Rear wheel bearing spacer

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My E21(s): '82 US 320i manual

Rear wheel bearing spacer

Post by AMWroofing »


I've got an 1982 320i. I'm gathering parts to rebuild/restore the rear end.

I picked up a pair of 323 trailing arms, for a rear disc conversion. After taking those apart and understanding the diagrams vs. reality - a question.

I see why they use a wheel bearing tube spacer. However, if you measure the tube length, you'll find that it is a few mm longer than the machined lip/shoulder within the bearing housing. This is where the variable width shim comes into play. These shims are NLA. But the more I look at it though, I'd just assume one could turn down one end of the spacer tube to match the exact width of the shoulder spacing.

Not everyone has a lathe at thier disposal, so yes, the shims make perfect sense. But if you can't get said shims for such a spacing measurement...then why not narrow the tube to fit. It's one in the same, yes?

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Re: Rear wheel bearing spacer

Post by BertjeConti »

Makes sense but, the minimal thickness of the spacer is 2.5mm, if you install the outer bearing without this spacer, the hub sits 2,5mm further inward as it should. I don't think thats a good idea.

Can't you use the old spacer which is already in the housing? As i see how it works, spacer and wheelbearing housing are paired together.
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Re: Rear wheel bearing spacer

Post by uwbuurman »

Yup, that's correct, Rob. Use the old spacer ring.
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1978 BMW 323i
1980 BMW 528i maior restitutio
1987 BMW 325iA cabriolet
2006 BMW 320d touring High Executive
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