Originally Posted by pauleknight
I just got back from Daytona BMW and they want $500+ to replace the final drive seal and the gear box seal.
I went in to have them put on a new front ME880 and they said I need new seals.
I looked in the service manual and searched the forums and could not locate a guide for replaceing the final drive seal.
Any pointers or link would be appreciated
They say you need both tranny output and FD input seals? What are the odds of both or 'em leaking? Maybe they are both leaking or maybe Daytona just is taking the shotgun approach. What the heck, I wonder what else they can replace while they're in there.
Seriously, I'd check the pivot bearings while the FD is off the bike.
My suggestion is to determine where your leak is. Is it the FD input seal or the tranny output seal. Okay, maybe it really is both. There are some methods to try to determine which. Use different color lubes in the FD and tranny. Then see what color ends up in the swingarm boot. Or if a significant volume of lube is showing up in the swingarm, check level in the FD and tranny; the one losing fluid level is the leaker.
For the tranny input seal, search for the clutch slave weep hole instructions, that'll get you close to the tranny output seal.
For FD input seal replacement, I haven't seen anyone post the method. It is in the BMW service manual and it isn't all that easy. You'll need a special tool (I got one from a local autoparts store and modified it with welding and grinding to fit). And because of the torque values, you'll need a way to secure the final drive to remove and replace the highly torqued retaining ring that must be removed to get the seal.
I work on final drives as a hobby of sorts but now charge a 100 bucks for my time and shop supplies in addition to parts costs. Most of the drives I work on end up costing folks $200-300 after shipping, parts and all. I'd be no help to you with the tranny seal but you could do that when the FD is off if it is needed. If you sent me the FD for changing the input seal, I'd check the crownwheel bearing for preload too. Send me a private msg if you'd like my help with the FD. If you want to tackle it yourself, it isn't really that hard, you just need to source the socket, figure a way to really stabilize the final drive (it is another special tool in the BMW service manual, but I use a heavy duty workbench and a combination of vice and big C-clamps. If your table isn't quite heavy or bolted down, you'll flip the table over trying to remove the retaining ring.)
In summary, things you'll need: special socket for the retaining ring, breaker bar with a "cheater" to remove the retaining ring, a way to secure the FD while doing that. BMW specified Hylomar sealant for sealing the threads of the retaining ring when installing the new seal. Torque wrench to reinstall the retaining ring. I think that's it.... if you have other questions, I'll try to help.