Author Topic: Rear Hub seal on S3?  (Read 663 times)

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Rear Hub seal on S3?
« on: 19 April 2013, 02:44:23 pm »
Hello,

I'm new on here and have a question. I have a 109 S3 and an issue with the rear hub leaking oil. Is this the hub seal failed and if so how urgent is it to fix? Will a couple of weeks (or approx 50 miles) do or is it an urgent job?




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Bill

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Re: Rear Hub seal on S3?
« Reply #1 on: 19 April 2013, 03:29:14 pm »
better to do sooner rather than later as the oil will be all over the drum and shoes not just the outside, it dosnt take long and saves wasting oil aswell.
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Re: Rear Hub seal on S3?
« Reply #2 on: 19 April 2013, 03:32:04 pm »
First thing I'd check would be the axle breather to make sure it's not blocked (unscrew it and give it a shake, you should be able to hear the ball bearing, if not wash it in a solvent of your choice), if it is blocked then when the diff warms the increase in internal pressure can blow the oil past the seal. Mine weeps very very slowly, nowhere near as bad as yours, maybe a teaspoon of oil gets out every 4-6 months but the hub cap traps it.  As a temporary fix you could try pulling off the hub cap (it may be filled with oil so be prepared to catch it!), cleaning it up and then run a bead of hylomar instant gasket stuff round the edge when you refit it.  If you have blown a seal there I'd also check inside the brake drum just to make sure you're not leaking onto the brake shoes too.

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Re: Rear Hub seal on S3?
« Reply #3 on: 19 April 2013, 03:57:27 pm »
Thank you very much for the fast replies. Great advice too, it only really happens on longer runs (20 - 25 miles) too so the blocked breather could well be the culprit. Thanks guys I'll get on it at the weekend.

Bill

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Re: Rear Hub seal on S3?
« Reply #4 on: 19 April 2013, 04:28:59 pm »
Its an easy job and the parts are cheap, get it done as soon as you can, bearings and diffs are alot more coin and hassle.

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Re: Rear Hub seal on S3?
« Reply #5 on: 19 April 2013, 04:44:13 pm »
First thing I'd do is to tighten up the drive flange bolts and see if it stops leaking
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Re: Rear Hub seal on S3?
« Reply #6 on: 19 April 2013, 04:50:29 pm »
First thing I'd do is to tighten up the drive flange bolts and see if it stops leaking

^^^This. Also if that's a very late SIII with the plastic hub caps like the boingy ones I'd check to see if it hasn't perished and ****.
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Re: Rear Hub seal on S3?
« Reply #7 on: 20 April 2013, 08:04:24 am »
Thanks again for all the advice. Sadly I have no idea on its actual age as it was on a 2A V5 when I got it. Is there a way to date it without a vin?

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Re: Rear Hub seal on S3?
« Reply #8 on: 20 April 2013, 08:06:57 am »
It's definately a plastic cap on the hub- so check that first.

For dating, decent photos of the inside and out will help us give a pretty good stab at the date.
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Re: Rear Hub seal on S3?
« Reply #9 on: 20 April 2013, 08:56:32 am »
Thanks, I'll get some photos up.

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Re: Rear Hub seal on S3?
« Reply #10 on: 20 April 2013, 09:32:50 am »
They look like 2a studs/wheel nuts
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Re: Rear Hub seal on S3?
« Reply #11 on: 20 April 2013, 01:00:32 pm »
Hello,

I'm new on here and have a question. I have a 109 S3 and an issue with the rear hub leaking oil. Is this the hub seal failed and if so how urgent is it to fix? Will a couple of weeks (or approx 50 miles) do or is it an urgent job?




Thanks

Bill

That's not. Hub seal leak

It's a leak between the hub and drive flange.
Easiest fix, try nipping up the 6 bolts, they often come slack
If that doesn't work then remove and fit a new gasket. (Note if you remove the halfshaft comes with it. Thus you loose the handbrake, so chock the vehicle)

There is a felt washer under the hub cap nut that can leak, or on very late ones a o-ring they rarely leak, unless a po has messed about

My money is on slack nuts n the hubs


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Re: Rear Hub seal on S3?
« Reply #12 on: 22 April 2013, 07:58:05 am »
Thanks for the advice again. i will get at it I hope this week and see whats going on. 

Following on from my query as to the actual age of my S3 and the offer to id it from photos, here they are.

I assume its a mid 70's model but it's a wild guess based on nothing.











Hope you can age it from these, it's on a 1962 S2a V5 I assume to avoid VED (it was already like that when I bought it).

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Bill

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Re: Rear Hub seal on S3?
« Reply #13 on: 22 April 2013, 08:57:20 am »
well it has the later bulkhead with the complete drip rail small dash vents and speedo trip. also no factory fog light, centre switch panel fitted with hazards. looks like it had a full canvas at some point im no expert but id like to have a stab at 1978 to 1980.
looks like it could be ex military, with a strange rear cross member or is there something i dont know, looks like military ends with civilian centre :-?
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Re: Rear Hub seal on S3?
« Reply #14 on: 22 April 2013, 09:17:39 am »
I bought it from a friend about a year ago who bought it from a guy in Leeds off ebay about 3 years ago. That guy said it might be ex-MOD and the springs are so F***ing hard! Unlike anything I've experienced before, my old 88 inch S2a was like a jag compared to this so could that be another pointer towards MOD?