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Discussion Starter #1
A bit of history about the bike. Its an 05 that I got used earlier this year. At the time it had less than 24K miles on it. It now has 28K miles on it. As far as I know, it is up with it services. While the dealer had it for sale, they discovered a seal was leaking and the oil that got past it had contaminated the clutch disc, so they replaced the seal and put in a new clutch. Sorry, not up on my terminology of what seal etc.

I have had the bike out on short to meduim day trips with no issues. Last weekend was my first extended ride on it, all across Washington state at speed for hours and hours. Did 600 mile days on average. Again no issues. This past weekend, Fri/Sat, was out again ranging across eastern Oregon, again for hours and hours at speed, Fri was 10+ hours, Sat a bit over 5. Last rest stop before home, looked bike over and this is basically what I saw. Got home and looked it over again and figured at least the riding I wanted to get done this season I was able to do.

I have not moved the boot yet or done anything to it other than look and take photos. What should I be looking for when I move the boot? Anything else or anywhere else to check? I have tried to give the back tire a good shake and can't feel any movement.


 

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When you pull the boot, there will be some gear oil that will drain out. Can't tell you how much. When mine did this there was about a teaspoon of oil.

The problem will be either the tranny output shaft seal or the final drive seal. Mine was the tranny ouput shaft seal, replaced under warrantee last year. Bike had about 30K on it.
 

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Discussion Starter #3
If its one of those two seals is it something a backyard hack mechanic can do or should it go to the shop?
 

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Wrencher Extraordinaire
2005 K1200LT
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It is pretyy easy to do once you get to it. Take a look at the Weep Hole video in the stickey at the top of the page (part A). It will show you what you have to do to get to it. If is is a minor leak, which most of them are, just leave it until you need to get in there. If it is much more than a teaspoon full after 10K I would go after it.
 

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jzeiler said:
It is pretyy easy to do once you get to it. Take a look at the Weep Hole video in the stickey at the top of the page (part A). It will show you what you have to do to get to it. If is is a minor leak, which most of them are, just leave it until you need to get in there. If it is much more than a teaspoon full after 10K I would go after it.
Ditto on what the master mechanic said.. I will add that for piece of mind I wanted to know where (which end) the leak originated. Much easier to ride a ruff ride if the gear box seals are leaking, rather the final drive!

My solution to this was to replace the final drive oil with royal purple. Clean the boot area, ride for a bit and check the boot for oil. I could make out that the oil inside the boot was regular (not colored) so my mind was set at ease with a gear box seal leak.

That said, I honestly have not seen a leak as prominent as the one in your pictures. It would seem to me that it is excessive and not a simple leak...
 

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Discussion Starter #6
Have yet to get off my backside and crawl under the bike............but if its a transmission seal, is this something that most likely BMW did when they did the clutch etc and may be covered under warranty for work they did? I ony ask because after their work with the clutch etc, the load shed relay bolt was not put back in properly and after buying the bike I had to take it back to them to have the bolt put in. That was after the tech asked what bolt I was talking about and had me show him where it was supposed to be.
 

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Discussion Starter #7
OK, got under the bike, cleaned it all up and loosened the boot and pushed it towards the rear. Yup, some nice beautiful clean oil came dripping out, maybe a spoon full actually plopped out. Sticking my finger in the swing arm, seems well lubed towards the front of the bike. :( So does this sound like the transmission seal, the one the shop replaced along with the clutch?? Their problem??

If the rain holds off for a bit, will take it for a spin to see if I can get more oil to migrate to the boot??
 

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Sit said:
Have yet to get off my backside and crawl under the bike............but if its a transmission seal, is this something that most likely BMW did when they did the clutch etc and may be covered under warranty for work they did? I ony ask because after their work with the clutch etc, the load shed relay bolt was not put back in properly and after buying the bike I had to take it back to them to have the bolt put in. That was after the tech asked what bolt I was talking about and had me show him where it was supposed to be.
I would be surprised if they replaced this seal during a clutch replacement, but it doesn't hurt to ask.
 

