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Loosening and tightening twelve-point bolt (without ribbing) securing drive shaft > < Loosening and tightening hexagon bolt securing drive shaft

A3 Mk2

Loosening and tightening twelve-point ribbed bolt securing drive shaft
Loosening and tightening twelve-point ribbed bolt securing drive shaft
Special tools and workshop equipment required
   
t  Socket (24 mm) -T10361-
  W00-10516
t  Angle wrench -V.A.G 1756-
  W00-0449
Identification of twelve-point bolts with and without ribbing
The difference between the twelve-point bolts can be seen at the contact surface under the bolt head -arrow A- and -arrow B-.
I - Twelve-point ribbed bolt -arrow A-
II - Twelve-point bolt without ribbing -arrow B-
If the wheel bearings are subjected to the full weight of the vehicle they will be overloaded, resulting in reduced service life. Therefore please note the following:
t  Procedure for loosening twelve-point bolt
Do not attempt to move the vehicle without the drive shafts fitted; this would result in wheel bearing damage. If the vehicle does have to be moved, always note the following points:
–  Fit an outer joint in place of the drive shaft.
–  Tighten the outer joint to 120 Nm.
  N40-10569
Loosening twelve-point bolt
–  To avoid damage to wheel bearing, slacken off twelve-point bolt no further than 90° with vehicle still standing on its wheels, using socket (24 mm) -T10361-.
–  Raise vehicle so that wheels are off the ground.
–  Have a second mechanic press the brake pedal.
–  Remove twelve-point bolt -arrow-.
Installing twelve-point bolt
–  Renew twelve-point bolt.
  Note
The wheels must not be in contact with the ground when initially tightening the drive shaft bolt; otherwise the wheel bearing can be damaged.
–  Have a second mechanic press the brake pedal.
–  Tighten twelve-point bolt to 70 Nm.
–  Lower vehicle onto its wheels.
–  Turn twelve-point bolt 90° further.
  A40-10419

Loosening and tightening twelve-point bolt (without ribbing) securing drive shaft > < Loosening and tightening hexagon bolt securing drive shaft