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ST Dog
Samba Member
Joined: March 06, 2018
Posts: 81
Location: Rocket City USA
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 Posted: Fri Dec 03, 2021 11:12 pm Post subject: rear wheel bearing oddity |
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Replacing the rear bearings in my '71 SB. The right rear wheel moved in and out 1/8-1/4" making a loud thumping noise when under load.
Once I got the outer bearing out I noticed the inner bearing us a roller bearing instead if a ball bearing.
I can get the number but it's a FAG bearing made in Germany.
Not sure how that ever worked. What would keep the stub axle in place and prevent in/out movement?
The outer bearing is also a roller but no markings (no number or manufacturer).
Also have trouble getting the inner race from that odd bearing off the axle. It's seized. The spacer turns freely but I can't budge the inner race. Of course it's hardened so I can't grip it with any tools.Going to try heat tomorrow.
Last edited by ST Dog on Sun Dec 05, 2021 3:31 pm; edited 1 time in total |
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Dan the workingstiff
Samba Member
Joined: July 03, 2006
Posts: 824
Location: Downriver, MI
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| Posted: Sat Dec 04, 2021 2:20 pm Post subject: Re: reared wheel bearing oddity |
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Was the picture taken before you removed the c-clip?
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ST Dog
Samba Member
Joined: March 06, 2018
Posts: 81
Location: Rocket City USA
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| Posted: Sat Dec 04, 2021 5:24 pm Post subject: Re: rear wheel bearing oddity |
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| Dan the workingstiff wrote: |
| Was the picture taken before you removed the c-clip? |
Yes, as you can see the snap ring still in place in the 2nd picture.
For the first pic I believe the seal was still in.
I knew something was odd when the inner race came out with the stub shaft.
So has anyone seen roller bearings for the inner as well?
I just don't see how that could work, but I've put 15k miles on it like that (it came to me like that and I'm just now doing the rear bearings and seals)
I have taken the other side apart yet.
Also how tight should the inner race of the inner bearing be on the stub shaft? Any one have the shaft dimensions where the unnerving races ride?
Mine seem way to tight, even after cleaning it up. I needed heat to get the old race off and the new ones are just as tight, if not tighter. No dry fitting these things. The outer bearing and the spacers fit over easily. I'm wondering if these bearings are out of spec, or even the shaft.
Last edited by ST Dog on Sun Dec 05, 2021 3:33 pm; edited 1 time in total |
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60ragtop
Bonneville Belt Bitch
Joined: March 13, 2006
Posts: 7800
Location: Big Wonderful WYO 82401
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ST Dog
Samba Member
Joined: March 06, 2018
Posts: 81
Location: Rocket City USA
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| Posted: Sat Dec 04, 2021 9:13 pm Post subject: Re: rear wheel bearing oddity |
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Those both show ball bearings for the inner bearing.
I already searched. Read a dozen threads. None address my question.
What I found in the car was a ROLLER bearing for the inner bearing.
See the snap ring against the roller in the second picture?
And yes another roller bearing for the outer bearing.
Last edited by ST Dog on Sun Dec 05, 2021 3:34 pm; edited 1 time in total |
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Q-Dog
Samba Member
Joined: April 05, 2010
Posts: 8700
Location: Sunset, Louisiana
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| Posted: Sun Dec 05, 2021 7:17 am Post subject: Re: reared wheel bearing oddity |
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None of the hacks people do/did to these cars surprises me any more. They are probably the most modified car ever manufactured.
All you can do is get the correct parts and hope whoever worked on the car didn't modify the trailing arms and axles to make the other stuff fit.
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'69 Dune Buggy
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runamoc 
Samba Member
Joined: June 19, 2006
Posts: 5601
Location: 37.5N 77.1W
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| Posted: Sun Dec 05, 2021 8:03 am Post subject: Re: reared wheel bearing oddity |
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outer bearing
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ST Dog
Samba Member
Joined: March 06, 2018
Posts: 81
Location: Rocket City USA
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| Posted: Sun Dec 05, 2021 9:11 am Post subject: Re: rear wheel bearing oddity |
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Photos later, my phone isn't cooperating.