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Discussion Starter #9
They did the clutch because some seal leaked and contaminated the clutch. Tech on ride notice clutch slipping...that's why they did the seal and clutch. Are we talking about the same seal that may now be leaking?
 

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Sit said:
They did the clutch because some seal leaked and contaminated the clutch. Tech on ride notice clutch slipping...that's why they did the seal and clutch. Are we talking about the same seal that may now be leaking?
I have not personally had an LT apart, so hopefully John will chime in here, but I have worked on many other standard shift vehicles and I can't imagine the output shaft seal having a means to contaminate the clutch. The clutch is located between the engine and the transmission. This means that it is vulnerable to a leak on the output side (rear crankshaft seal typically) of the engine or the input side of the transmission. So, I suspect they replaced either the engine crankshaft seal OR the transmission input shaft seal. The other possibility unique to the LT is the slave cylinder seal can also leak and contaminate the clutch. However, I don't see how the transmission output shaft seal could cause clutch damage, but will need to let someone who has actually had an LT apart comment on that.
 

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Discussion Starter #11
Way too many seals for me. It's all Greek to me.
 

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2005 K1200LT
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Normally that seal is not touched during a clutch job unless it is leaking. It has no effect on the clutch. Mine started leaking at 18K on my 05 and I had them replace it under warranty. With the right tools it is about a four hour job to replace.
 

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Discussion Starter #13
Guess I will try to get some of the paperwork for the repair to see if it was done for some reason. Ride the bike and see if it is still leaking or if by some miracle it was some freak one time leak, hahahahaha. And then start calling around to see who can do it for what.
 

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Hi, I'm riding a 2009 K1200LT I just returned from a trip to Cape Breton, Nova Scotia, & Gaspe Bay, while on he trip, I noticed a black viscous oil/grease weeping out of the bottom section of the boot & running down the swing arm, some also on the rear rim & tire, cleaned it off but it kept weeping. I removed the tie wrap & hose clamp, & a fair drop of water came out. I checked the oil level of the FD & the front gear box ( removed front foot rest to check this one), both levels were O.K. Note we had been riding through rain on this trip, called a friend, figured water had got in past the boot & washed the grease off the drive shaft splines, had no choice but to keep riding it home, it,s now in for a service, dealer confirmed no seal leaking, but i have asked him to remove the drive shaft & relube the splines. I will be removing this boot to check for water more frequently in future. would anyone have any thoughts on this?
 

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2005 K1200LT
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Water usually enters when the front boot (between the swing arm and tranny) is not seated. Lubing the splines on the LT is not critical as they do not slide like the early bikes but are held captive with a circlip on each end. Make sure that front boot is seated.
 

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reply to SIT:

Check your invoice detail for this BMW part number: 23127705085 (approx $14)
The catalog description is: SHAFT SEAL, DRIVE SHAFT - 17X28X7
This is the transmission Seal where the Drive-Shaft is connected.

As others have mentioned, the dealer does not need to replace this seal for a clutch job, but some will do all the seals while they are in this area and everything is apart.
 

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Hi John, Thanks for the reply, I will check the seating of the boot when the service is complete, thanks for commenting on the spline drive grease, it's reassuring to know, that no damage should have occurred to the bike during my ride home.
 

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2005 K1200LT
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Terry,

You are in the same town as Jim (RealWing) Bagshaw. Have you ever hooked up with Jim? He is quite a wrench.
 

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Hi, That.s amazing that you know of Jim Bagshaw, my friend who I was on this trip with, knows Jim & we called him while in the Gaspe Bay, he gave me the confidence to keep riding the bike, after I'd checked out all his suggestions, I am hoping to find an excuse to hook up with him in person in the near future
 

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A "wrench" That is me - I can take anything apart!!!!
 
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