Oil seals

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tomh
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Oil seals

Post by tomh » 03 Jan 2008, 15:17

After accidentally overfilling the gearbox oil i appear to have a leak in the front sprocket/gear selector area. I have got replacement seals, how easy are they to fit?
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Jonorow
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Re: Oil seals

Post by Jonorow » 04 Jan 2008, 13:51

very easy....
1 - remove sprocket,
2 - Take small screwdriver and knock it at right angles to the seal,
3 - Simply flick out.
4 - To replace, wrap some tape arounf the shaft and slide the seal into the housing.
5 - Using a suitable press (large socket) drive the seal untill it is seated, you may even be able to push it in . **Dont hit too hard as you may damage the seal!**
Jon
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Re: Oil seals

Post by tomh » 04 Jan 2008, 15:21

Ideal thanks for that, is the gear selector seal as simple?
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Re: Oil seals

Post by Jonorow » 04 Jan 2008, 15:38

yep exactly the same. just remember the tape or you will trash your new seal. Jon
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Re: Oil seals

Post by tomh » 04 Jan 2008, 16:13

what do you mean by tape?
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Fossil
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Re: Oil seals

Post by Fossil » 04 Jan 2008, 19:06

The splines on the shafts act like little knives on the lips of the seals. Just cover the splines with a layer of insulation tape. Then lightly oil the tape with clean oil and the new seals will pop straight over the shaft with no damage. :D :D
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tomh
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Re: Oil seals

Post by tomh » 04 Jan 2008, 23:17

I just replaced the sprocket seal even though it appeared fine, there were no sharp bits on this. When i tapped it back in it went back further than the old seal, its now 4-5mm down from the edge of the casing, is this too far?
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Re: Oil seals

Post by andypugh » 05 Jan 2008, 00:31

tomh wrote: its now 4-5mm down from the edge of the casing, is this too far?
Try it and see, as I can't imagine it being easy to get out again.

In the case of a crank seal, pushing it in too far is bad as it blocks the oil feed to the bearing (IIRC). I don't think you will get anything worse than a not-sealing-seal in the case of the output shaft seal.
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Re: Oil seals

Post by tomh » 05 Jan 2008, 10:06

it wasnt easy to get out in the first place, it was in solid and i had to butcher a bearing puller to remove it with. I have started the bike up without the front sprocket on and it hasnt leaked yet
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Re: Oil seals

Post by tomh » 05 Jan 2008, 23:25

Just re read this thread, i replaced the big rubber seal that goes aound the sprocket housing, between this and the shaft there is a round metal bush that has a thin rubber seal in the back of it, is this another seal that i should have repalced?
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