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 Front wheel bearing seals
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melle
V4 Guru

United Kingdom
3830 Posts

Posted - 27 Aug 2018 :  21:01:55 Show Profile Reply with Quote
Does anyone happen know what the dimensions of the front wheel bearing inner seal are?

The outer is 50-70-10/8, what does the 10/8 denomination mean? I asked my father in law who has been working in the industrial power transmission industry for a couple of decades, but he'd never seen it before. I have a double lip 50-70-10 seal I trust will work just fine, but I'm curious now.

www.saabv4.com

Edited by - melle on 27 Aug 2018 21:02:27

stevebod
V4 Fanatic

United Kingdom
416 Posts

Posted - 28 Aug 2018 :  08:21:59 Show Profile Reply with Quote
Hi Melle,
I don't know either but could it be an alternative size? Were there two housing used or something like that, which mean a 10mm or 8mm thick seal is needed depending on the situation?
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StefanM
Starting Member

Sweden
34 Posts

Posted - 28 Aug 2018 :  09:35:10 Show Profile Reply with Quote
It is a seal that have two different heights. Saab used similar seals on the transmission also. Lied flat on a surface the outer edge is 8mm. Measured at the liparea it is 10mm.
Most often replaced by standard 50-70-10.
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melle
V4 Guru

United Kingdom
3830 Posts

Posted - 28 Aug 2018 :  12:40:40 Show Profile Reply with Quote
Steve, it's the size on the actual seal. Thanks Stefan, that makes sense! Will take a hub apart to check the rear seal dimensions and post here for future reference.

www.saabv4.com
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melle
V4 Guru

United Kingdom
3830 Posts

Posted - 28 Aug 2018 :  18:59:07 Show Profile Reply with Quote
Inner is 42x65x10. I have difficulty locating the correct type seals for this application online, will contact a local real world supplier.

www.saabv4.com
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melle
V4 Guru

United Kingdom
3830 Posts

Posted - 29 Aug 2018 :  18:21:14 Show Profile Reply with Quote
Haven't found any seals for automotive applications, so I ordered SKF industrial seals which are rated for a much lower rpm. Will see what happens.

www.saabv4.com
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beardydave
V4 Fan

124 Posts

Posted - 29 Aug 2018 :  20:21:53 Show Profile Reply with Quote
Might be able to get round that with material choice. What material did you go for on the industrial seal?

If the seal is static it wont centrifuge out from the shaft and let grease out. If its shaft mounted you could hve problems.
If you run faster than rated sliding contact speed it will heat up more and degrade the material faster. Possibly even on first use.
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melle
V4 Guru

United Kingdom
3830 Posts

Posted - 29 Aug 2018 :  20:46:05 Show Profile Reply with Quote
That's what I fear. I bought a nitrile seal, viton seals are bloody expensive and I'm not sure they would do the job either if rated for lower rpm.

www.saabv4.com
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RhysN
V4 Fanatic

United Kingdom
411 Posts

Posted - 30 Aug 2018 :  07:21:23 Show Profile Reply with Quote
What revs are those industrial seals rated to Melle? The ones I found have a rotational speed of 30 metres/second, and up to 200 degrees C.

Edited by - RhysN on 30 Aug 2018 07:25:43
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melle
V4 Guru

United Kingdom
3830 Posts

Posted - 30 Aug 2018 :  09:02:08 Show Profile Reply with Quote
10m/s and up to 100 degrees C or 120 peak is what I could get locally (in NL). 100mph is about 45m/s. A well greased bearing shouldn't get hot I'd say, but friction on the seal surface may be an issue.

I'm not sure what type of seal you get with new bearings, but I do know from experience they're absolute sh!te. Some of the bearings currently available seem to be of the 2r type (rubber seal both sides) which removes the need for an external seal. I'm using a complete hub with a good used bearing that I've washed out and repacked with grease.

What did you find?

www.saabv4.com
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melle
V4 Guru

United Kingdom
3830 Posts

Posted - 17 Jan 2019 :  19:03:48 Show Profile Reply with Quote
quote:
Originally posted by melle
Will see what happens.
I took the old hub apart; the lips on the outer seal had completely worn away, resulting in the grease leaking out and the bearing starving of lubrication. I've fitted that seal in 2011 and it has done about 17000km before it failed. The other side has the same seal fitted and so does the hub I just installed, this was the last of my stock. I'll keep an eye on the other side and expect to be doing this one again in a few years' time.

If anyone knows where to get decent quality seals for this application, please give me a shout, I can do with four of each.

Inner: 42-65-10
Outer: 50-70-10
Permissible rotational speed min 45m/s

www.saabv4.com
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