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Benino

the inner race on my outer rear wheel bearing cracked. It's been a long time since I did wheel bearings and I don't remember exactly how the outer spacer that gets torqued against the wheel bearing inner race looks. Does anyone have one laying around to compare?

I'm wondering if that indented grove on the surface that presses against the wheel bearing race is supposed to be there of if that's wear.

Just for fun, here's a picture of how the inner race of the wheel bearing looked.

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1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA

!tom · Posted: Fri Mar 12, 2021 7:28 am Post subject:

It's been a long time, but I thought there was a spacer between the inner races.

Nut -> outer ball bearing -> spacer -> inner roller bearing -> spindle
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78 924 NA
5-lug

Benino · Posted: Fri Mar 12, 2021 11:29 am Post subject:

Here's the stub axle with all three spacers on it.

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1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA

924RACR · Posted: Sat Mar 13, 2021 1:20 am Post subject:

That's wear, and if the hardened outer spacer is so worn, I'd recommend replacing ALL of them.

We've snapped a few stub axles racing, and I have come to blame it on worn spacers allowing the nut to thread too far down, resulting in cutting new threads in the end of the stub axle, weakening it and popping the axle at the base of the threads.

Thankfully, we have disc brakes on the rear (M471), and the calipers do a great job of holding the rear wheels on till the car comes in.

Also thankfully - this is a common SuperBeetle part. I just found a source for chromoly spacers, including the tube spacer, and got a set. Haven't installed 'em yet, they go on this spring, but hoping this resolves our axle snapping issues...

Pretty sure this was the set I got:
https://dunebuggywarehouse.com/rear-axle-spacer-set-6-irs.html

Yay for cheap VW parts!!
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Benino · Posted: Sat Mar 13, 2021 2:10 am Post subject:

Thanks! I appreciate the info. I thought that might be wear but it was so uniform, it was hard to tell. I ordered the dune buggy parts. I'll be off-roading in no time!

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1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA

Benino · Posted: Tue Mar 23, 2021 1:23 pm Post subject:

I made a time-laps video of installing the new spacers and wheel bearings. Thought I'd share it.

https://youtu.be/n7dSzYJmGCI
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1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA

924RACR · Posted: Tue Mar 23, 2021 8:54 pm Post subject:

Very nice!

Was happy to see the torque wrench come out for the backing plate!
_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11724 Location: PacNW

Ha, that video is pretty fun
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3