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Help! I need a shim off the rear hub/axle.


Brandon73fjord
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I had few minutes so I dug up the picture.

02rearwheelbearings02diagramspec.jpg

Unless you have access to selection of micrometers AND you can use them I would suggest taking your trailing arms with the inner sleeves and bearings to a machine shop with this picture. Ask them to define which shims you need and hope that they are still available.

I did replace the bearings just last week. I had the shims but I had mixed left and right and they had 0.1mm difference. I had hard time figuring out which go where by using just caliper gauge. Caliper accuracy would not be enough to determine the thickness.

hth, Tommy

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Brandon - if you had a copy of the BMW Repair Manual,

the procedure for measuring and determining the tickness

of shim needed, it's position, is clear.

There is an instruction sheet included with the bearing kit

if you purchased one from BMW

Shims are available from BMW

GREAT care is needed in assembling/pressing the new bearings

into the control arm. You do not want to 'dent' the races by pounding

on the bearings improperly and having the balls 'dimple' the races.

You DO NOT EVER REUSE REAR WHEEL BEARINGS!.

Having too much bearing installation play will result in overloading

the stub axle when tightening - your stretching the stub axle trying

to acheive the correct tightening torque. And having too little

bearing clearance would cause overloading of the bearings when

tightening the stub axle nut. Hopefully the condition of the splines

on the hub and stub axle are not a question here or any work

willbe for nothing. Worn splines and poor fit will result in quick

loosening and more - a broken stub axle and wheel parting

from the car while driving.

Big job, serious consequences, fatal results if botched.

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I think what CD is saying about bearing installation is do not pound or press on the inner portion of the bearing when fitting. I use an old bearing as a drift to put equal pressure on the outer race when installing. I ground the OD of the old bearing down a bit so it would not get stuck in the trailing arm when the new bearing seats. Can also use this drift to drive in the grease seals as well.

When removing the old bearings, use a brass drift when driving them out from the opposite side so the trailing arm does not get any scratches or burrs. These make putting new bearings in difficult! I have used (carefully) a big screwdriver in the past, but a brass drift is softer and much safer to use. Shim price and availability below:

SPACER RINGS (Maximillian prices)

2,800MM 33411118731 $7.44 ($6.02 @ Husker)

2,900MM 33411118733 $7.44

3,000MM 33411118735 $6.31

3,100MM 33411118778 N/A ($3.02 @ Husker)

3,300MM 33411118872 $7.44

3,400MM 33411118874 $7.44

Husker BMW Direct Parts

www.bmwmercedesparts.com

Fred '74tii

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