Distinctive features of the twelve-point head bolt with ribbing and the twelve-point head bolt without ribbing. |
The twelve-point head bolts can be distinguished by the contact surfaces -arrow A- and -arrow B-. |
I - | Twelve-point head bolt with ribbing -arrow A- |
II - | Twelve-point head bolt without ribbing -arrow B- |
Caution Wheel bearings must not be subjected to load after loosening bolt securing drive shaft at wheel hub. |
If they have to support the weight of the vehicle they will be damages and their service life will be reduced. |
It is not permissible to turn drive shaft bolt more than 90° anti-clockwise if vehicle is standing on its wheels. |
Do not attempt to move the vehicle without the drive shafts fitted; this would result in wheel bearing damage. If a vehicle nevertheless has to be moved, comply with the following: |
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| Install an outer joint instead of the drive shaft. |
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| Tighten outer joint to 120 Nm. |
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Loosening twelve-point bolt |
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| With the vehicle still standing on its wheels, loosen the dodecagonal bolts by maximum 90° in order not to damage the wheel bearing. Use the 24 mm socket insert -T10361- to do this. |
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| Raise vehicle so that wheels are off the ground. |
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| Have second mechanic apply brakes. |
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