The inner bearing says FAG, Germany, with 527539 on both races.
13 rollers in a black plastic cage.
The outer has no marking, a metal cage and 12 rollers.
The outer races seem the same diameter and the inner races with both fit either outer.
I'm still befuddled as to how it ever worked and kept the drum/wheel in place. Yet I drove it over 15k miles like that with no issues. And who knows how much the previous owner drove. Rear bearings were not something he mentioned doing on it.
But that raises the question, how easily should the CV joint move in and out? I get no axial play, which is all I've ever checked on other CVs
Last edited by ST Dog on Sun Dec 05, 2021 3:35 pm; edited 1 time in total |
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67rustavenger
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Joined: February 24, 2015
Posts: 9770
Location: Oregon
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| Posted: Sun Dec 05, 2021 9:30 am Post subject: Re: reared wheel bearing oddity |
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This is a simple case of two different style bearings installed on your car, years ago.
Both bearings will work as designed. Even if, mixed and matched. They still work.
Unless you're concerned that the judge at the Concours De Elegance is gonna make you pull a brake drum and bearing cover. No one but you and will ever know what's in the rear axle housing.
If it still bothers you. Buy a new set of axle bearings and install them for piece of mind at the aforementioned car show! 
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ST Dog
Samba Member
Joined: March 06, 2018
Posts: 81
Location: Rocket City USA
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| Posted: Sun Dec 05, 2021 10:52 am Post subject: Re: rear wheel bearing oddity |
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| 67rustavenger wrote: |
This is a simple case of two different style bearings installed on your car, years ago.
Both bearings will work as designed. Even if, mixed and matched. They still work.
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Well since it's a ROLLER bearing for the inner bearing I do care.
Nothing to do with judges, it's about proper functionality.
The point of the number for this mystery bearing is to see where it's suppose to go. It sure isn't the inner bearing as that should be a BALL bearing.
And this all started because the stub shaft had play in and out.
I am installing the proper ball bearing in the inner position and roller bearing in the outer position.
Last edited by ST Dog on Sun Dec 05, 2021 3:35 pm; edited 1 time in total |
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74 Thing
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ST Dog
Samba Member
Joined: March 06, 2018
Posts: 81
Location: Rocket City USA
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| Posted: Mon Dec 06, 2021 3:45 pm Post subject: Re: rear wheel bearing oddity |
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| ST Dog wrote: |
Photos later, my phone isn't cooperating.
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So here's the FAG bearing that was installed as the inner bearing.
Part number search finds it's supposed to be the outer bearing and was just installed in the wrong place.
And this was installed as the outer bearing. Unknown make/PN.
The week of Christmas I'll do the other side and see if it's similar.
I just don't see how those two roller bearings ever worked.
The only thing that would limit inward movement would be the drum against the backing plate and the shoes.
But I don't see any wear that would indicate that.
But it's all back together with correct bearings and no movement in/out on the shaft (nor with the wheel installed)
Still just perplexed as to how the old parts ever worked and why they were ever installed that way. |
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ST Dog
Samba Member
Joined: March 06, 2018
Posts: 81
Location: Rocket City USA
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| Posted: Mon Dec 06, 2021 4:31 pm Post subject: Re: reared wheel bearing oddity |
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| Q-Dog wrote: |
None of the hacks people do/did to these cars surprises me any more. They are probably the most modified car ever manufactured.
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Agree, lots of odd things done over the years.
I'm just puzzled as to how it ever worked.
A custom shop near me said they had seen it in the past, but no clue how it worked either.
Thankfully it didn't mess anything up and I could install the correct bearing in the correct places. |
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ST Dog
Samba Member
Joined: March 06, 2018
Posts: 81
Location: Rocket City USA
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| Posted: Thu Dec 30, 2021 2:57 pm Post subject: Re: rear wheel bearing oddity |
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Just a follow up. The other side (driver) had the correct bearings in the correct place. The seals were shot though.
Since I already had the parts I replaced that side. At least it matches.
And I'll keep the ones I removed as spares incase I need them later.
Clean them up good and lightly grease before storing. |
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