Rear bearing spacer question

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mikeP

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I'm working on a 73 e9. I dissasembled the rear arms for powder coating and as it were it was missing spacer # 10 in the diagram linked. This supposedly goes where my pic is pointed in my picture below. this part number is no longer available so i need to machine my own. I'm hoping someone can provide me with the width. Is this spacer press fit or does it slide on and off by hand?

Can someone please help me out with how to calculate the shim thickness needed? Upon disassembly I made the mistake of not labeling the two shims and they are different thicknesses so i'm unsure as to which one goes on the driver side and vice versa.
I found this formula but i can't seem to find what A, b and c are as the blue book doesn't seem to be available anymore.


What the manual indicates is that the spacer C must equal (A-B)-.1mm

The case the manual cites is (63.5-58.6)-.1 with the result=C or 4.8mm

RealOEM.com - Online BMW Parts Catalog

BMW parts 2.5CS-3.0CSL 3.0CS Side shaft/wheel bearings
www.realoem.com

By the way I bought the chilton manual and it's worthless for e9's. Very little info actually pertains to the e9. Where are people getting their info from for these relics?


IMG_2748.jpg


RealOEM.com - Online BMW Parts Catalog

BMW parts 2.5CS-3.0CSL 3.0CS Side shaft/wheel bearings
www.realoem.com
 
Last edited:
Can't help on the part, but as to repair information, many of us have hunted down copies of the factory repair manual. Carl Nelson sells an electronic version; once in a while they show up on the parts forum:

Coupe Factory Repair Manual | La Jolla Independent

01 56 0 036 111 Get the complete factory repair manual on CD-ROM!
www.bimmerdoc.com
 
Best of my knowledge that spacer has never been available
It is permanent part of hub
 
I went through this several times with other people.
Not your fault-
 
Can anybody confirm the shim dimension formula i found below? What measurements is A and B referring to?

spacer C must equal (A-B)-.1mm

The case the manual cites is (63.5-58.6)-.1 with the result=C or 4.8mm
 
Wait a minute now, Don, you are showing 3 parts in your picture, there are only 2 pieces that you use the top piece goes where? ( looks like a 2002 hub ) There has to be a shim in there If you don't run a shim The bearings will be under a load from tightening the stub axle to the inner hub You have a spacer ( #7 ) in between the bearings that has to have a certain amount of clearance You have a bearing on each end, spacer/shim ( #6 in realoem ) at the inside of the inner bearing, the large spacer tube (#7) between the bearings, and that one needs to be calculated after putting in the outside bearing first, then fitting the large spacer /shim Then you have to measure the distance from the inner part of the outer bearing to the outer edge of the shim/spacer You then measure the length of the large tube spacer ( # 7 in releom ) and you need to be slightly larger measurement than the spacer tube to allow for the correct clearance between the bearings You get the correct clearance by changing the shim ( #6 ) to get your .1mm clearance Does this make sense to you ? I can do it without thinking that much but sometimes have a hard time to explain it

Thanks, Rick
 
the question I answered is about the spacer- not the shim.
 
The third piece in his pic is the front hub for these cars. Yeah i can see how explaining it can be difficult...What a tounge twister
 
stphers said:
Wait a minute now, Don, you are showing 3 parts in your picture, there are only 2 pieces that you use the top piece goes where? ( looks like a 2002 hub ) There has to be a shim in there If you don't run a shim The bearings will be under a load from tightening the stub axle to the inner hub You have a spacer ( #7 ) in between the bearings that has to have a certain amount of clearance You have a bearing on each end, spacer/shim ( #6 in realoem ) at the inside of the inner bearing, the large spacer tube (#7) between the bearings, and that one needs to be calculated after putting in the outside bearing first, then fitting the large spacer /shim Then you have to measure the distance from the inner part of the outer bearing to the outer edge of the shim/spacer You then measure the length of the large tube spacer ( # 7 in releom ) and you need to be slightly larger measurement than the spacer tube to allow for the correct clearance between the bearings You get the correct clearance by changing the shim ( #6 ) to get your .1mm clearance Does this make sense to you ? I can do it without thinking that much but sometimes have a hard time to explain it

Thanks, Rick
Click to expand...


So it sounds like the formula I have is not correct if we're trying to achieve .1mm clearance.

That helps a lot thanks I think i can get it figured out.
 
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