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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: billday on March 16, 2014, 07:16:32 PM

Title: Pinion or bevel gear seal in final drive
Post by: billday on March 16, 2014, 07:16:32 PM

Hi everybody. I just pulled my final drive and found a pool of gear oil in the nose.

Has anyone here ever replaced this seal? (I presume it's item 4 here: http://www.maxbmwmotorcycles.com/fiche/Diagrams/B0004418.png?v=04302013 (http://www.maxbmwmotorcycles.com/fiche/Diagrams/B0004418.png?v=04302013) )

I replaced my ring gear seal a couple years ago, got lots of good advice on the web -- but I'm not finding anything on this little number. Does anyone have any experience to share?

Bill 1985 K100

Title: Re: Pinion or bevel gear seal in final drive
Post by: pfls on March 17, 2014, 08:36:44 AM

It is difficult. The nut that is at the end of the driveshaft splines must be removed to get the collar that holds the seal out. This nut has a high torque, and also has red locktite on the threads. The fixture to hold the final drive and keep it from turning is expensive. You can make a substitute if you have a welder, but I would suggest having a shop with the factory tools do the job.

Title: Re: Pinion or bevel gear seal in final drive
Post by: billday on March 17, 2014, 07:41:57 PM

Thanks pfls. I saw a thread on another forum where someone said, "Just let it leak." Now I start to understand why....