Teardown progress - main seal removal - BMW Luxury Touring Community
 
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post #1 of 4 Old Feb 17th, 2008, 9:11 am Thread Starter
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Location: leeds, , uk
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Teardown progress - main seal removal

Today I decided to remove the main seal. My replacement seal is on order so I couldn't go much further.

The photos show how I drilled the old seal surface and then screwed a self tapping screw into the hole. The screw was attached to a slide hammer. On the second hammer attempt the seal popped out.

Photos also show my cleaned up tranny with new input shaft seals fitted. One on the clutch side and the other on the same shaft but on the slave cylinder side.

I will replace the main seal by pressing it into place by re-fitting the clutch housing and screwing on the nut.

In case this does not push the seal level with the surface I have made a white plastic spacer. I will press the seal in almost fully then remove the housing and fit my spacer. A further screw down will use the spacer to press the seal home (upper seal-surface level with seal-housing upper surface as per old seal)

FWIW the old seal lip had very little flexibility and felt quite hard unlike the lips of the new seals which I placed in the tranny.

The replacement tranny seals appeared to be different to those replaced. The new ones were brown in colour and the clutch-side seal had a felt upper surface which was not on the leaking original. Hopefully this represents an improvement on the originals.
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post #2 of 4 Old Feb 17th, 2008, 9:25 am Thread Starter
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Re: Teardown progress - main seal removal

Remaining photos here
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post #3 of 4 Old Feb 17th, 2008, 9:39 am
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Re: Teardown progress - main seal removal

Looks like you're having all the fun!
Was the seal leaking or is this something you're doing while addressing another problem?

Good luck with it.

Rodney

2000 Canyon Red LT [I]
2005 Sportster XLCH 1200C
2006 Mongoose XR250
Make sure your Life Assurance is prayed up. Don't leave home without it.
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post #4 of 4 Old Feb 17th, 2008, 10:11 am Thread Starter
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Re: Teardown progress - main seal removal

Hi Rod

The seal had been leaking for the last 18 months but I deliberately kept the engine oil on the low side which seemed to stop it progressing. There were minimal signs of recent leaking when I removed the clutch housing.

However, when I started to remove the transmission there was the unmistakeable smell of tranny fluid which was leaking from the input shaft. I was lucky that this had not contaminated the clutch.

It seems that an engine oil leak from the main engine seal is more of a nuisance than an immediate threat and it is unusual for this to contaminate the clutch because of its position behind the clutch housing. The item that does cause engine oil to contaminate the clutch is the failure of a small rubber O ring between the engine and the clutch. If this fails it allows oil to run right into the heart of the clutch. Not good as these are meant to be dry clutches unlike many used on Jap bikes.

Regards

Chris
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