Drive shaft boot leak - K-Bikes.com - Excellence in Motion
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post #1 of 17 (permalink) Old Aug 12th, 2007, 3:51 pm Thread Starter
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Drive shaft boot leak

It doesn't leak leak but weeps. I though oil shouldn't get to where this rubber boot is and the boot is there just to protect shaft from dust and water.

Anyway, does it indicate that I need to replace just a clamp or that some seal gave up inside and I have to disassemble rear drive to fix it?
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post #2 of 17 (permalink) Old Aug 12th, 2007, 5:06 pm
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Yes you're right, the boot is there to keep the water/dust out and should be dry.

Unfortunately, if either the pinion oil seal on the rear drive or the transmission output shaft seal leaks, the only place for oil to go is inside the boot. It's the Beemer way of giving you early warning that a big repair bill is ahead!

Keep checking the rear drive and transmission oil levels whilst riding on borrowed time. The leak will get worse, empty out the oil and see how much you've got. A tablespoon is early days, half a cup full is time to stop riding and get the bike fixed.

Now you're going to ask which seal is leaking. That's a tricky one to answer, but it gets easier to answer when more oil starts coming through.



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post #3 of 17 (permalink) Old Aug 12th, 2007, 6:24 pm
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more seal problems

same thing happened to me. u will need a teardown, replace clutch seals, and main engine seal while u are in there. probably $1500 job. i had mine done under warranty. i was lucky. i personally think bmw should have had a recall for 02-04kgt for resealing, but they didnt. next bike will be a honda, case closed.
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post #4 of 17 (permalink) Old Aug 12th, 2007, 8:32 pm
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oil

I know you have already checked it, but mine did this simply because I put in too much oil.. I let some out of the diff, rode 2000k home, no leak.
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post #5 of 17 (permalink) Old Aug 13th, 2007, 3:03 pm
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Looks more like road grime or contamiated gear oil....smell like gear oil?.....I would clean it off and run it and check again....make sure your breather vent is clear on your final drive and make sure its not allowing water to get in....if it gets crud in there the expantion from the heat could make your seal leak and not allow the breather to let the expantion to escape and if its allowing water in then you have an over fill problem because of the added water......good luck!

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post #6 of 17 (permalink) Old Aug 13th, 2007, 7:04 pm Thread Starter
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Quote:
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I would clean it off and run it and check again....
I cleaned it and in 500 miles it showed up again.
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post #7 of 17 (permalink) Old Aug 14th, 2007, 6:09 am
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Have you actually taken the clips off and looked inside to see how much is in there and confirmed it smells like oil?

If the boot has dropped back at the other end of the swingarm, you can get water running in and that might look like your photo.



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post #8 of 17 (permalink) Old Aug 14th, 2007, 5:21 pm
 
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Just like what Vox mentioned. Pinion seal leak, which isn't too bad of a repair.
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post #9 of 17 (permalink) Old Aug 14th, 2007, 9:09 pm Thread Starter
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Quote:
Originally Posted by voxmagna
Have you actually taken the clips off and looked inside to see how much is in there and confirmed it smells like oil?
Not yet.

Quote:
Originally Posted by voxmagna
If the boot has dropped back at the other end of the swingarm, you can get water running in and that might look like your photo.
The boot seems to be in place all around and doesn't have any rips. I need to change rear drive oil very soon anyway and then I'll take a look inside of that thing.
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post #10 of 17 (permalink) Old Aug 15th, 2007, 11:58 am
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Boot Seepage

I had a brand spankin' new 2000 KLT and after several months the boot was seeping a bit, seepage not drippage. Please don't confuse it with shrinkage, entirely different. Anyhow, I pointed it out to my dealer and they said to keep an eye on it and it should go away. I thought yeah right. I cleaned it weekly and sure enough after about 9 month's to a year it was gone. I never had the problem for the remaining 3 years of great service.

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