So a little bit of final drive fluid leaked out when I removed the rear tire. Mainly through the bold holes... is this normal?
Might be some good info on fluid leaking thru rear tire bolt holes here. Look for recent posts by John Zeiler.sheldan2 said:Some times fluid will escape through the breather at the top of the final drive. Clean it up well with brake cleaner, check your fluid level in the final drive, ride it for a couple of days and re check everything. If fluid is there again, might want to change the seal.
Dick, I had a sinking feeling reading my old post in that thread. One of my biggest misstatements regarding final drive when I blamed oil coming out the wheel bolt holes on there being too much oil. I was really WRONG!Dick said:
What year bike and how many miles?skotlyc said:So a little bit of final drive fluid leaked out when I removed the rear tire. Mainly through the bold holes... is this normal?
Scott,skotlyc said:My bike is a '99 with 68000mi on it. It was a very small amount of oil out of the bolt holes only when the bolts were removed. No other leaking up until I removed the bolts completely. Should I paste it back together and ride it till I notice play in the rear end? No other explanation... (anything PLEASE)? You can lie to me if you like...
I probably should clarify, whenever someone has symptoms of the "classic" crownwheel bearing failure, my advise IS to stop riding at once or risk further damage to the FD. AND the crownwheel bearing failure won't go very far once the vibration, grinding, etc. are felt by the rider, and it won't go far before the hub seal tears and FD lube is on the rear brake and tire.wa1200lt said:One last addendum to CharlieVT's comment about riding until it fails. Don't ride any further from home than you are willing to push it. About 5 feet for me.
Yes, the steel crown gear has the aluminun seat for the tapered roller bearing pressed into it. Engineers on this site have suggested that BMW did this so heat expansion/contraction of the crown gear assembly would match the heat expansion/contraction of the final drive housing.skotlyc said:.....am I to understand that the Steel Crown gear is eparating from the aluminum hub assembly which is causing the oil leak?......
.....Has anyone ever tried to braze them back together? If one were to drill and place dowel pins between the steel gear and the aluminum hub for radial support, and then braze the two together for axial support would that work?.......
Seems high priced to me. I'd want to pay no more than $200 for that drive.skotlyc said:I did find a used drive on ebay. It makes me nervous though with 115k miles on it. The gentlemen claims he has always kept synthetic in it, and has never had any leaks or signs of failure. He is asking $400 for it, is that a good price? I personally thought it was about $100 high for having that many miles on it. Should I rebuild it with new bearings before I install it? Sounds like its probably a better option than repairing the one I have.