The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: jamestnewsonr65 on June 23, 2014, 02:54:50 PM

Title: Transmission gear selector leak
Post by: jamestnewsonr65 on June 23, 2014, 02:54:50 PM

Hi there,
Over the weekend I drained the oil from the transmission and replaced it with fresh, but after removing the shifter arm attached to the transmission it seems to have developed a leak. The long bolt which holds the shifting arm on is tight and I cant seem to figure out why it is leaking.

Is there a special way of reassembling this part?

No.3 in this image is what i'm reffering to. http://www.realoem.com/bmw/showparts.do?model=0359&mospid=51898&btnr=23_0269&hg=23&fg=41

Thanks in advance of any answers.

Title: Re: Transmission gear selector leak
Post by: Barry on June 23, 2014, 03:18:25 PM

Not sure why you needed to remove the shifting arm but there is a seal which may be leaking having been disturbed. It's not shown on that particular fiche but it's item 9 on this one.

http://www.realoem.com/bmw/showparts.do?model=0359&mospid=51898&btnr=23_0256&hg=23&fg=11

Title: Re: Transmission gear selector leak
Post by: jamestnewsonr65 on June 23, 2014, 04:14:18 PM

It was removed as it was caked in dirt and grit. Do you know if it is possible to replace this part?

Title: Re: Transmission gear selector leak
Post by: Bob_Roller on June 24, 2014, 09:50:10 AM

It's an easily replaced part .

Don't scratch the bore that the seal sits in and make sure the seal is in straight, or it could bind up the shifter shaft and cause gear shift problems .

Title: Re: Transmission gear selector leak
Post by: mrbuck on June 24, 2014, 10:31:59 AM

Bob is correct.  The first time I replaced mine I goofed up by pushing it in too deep and ended up having to replace it.  BMW has a tool or gauge to make sure the seal goes in straight and to the right depth.

You can gauge this yourself by paying close attention to the depth of the one you are about to replace.  When I worked at the BMW dealership and heard folks asking for the seal, I told them if they were from out of town to buy 2 in case the first did not correct the problem.

For sure, though, make sure you do not scratch the sealing surface or it will leak and that's that.  Good luck.  It's no big deal if done right.

Title: Re: Transmission gear selector leak
Post by: montmil on June 25, 2014, 08:59:20 AM

You have a couple choices for the shift shaft seal replacement.

Clean off the gearbox drain plug, capture the gear oil in a clean container and reuse it after the seal job.

Or,just  lean the bike over and rest it on a steady support using pads or toweling. Little or no gear oil will run out as you carefully remove the old seal. As the bike is leaned over, the install job is much easier on the knees and nerves.

Title: Re: Transmission gear selector leak
Post by: jamestnewsonr65 on June 26, 2014, 03:32:42 PM

Turns out the seal had a broken spring in the middle so it was not sealing correctly. New one on order from motobins.

Cheers
James