New K rider, need main seal job info - - Excellence in Motion
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post #1 of 2 (permalink) Old Sep 13th, 2010, 1:49 pm Thread Starter
Join Date: Sep 2010
Location: WIlm, nc, usa
Posts: 1
New K rider, need main seal job info

Hey all,

I picked up a 2003 RS with 21k today, the bike is awesome but toward the end of my 150 mile ride back home I noticed that the clutch is slipping when I go to take off from a stop. It does not slip any other time but I suspect this is due to the rear main seal?

I'm not exactly sure where to look but I snapped a few pics of where I see oily grime (Lots of caked up grime at the final drive boot). The Previous owner did have the bike sitting for an extended period.

After researching this site I expected I would need to do this job, and I might as well do any PM while I have the bike apart. I ordered the service manual but I have not found a thread which lists all the parts to replace while I have the bike apart. Can anyone point me to a thread or let me know what parts to replace while I attempt this job?

After some more reading, this issue can be caused by several failures? When I look to where the engine and transmission connect I do not see any grime, I only see grime at the final drive, and a bit on the back of the transmission

Last edited by hp660r; Sep 13th, 2010 at 2:34 pm.
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post #2 of 2 (permalink) Old Sep 13th, 2010, 2:42 pm
Join Date: Jun 2006
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Posts: 2,680
Search for Max BMW online parts. That'll get you started in your parts search and give you the prices.

That rear drive stain is probably the rear pinion shaft seal in the final drive leaking. Common, but takes a special castellated socket to get it apart to jerk the seal out. I took mine to the dealer once I got it off the bike and had them look it over for wear anf if they thought it needed anything else while off. I think I spent $185 or so for the job. Fwiw, those pivot hex bolts on the shaft cover are tight (Locktight) and you may have to use a torch to heat them up to soften the bond along with a long snipe on a breaker bar.

The clutch slippage may be seepage from the tranny seal that gets pumped towards the clutch itself and not necessarily from the rear crankshaft seal. You'll know once you get it broken down. Many had it leak out the 'rear' tranny seal and flow up the middle of the shaft that holds the control rod onto the clutch. I'd replace all the seals in the tranny as they are probably dried out and shot. Heat from the catalytic hardens them up pretty quick.

I'd also bug your dealer for any updates to the parts on that old a model and get them installed too. They make minor changes that you may never hear about unless you tel them what you are doing. That control rod in mine changed design and I had to get some additions to make it work on my RT. Trust me, you don't want to pull it apart a second time. Mine took me about two weeks awaiting parts and sundry stuff to get it back together. You'll always find something else that could or should be changed once in there.

Good luck, and photograph the hell out of what you need to remove to refer back on later.

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