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Modern tranny sprocket seal

Moderators: Curt!, Pa

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Hopper

Posts: 35

Joined: Wed Jan 20, 2010 9:52 pm

Post Mon Jun 27, 2011 8:33 pm

Modern tranny sprocket seal

Is there a modern lip seal available to fit the gearbox output sprocket on my 42WLA?
Or are we stuck with the old leather ring?
Anyone happen to know a size or number so I can check if my local bearing shop has one before I pull the sprocket off?
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Pa

Site Admin

Posts: 4652

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Mon Jun 27, 2011 9:53 pm

Re: Modern tranny sprocket seal

If your oem seal is leaking bad, it is most likely because the seal is dry rotted and cracked... or the mainshaft races outer drive sprocket seal surface is deeply grooved through many years of use. NOS oem seals are still very good if warmed up good before installing the sprocket onto the mainshaft. I now heat them up to roughly 175 degrees before installing them. The heat seems to make them plyable again.
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Hopper

Posts: 35

Joined: Wed Jan 20, 2010 9:52 pm

Post Tue Jun 28, 2011 12:28 am

Re: Modern tranny sprocket seal

Pa wrote:If your oem seal is leaking bad, it is most likely because the seal is dry rotted and cracked... or the mainshaft races outer drive sprocket seal surface is deeply grooved through many years of use. NOS oem seals are still very good if warmed up good before installing the sprocket onto the mainshaft. I now heat them up to roughly 175 degrees before installing them. The heat seems to make them plyable again.


That is interesting. Do you heat them up in oil presumably?

Still would like to find a standard seal as parts take 3-4 weeks to get from the US to the remote part of Oz where I live, but we have a local bearing supplier with a good stock of lip seals.
I am sure my old seal has suffered some rot - it has been in there since I restored the bike 38 years ago.
Just pulled her out of my late father's shed recently and am trying to breathe a bit of life back into the old girl, on a really limited budget both time and money wise.

Not sure how to post pics but I'll give it a try:
Then
Image

Now:
Image
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amklyde

Posts: 624

Joined: Fri Dec 19, 2003 1:01 am

Location: Wisconsin, USA

Post Tue Jun 28, 2011 6:19 am

Re: Modern tranny sprocket seal

I think it's great you've hung on to the motorcycle. You and the machine don't seem to have changed much. Enjoy the ridin'. I'll look to see if the aftermarket seals I have are numbered.
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dalaymond

Posts: 304

Joined: Mon Oct 25, 2004 12:01 am

Location: Jonesville, Louisiana, USA

Post Tue Jun 28, 2011 8:01 am

Re: Modern tranny sprocket seal

Nice bike, Hopper. I recently had to change my tranny sprocket seal for the same reason, dry rotted.
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Pa

Site Admin

Posts: 4652

Joined: Sun Mar 12, 2000 1:01 am

Location: Ohio USA

Post Tue Jun 28, 2011 8:49 am

Re: Modern tranny sprocket seal

Very nice bike ! You have just the Bro in your neck of the woods [Australia]. Email Tony at redfernmotorparts@bigpond.com . I am certain Tony will have the nos seals. Ask for an nos sprocket instead of just the seal. The seal will already be installed in the nos sprocket. To answer your warming of the seal question....no....I do not warm them in oil. The nos seals, and or the nos sprockets, are coated in cosmoline, and.... to remove the vast majority of this preservative, the heat accomplishes that task and simultaniously enhances the softening process to boot.
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dalaymond

Posts: 304

Joined: Mon Oct 25, 2004 12:01 am

Location: Jonesville, Louisiana, USA

Post Tue Jun 28, 2011 9:02 am

Re: Modern tranny sprocket seal

Pa wrote:Very nice bike ! You have just the Bro in your neck of the woods [Australia]. Email Tony at redfernmotorparts@bigpond.com . I am certain Tony will have the nos seals. Ask for an nos sprocket instead of just the seal. The seal will already be installed in the nos sprocket. To answer your warming of the seal question....no....I do not warm them in oil. The nos seals, and or the nos sprockets, are coated in cosmoline, and.... to remove the vast majority of this preservative, the heat accomplishes that task and simultaniously enhances the softening process to boot.


Cool.
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Hopper

Posts: 35

Joined: Wed Jan 20, 2010 9:52 pm

Post Tue Jun 28, 2011 8:09 pm

Re: Modern tranny sprocket seal

amklyde wrote:I think it's great you've hung on to the motorcycle. You and the machine don't seem to have changed much. Enjoy the ridin'. I'll look to see if the aftermarket seals I have are numbered.


Thanks.
Mmmm, but like the bike, I am bit tireder in the second pic. :wink:
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amklyde

Posts: 624

Joined: Fri Dec 19, 2003 1:01 am

Location: Wisconsin, USA

Post Wed Jun 29, 2011 7:29 am

Re: Modern tranny sprocket seal

I couldn't find any sprocket seals in my 45 stuff, just clutch gear seals, no numbers. The bearing supply outfits usually have seals listed by dimension in their catalogs so if you had a way to measure the od of the boss on the side cover and the id and depth of the counterbore in the sprocket, you should be able to purchase a seal.
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RUBONE

Posts: 380

Joined: Fri Nov 30, 2007 7:24 pm

Post Wed Jun 29, 2011 5:29 pm

Re: Modern tranny sprocket seal

The stock sprockets have a seal retainer in them, a stamped steel shim of sorts. Why, who knows, perhaps a change in seal standardization or such. I would not worry about the OD, find a seal that fits the boss on the end cover and make your own "seal retainer" to fit the OD to the sprocket.
Robbie
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Hopper

Posts: 35

Joined: Wed Jan 20, 2010 9:52 pm

Post Wed Jun 29, 2011 8:40 pm

Re: Modern tranny sprocket seal

RUBONE wrote:The stock sprockets have a seal retainer in them, a stamped steel shim of sorts. Why, who knows, perhaps a change in seal standardization or such. I would not worry about the OD, find a seal that fits the boss on the end cover and make your own "seal retainer" to fit the OD to the sprocket.
Robbie


That is probably what I will end up doing. I have access to a lathe.
Guess I have gotten spoilt over the years riding modern bikes and just can't tolerate oil patches on the garage floor. Even my Ironhead is not allowed to do that.
Though, the old Walla is something special.
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ozihotrod

Posts: 70

Joined: Mon Apr 17, 2006 9:13 pm

Location: South Australia

Post Wed Jun 29, 2011 10:26 pm

Re: Modern tranny sprocket seal

:shock: My goodness you washed the old girl, must be first time yeeeears, looks good, big red is near on all done.
" The more I learn the less I know"

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