BMW K bikes (Bricks)

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1Back to top Go down   K1 Rear Drive Empty K1 Rear Drive on Mon Jun 15, 2015 7:12 pm

medobson1

medobson1
New member
New member
I have two issues that may or may not be related. Looking for advice from those who know about the rear drive unit. Bike has 40K on it.
1. My rear rotor seems warped. Been riding it like this for 2 K miles. No discoloration or sticking of the caliper is at all evident.
2. I noted some sign of gear oil last night on the rear wheel rim and for the first time on the rear disc.
Any ideas?

    

2Back to top Go down   K1 Rear Drive Empty Re: K1 Rear Drive on Mon Jun 15, 2015 7:50 pm

robmack

robmack
Life time member
Life time member
Oil might be blowing out the vent at the top. Check to see if that is the case. May be overfilled, if you've redone the fluids in the last little while.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

3Back to top Go down   K1 Rear Drive Empty Re: K1 Rear Drive on Mon Jun 15, 2015 9:09 pm

RicK G

RicK G
VIP
VIP
I would say the two issues probably are not related.
A disc can and will warp for a myriad reasons that you will never find, especially the stainless types. I would replace it with an EBC floating disc which will be less likely to warp.
The drive may be a little over full as that can happen easily when filling if the wheel turns at the time it takes a lot of oil up the top of the case and when cold it takes a while to drain back and so it gets a bit overfilled.
The drives will at times let some oil escape and you may only be noticing this because you have inspected the disc a few times due to the warp. If you pressure wash the bike some water will get into the drive via the breather and when the drive heats up with use the water evaporates off and can take some oil back out the breather as the vapor escapes.
However all that does not mean there may be something wrong so I would change the oil and take a watch and see attitude for now.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

4Back to top Go down   K1 Rear Drive Empty Re: K1 Rear Drive on Tue Jun 16, 2015 11:22 am

medobson1

medobson1
New member
New member
This bike was new to me last year. I bought it as a project bike and am a seasons brick bike owner and mechanic. I reassembled the transmission, clutch replacement this last winter. I was careful in filling the final drive unit with 75-140 synthetic GL5 spec gear oil and it did not exceed the lower thread in the drive when full. I know what a SS or cast iron rotor looks like if it is overheated and becomes warped. This one looks like it has seen light duty. If the bearing checks out good and the seal is leaking. Can I just replace the O-ring seal?

I will check it again but I am concerned about it being related if the rear was serviced, as I suspect.

Has anyone ever needed to replace the vent?

    

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