leaking fork seals - BMW Luxury Touring Community
 
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post #1 of 5 Old May 5th, 2014, 3:12 pm Thread Starter
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leaking fork seals

I'm replacing my fork seals. I have the old seal out. I'm looking at it to see if I can see why it is leaking. It is a 2001 year model K1200LT, but not many miles. I can't see any wear or cut marks. Why is it leaking?

Could there be an alignment problem with the upper triple tree, mid mount and lower axle clamp?

Since I have it apart, how do you align all that up?

1999 K1200LT Rat Bike Sold
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2002 R1150GS sold
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post #2 of 5 Old May 5th, 2014, 4:02 pm
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Re: leaking fork seals

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Originally Posted by jwacree View Post
I'm replacing my fork seals. I have the old seal out. I'm looking at it to see if I can see why it is leaking. It is a 2001 year model K1200LT, but not many miles. I can't see any wear or cut marks. Why is it leaking?

Could there be an alignment problem with the upper triple tree, mid mount and lower axle clamp?

Since I have it apart, how do you align all that up?
This might help. Hope so.
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post #3 of 5 Old May 5th, 2014, 4:38 pm
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Re: leaking fork seals

There's a vent hole near the top of the tube. Mine had gotten enough water in there that it raised the oil level (I think) enough to help it leak oil. Also check the copper/teflon sliders at the top of the tubes for wear and tear. If you see copper, time to replace.


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post #4 of 5 Old May 24th, 2014, 8:51 pm
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Re: leaking fork seals

ere is what happens with forks (all forks). The factory never fills the fork oil to recommended levels and owners never check these levels. As a result many forks get insufficient oil to the slider bushings, or dirt gets in and around the seal and adds wear to the bushings. In addition to the aforementioned the pressure exerted on the bushings is such that they wear over time. As the bushings wear more unwanted motion occurs in the fork and eventually it causes a seal leak.
Lots of people will replace the seals thinking it will stop the leak, which it will for a short time, BUT they still have a major problem (bad bushings).
Long and the short of it is if you are replacing fork seals you also need to replace the bushings and oil. We are not talking about a lot of work or cash to do the job right.
Hope this helps.... and for the record I have rebuilt hundreds if not thousands of forks over the decades. Worth every penny & hour spent rebuilding the suspension.
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post #5 of 5 Old May 26th, 2014, 12:58 pm
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Re: leaking fork seals

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Originally Posted by Teach View Post
Lots of people will replace the seals thinking it will stop the leak, which it will for a short time, BUT they still have a major problem (bad bushings).
Long and the short of it is if you are replacing fork seals you also need to replace the bushings and oil. We are not talking about a lot of work or cash to do the job right.
Hope this helps.... and for the record I have rebuilt hundreds if not thousands of forks over the decades. Worth every penny & hour spent rebuilding the suspension.
Thanks Teach for the 'heads up' on this. One of the seals on mine has a bit of a leak, so now plan on replacing the seals & bushings next Fall.

A. Jensen (Mean Dog)
09' R1200RT
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