Input shaft seal? 2004 R1150R

[bpotter]

Hi all,

The clutch was slipping on my Rockster with @17k on the odo. I have it apart now and found the disk oil fouled. Initially, I suspected the clutch slave as I see it is a common failure and the well it sits in was certainly filled with fluid. On closer inspection, however, I noted that the fluid looked and smelled like gear oil and was much darker than what is in the clutch hydraulics. The rear seal on the input shaft doesn't look great either so I suspect that is the real problem (although I'll replace the slave as well).

Can anyone confirm the rear seal on the input shaft can be replaced externally or offer any tips for completing that job? I believe it is #2 in the attached parts diagram.

 

[gsaddict]

The 6 speed 1150 input shaft front seal can be replaced without transmission disassembly.
Carefully remove and replace with updated type (brown viton with felt seal)
23 12 7 705 086 SHAFT SEAL - 20X32X8

Depth is critical, see below for driver dimensions

 

[gsaddict]

The rear seal is a bit more difficult to remove. No disassembly required.
Be careful not to damage the sealing surface.
Seal # 23 12 7 705 085 SHAFT SEAL - 17X28X7
Depth is critical as well.

 

[gsaddict]

Drill the bottom of the slave housing as below.
This will allow any oil or brake fluid to escape if required.
Drain slot is also effective but the hole is preferred.
Omit the gasket in that case.

 

[RPGR90s]

I did the same job on a client's bike over the winter. The seals require a special puller like this.
https://probearingtools.com/product...UMul4uOyOM7LMNA26dRMlhF0tCGQXpWIaArlrEALw_wcB

 

[bpotter]

Many thanks for the detailed reply, GSaddict!

Just the type of info I was hoping for. A couple follow up questions, if I may:

It is my rear seal that is leaking - I'm inclined to leave well enough alone in front unless you think that unwise.

Any tips for pulling the rear seal? Sink a small screw into the seal or use a dental pick?

I will certainly be drilling a weep hole in the slave well. If only it was there from the factory, so much expense could be avoided.

 

[gsaddict]

Do the front seal as PM while the transmission is out.
I have never used anything but a heavy duty pick to pull.
On the rear seal, tap in inwards with a pin punch on one side a little bit to break the bond.
It will then pull out much easier.

 

[docimastic]

The rear seal is a bit more difficult to remove. No disassembly required.
Be careful not to damage the sealing surface.
Seal # 23 12 7 705 085 SHAFT SEAL - 17X28X7
Depth is critical as well.

gsaddict...

You certainly are the GOD of R11XX's! Pretty darn cool! I am a new member here, but have been luring an various sites, and it very soon became aparent that YOU are the one most people defer to.

I am curious about why your driver tools (for front and rear input shafts (THANK YOU for posting those!) have different length "handles". I have not done this job yet, (but I expect to as I will be pulling a R1100RT tranny soon, methinks) so maybe if was doing it the answer would become self-evident. Please let me know ......

As a second (related) question, and follow-up.... as you list both the BMW part number AND the seal dimensions, am I seeing a subtle inference that your opinion is favorable about using aftermarket seals? And whatever your opinion is on use of aftermarket seals, would that be the same for all seals, including the two rear crankshaft seals?

PS: Love that you comment about things like "install depth is critical" and "be careful not to damage the sealing surface". Kudos!

Thanks in advance,
David

 

[gsaddict]

This thread pertains to the 1150 6 speed transmission

The 1100 transmissions are different and use different seals.

I have only used OE seals, not aftermarket. The dimensions happened to accompany the copied part number.

 

[docimastic]

This thread pertains to the 1150 6 speed transmission

The 1100 transmissions are different and use different seals.

I have only used OE seals, not aftermarket. The dimensions happened to accompany the copied part number.

Thanks so much for your quick reply. I did not realize, obviously, that the 1100 and 1150s have different transmissions and use different seals. But I am picking up a 2004 R11150RT next week! Thanks again, and wishing you a great day! David