Possible cardan shaft malfunctions, their causes and methods of elimination (VAZ-21213)

Cause of malfunction	Method of elimination
1. Loosening the bolts and nuts securing the elastic coupling and cardan joint flanges.	1. Tighten the nuts to the torques specified in the appendix.
2. Increased circumferential clearance in the splined connection of the front or rear cardan shafts.	2. Check the clearance size on the average diameter of the splines; if it is more than 0.30 mm, replace the worn parts.
3. Wear of cardan joints.	3. Repair the hinges by replacing worn parts.

Cause of malfunction	Method of elimination
1. Deformation of the front or rear cardan shafts.	1. Straighten the shafts on a press or replace them.
2. Imbalance of cardan shafts.	2. Check and balance the shafts (see "Balancing of shafts").
3. Wear or damage to the centering sleeve of the intermediate cardan shaft flexible coupling flange.	3. Replace the coupling flange bushing.
4. Wear of cardan joints.	4. Repair the hinges by replacing worn parts.
5. Loosening of the seal collar of the splined connection of the front or rear cardan shafts.	5. Press the oil seal and crimp its collar; if grease leaks, replace the oil seal.
6. Insufficient lubrication of splined connections.	6. Lubricate the splined joints with Fiol-1 or Fiol-2U grease through grease nipples.

Cause of malfunction	Method of elimination
1. Loosening of the seal collar of the splined connection of the front or rear cardan shafts.	1. Press the oil seal and crimp the collar, replace the worn oil seal.
2. Damage to the protective cover of the constant velocity joint of the intermediate shaft.	2. Disassemble the joint, replace the grease and protective cover. If the parts are damaged, replace the joint as a whole.