When replacing the clutch pushrod seal do you...

[BlueK11LT]

fit it so that the flat side is facing outward as in the first photo?


or that the other side with recess and the small circular spring visible is facing outward as in the second photo?
 
As iam replacing the contaminated clutch plate (I suspect due to o ring failure) I decided it would be wise to replace the rear main seal,both gearbox shaft seals and the pushrod seal,but I was surprised that the existing pushrod seal was fitted as per the 2nd photo,
Also have BMW changed the type of pushrod seal fitted to K Bikes?,the one I pulled out had a metal outer shell that was a pig to get out of the end of the shaft after I had pulled all the rubber off it,but the replacement I got from motobins uk is just a plain seal without the metal outer shell

[Inge K.]

On all seals with one spring the spring should face the oil.....this seal isn't available from BMW anymore,
so the one from Motobins is non OEM.

[BlueK11LT]

Thanks - I suspected this was the case,its just a pity some parts suppliers don't update their websites often enough, motobins,motorworks and James Sherlock still all show photos of the original metal encased seal.

[wally.fisher]

You don't,t have to buy from motor works, buy from a local dealer.

Sent from my ONEPLUS A5000 using Tapatalk

[BlueK11LT]

I will bet  that almost everyone on this forum routinely orders almost all of their parts online these days.
My nearest BMW dealer is primarily for  BMW cars,they normally have a few new and used bikes on display but I don't think they carry much in the way of parts,especially for older models
They probably would not have had the seal in stock anyways so its just as quick and more convenient to order stuff online from the people that do have the parts in stock and have it arrive in the mail within one or two days.

[Scott_]

Just an Inge says, the spring faces the oil. The oil would be between the seal and the boot clamped to the outside. So it would be as in picture #2.

[BlueK11LT]

This is confusing me a bit ,firstly the old metal encased seal which I pulled out was fitted so that the small circular spring was facing rearward to the actuating mechanism,so this is the correct way to install the new seal right?
But if there is supposed to be oil in the boot to keep the actuating mechanism lubricated (ive also read this fact in other posts and I assume it means oil getting through from the gearbox)  then how does the oil get there if theres a seal between the gearbox and the boot?
Or are you supposed to oil the actuating mechanism on its own then fit the boot? am I missing something here?

[Scott_]

When you say "rearward toward mechanism," if you are referring to "the back of the bike" then yes you are correct. Forward of the seal "towards the clutch" the space that the push-rod occupies is supposed to be dry.

Somewhere in the transmission casting between the push-rod seal and the outside boot, there is a passage way for the transmission oil to get into that space for lubrication of the little rotating "throw out" bearing.

No, you don't need to lubricate on assembly.

[BlueK11LT]

When you say "rearward toward mechanism," if you are referring to "the back of the bike" then yes you are correct. Forward of the seal "towards the clutch" the space that the push-rod occupies is supposed to be dry.

Somewhere in the transmission casting between the push-rod seal and the outside boot, there is a passage way for the transmission oil to get into that space for lubrication of the little rotating "throw out" bearing.

No, you don't need to lubricate on assembly.

I assume the gearbox oil just seeps through the bearing at the rear of the gearbox shaft and runs back towards the throw out bearing then

[Scott_]

Looking at your 1st pic, I can see some of the roller bearing of the shaft, so your theory of oil migrating thru the bearing looks to be a correct one.

[Lucas1983]

Hi guys found this topic as I have the same issue now.  Spent entire winter replacing all the seals on my bike but did not do it to the gear box. Bike is put together now and I am leaking gear oil from the clutch shaft. Can I replace that shaft seal without taking the gear box apart?

[Laitch]

Bike is put together now and I am leaking gear oil from the clutch shaft. Can I replace that shaft seal without taking the gear box apart?

Is the fluid leaking from the boot, or from where the adjusting bolt enters the boot?

[Lucas1983]

From the boot.  Realized after the fact, there was a small tear in the boot.  However, that happend after I destroyed the shaft seal. That little o ring spring came out.  Also, was not aware it is normal to have oil in that boot.
Now I need to replace that seal. Can I do it without taking the gear box off the bike?

[frankenduck]

Can I do it without taking the gear box off the bike?

Yes. It's a TIGHT fit. I mutilated the first one I tried to install. Then I used a small socket with the same diameter as a drift pound it in evenly. That worked great.

[Lucas1983]

I am still at the removal stage of the old seal.  Does not want to move with simple picks.  Read some horrific forms where heat had to be introduced to remove the old metal seal. Hope it doesn’t come to this.  My idea is to use spline extracting tool or should I start with internal bearing extractor? Not much meat there to grab it with internal bearing extractor.