Otis Wheel Studs

Fiat 500s that Do it Naturally.
sportfan
Posts: 219
Joined: Thu Sep 20, 2018 11:33 pm
Location: Ponca City, Ok.
Your Car's Year / Make / Model: 2013 Fiat 500 Sport

Otis Wheel Studs

Post by sportfan » Sat Apr 03, 2021 4:05 pm

I was finishing up replacing my rear wheel bearings today. I had an odd wear pattern on the new slotted discs I had installed several month ago. I checked the caliper pins to be sure that they weren't binding up ( thanks to the member that posted a warning on this ) and they were free. So I set up a dial indicator on the outer face of disc and it ran out .150". So I pulled the disc off and checked the face runout of the new hub. It was .001". So the problem was in the disc. I noticed that the wheel studs had a shoulder on them to limit how far they could be screwed in. The shoulder was the problem. It kept the disc from going on all the way on the hub. If the lathe I ordered had come in I would have set up each stud and cut the outer shoulders on an angle. So the only way to solve the problem was to countersink the stud holes on the discs. After I countersunk the discs I mounted them back on the hubs ,bolted them on, and checked the runout again. Each one was .001". So tomorrow I'm going to pull the front wheels and check the runout of the discs and repair them if needed. I just had alignment done but, now I’ll have to have it rechecked.
Attachments
countersunk holes.JPG
countersunk holes.JPG (149.97 KiB) Viewed 106 times
studs.JPG
studs.JPG (135.82 KiB) Viewed 106 times
inner wear pattern.JPG
inner wear pattern.JPG (157.77 KiB) Viewed 106 times

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texanbrit
Posts: 629
Joined: Wed Sep 19, 2018 11:01 pm
Location: Conroe, TX
Your Car's Year / Make / Model: 2013 500c Abarth
Your Instagram (Optional): paul_rogerson_tx
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Re: Otis Wheel Studs

Post by texanbrit » Sat Apr 03, 2021 8:55 pm

Brake performance rotors? Mine seem to have worn pretty evenly, but now I want to go check them again :)
2013 Abarth 500c (NGen Turbo'd) - Isabella
2012 500 Pop (stockish fauxbarth) - Popabella
2014 500L (just starting) - The Hulk
1971 850 Sport Spider (what was I thinking) - No name yet

sportfan
Posts: 219
Joined: Thu Sep 20, 2018 11:33 pm
Location: Ponca City, Ok.
Your Car's Year / Make / Model: 2013 Fiat 500 Sport

Re: Otis Wheel Studs

Post by sportfan » Sun Apr 04, 2021 8:49 pm

The disc are the ones I won at Twisted last year. Bryan could tell you the maker , I've long thrown the boxes away.

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texanbrit
Posts: 629
Joined: Wed Sep 19, 2018 11:01 pm
Location: Conroe, TX
Your Car's Year / Make / Model: 2013 500c Abarth
Your Instagram (Optional): paul_rogerson_tx
Contact:

Re: Otis Wheel Studs

Post by texanbrit » Sun Apr 04, 2021 10:09 pm

Also my studs don't look like that (I think). At least visually they are black and not stepped at the end.
2013 Abarth 500c (NGen Turbo'd) - Isabella
2012 500 Pop (stockish fauxbarth) - Popabella
2014 500L (just starting) - The Hulk
1971 850 Sport Spider (what was I thinking) - No name yet

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