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Old 06-18-2013, 04:17 AM   #1
Malindi OP
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Final drive leak on a single side swing arm Airhead (R80G/S)

Hi guys,

I am looking for some info on how to deal with a final drive leak (the big seal) on my R80G/S. All I find is info twin shock bikes. Even Snowbum doesn't have any info. I can see the seal ... can I just yank it out (how?) and replace it with the new one?

I'm in Thailand, so have limites access to shops but BMW is getting me the part in two days for $25, so not too bad.

If anyone in Chiang Mai has some shop space...

Thanks
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Old 06-18-2013, 06:21 AM   #2
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Really easy. Just poke a hole (or a few) in the seal and give it a few good tugs with a seal puller or other hook-like implement and it should come out without too much of a fight. I believe I banged my last one in with the butt of a screw driver. Easy peezy. No shop space necessary. You can do this one on any sidewalk in about 10 minutes if you have the right puller.

You want the one on the left/top or something similar:

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Airhead Wrangler screwed with this post 06-18-2013 at 06:44 AM
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Old 06-18-2013, 08:05 AM   #3
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Quote:
Originally Posted by Airhead Wrangler View Post
Really easy. Just poke a hole (or a few) in the seal and give it a few good tugs with a seal puller or other hook-like implement and it should come out without too much of a fight. I believe I banged my last one in with the butt of a screw driver. Easy peezy. No shop space necessary. You can do this one on any sidewalk in about 10 minutes if you have the right puller.

You want the one on the left/top or something similar:


Phew, thanks, that makes me feel better ... :-)
Is there space behind the seal to indent it a bit inwards, as you can with a rear main seal? I don't want to damage anyhting behind it...
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Old 06-18-2013, 08:05 AM   #4
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Quote:
Originally Posted by Airhead Wrangler View Post
Really easy. Just poke a hole (or a few) in the seal and give it a few good tugs with a seal puller or other hook-like implement and it should come out without too much of a fight. I believe I banged my last one in with the butt of a screw driver. Easy peezy. No shop space necessary. You can do this one on any sidewalk in about 10 minutes if you have the right puller.

You want the one on the left/top or something similar:

Also, is there an edge it seats to or do I need to eyeball it for flushness?
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Old 06-18-2013, 08:53 AM   #5
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Originally Posted by Malindi View Post
Also, is there an edge it seats to or do I need to eyeball it for flushness?
Aw, crap. I don't remember exactly what's behind that seal. I can't remember if it bottoms out on something or not. Take a photo of your current seal and then pull it out. You'll see what's inside and if there isn't anything that the seal runs into you can at least set the new one to the same-ish depth based on your photo.
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Old 06-18-2013, 09:05 AM   #6
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Really easy. Just poke a hole (or a few) in the seal
You mean in the seal lip? I would imagine the seal itself is too tough..?
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Old 06-18-2013, 09:15 AM   #7
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You mean in the seal lip? I would imagine the seal itself is too tough..?
No, you should be able to puncture the seal itself, just be careful not to go too deep as OLH warns above. I wouldn't try hooking anything under the lip for fear of putting a scratch in the sealing surface. Just poke a hole in it toward the outer edge with something sharp and skinny and then pull it.
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Old 06-18-2013, 09:30 AM   #8
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Thanks guys .. I should get the seal on Thursday. Will report back here.
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Old 06-18-2013, 09:40 AM   #9
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Until then, I would just take the blunt side of a knife with some thin cloth over it and sweep out the seal area. Might be all you need.
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Old 06-18-2013, 06:32 AM   #10
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look here if you want to take it all appart
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Old 06-18-2013, 08:14 AM   #11
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Yikes! No, I don't want to do that with just a tool kit ... :-)
I'll go take a hard look at it tomorrow morning and see what size of puller I can source here.
Thanks guys!
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Old 06-18-2013, 09:45 AM   #12
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Originally Posted by Malindi View Post
Yikes! No, I don't want to do that with just a tool kit ... :-)
I'll go take a hard look at it tomorrow morning and see what size of puller I can source here.
Thanks guys!
If you can't source a real puller, I've had success using a small drill to make a pilot hole and then driving a drywall screw into the seal. Three screws, 120deg apart and pull on them with pliers a little bit at a time. Use a block of wood as a seal driver and just work your way around as you tap it in.
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Old 06-18-2013, 11:18 PM   #13
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I think I'll be able to source a puller here. I took a closer look this morning and cleaned everything up afterwards.

This is the leak:



Notice the small puddle and streaming oil around the tire.

The entire circumference of the final drive had signs of oil. The top vent stuff is not oil, it's old oil and dirt mixed.



Inside of the wheel. Next to no oil. Shoes and running surface was dry.



It looks like the oil came from around the seal. Noticed it dripped all down.



After cleaning it up, I pushed back the seal a bit as Anton suggested. You can see there is some gunk build up right where the seal needs to run.



Upon closer inspection, I could see some jagged edges on the lip of the seal near the running surface. I think the heat/not riding combo maybe deadly here and probably deteriorates rubber at a much higher pace than normal. It's been 96 to 105 here over the last few weeks/months where I am ...

Tomorrow I should get the seal. I'm going to an outfit called Riders Corner here, run by a Brit. It's a motocycle hangout/hotel/bar/tour company. The guy seems nice, I bought a Laos map from him the other week. I'll ask him where I can do some maintenance etc. on the bike. I think it needs some TLC badly.

To be continued.
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Old 06-18-2013, 11:56 PM   #14
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I am leery of advising using a drill. I have seen some seriously F'ed up stuff for that!! A plain old seven dollar seal puller from your local car parts store works perfectly. Then you can use that same puller on just about every seal on the bike and then some. I have two or three modified for particular seals. They work great and are cheap.
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Old 06-19-2013, 06:48 AM   #15
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Quote:
Originally Posted by Malindi View Post



The entire circumference of the final drive had signs of oil. The top vent stuff is not oil, it's old oil and dirt mixed.


.
Check the breather is clear.
If not high temp can overpresurise the drive and cause the leak.
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