of the connecting bushings (see chapter 10).
2. Loosening of the propeller shaft bolts. Check the tightening of the fasteners and bring it into compliance with the standard.
3. Wear or damage to the universal joint bearings. Inspect for signs of wear (chapter 8).
37 When the speed increases, a metallic grinding sound appears
Signs of wear on cardan joint bearings. Inspect for signs of wear (chapter 8).
38 Vibration is noted
Note: Before deciding whether the driveshaft is faulty, make sure the wheels are in dynamic balance, then perform the following check.
1. Install a tachometer in the passenger compartment to monitor engine speed while the vehicle is moving. Drive the car, monitoring the engine speed using the tachometer. Determine the rotation speed at which vibration is most pronounced. When operating the engine, maintain the set speed in all gears.
2. If there is vibration at certain engine speeds (regardless of the selected gear) failure of the cardan shaft can be excluded, since its rotation frequency changes.
3. If the vibration decreases or disappears when shifting gears and maintaining the set rpm, one or more of the following causes should be assumed.
4. Skew or bend of the driveshaft. Check and replace if necessary (chapter 8).
5. Tar or road dirt sticking to the shaft. Clean and inspect the shaft.
6. Wear of cardan joint bearings. Remove and inspect the hinge (chapter 8).
7. Imbalance of the cardan shaft and/or connecting flange. Make sure there are balancing weights on the shaft. Remove the driveshaft (chapter 8) and reinstall it by rotating it 180°. If the vibration does not disappear after this, have the shaft balanced at a station of the appropriate qualification level.