BMW K bikes (Bricks)

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dallasf

dallasf
Silver member
Silver member
Hey,

I have been down a long and time consuming road with my first k100RS. It was a non-starter and I have done a heap of work to get it up and running again to bring it back.

Long story short, my previous transmission was a k75 which is a different clutch pushrod to the k100. An amazing member gave me a replacement transmission from a K1100. I sourced the new pushrod for this transmission.

Pretty excited to get things back together, however concerned about the pushrod installation.

If you take a look at the image below, it stipulates the way the rod should be installed.

Transmission - Clutch push rod order confirmation (2nd opinion) Clutchdiag

I have removed 8 through to 11 to insert the rod.

This is where I am confused. After removing 11 - Thrust Piston, I can see the bearing which has a circlip around it which I am assuming is 12? It looks like its a part of the transmission not 12. 11 and 12 appear to sit inside each other.

The reason I ask is 13 goes after this and I am very confused. See the picture below of the actual transmission.



So I guess do I just insert the pushrod in as per the above image and I am good to go?



Last edited by dallasf on Mon Jun 07, 2021 2:45 am; edited 1 time in total


__________________________________________________
1989 k100 RS SE - 168,000kms
    

Laitch

Laitch
Life time member
Life time member
@dallasf wrote:So I guess do I just insert the pushrod in as per the above image and I am good to go?
Hey, you're definitely not good to go. 

You've got to find the clutch bearing which seems to have rolled away from you during your frolics unless that's it in the shadows above the circlip. In your photo, you seem to be staring at bearing #10 and its circlip #11 in BMW's transmission drive shaft diagram below. That might be it in the bowels of that chasm. Get it out if it is. Regardless, when you find the bearing that belongs inside the piston cup, oil it with gear oil then put it on the push rod with its open side facing inward to the transmission so it can more easily pick up lubrication from the transmission. If you can't find it, order the one-piece piston assembly and use it instead following the suggestion in the parts fiche.
Transmission - Clutch push rod order confirmation (2nd opinion) Scree153

I wouldn't have considered installing a K75 pushrod—if it looked like the one in your deleted diagram—into a transmission coupled to a K100 engine in the first place. These clutch pushrods aren't specific to the transmissions; they're specific to the clutch packs of the engines. K75s' differ from all the others. All the others—K1002V, K1004V and K1100—share the same clutch pushrod and clutch pack designs. Perhaps I'm just not as adventurous as you. Smile  I wonder if its use resulted in performance issues.


__________________________________________________
1995 K75 81,000 miles
Transmission - Clutch push rod order confirmation (2nd opinion) Usa-lo10
    

dallasf

dallasf
Silver member
Silver member
@Laitch wrote:
@dallasf wrote:So I guess do I just insert the pushrod in as per the above image and I am good to go?
Hey, you're definitely not good to go. 

Also, using a diagram depicting a K100 assembly rather than a K75 assembly when working on a K100 willl likely be less confusing for everybody.

You've got to find the clutch bearing which undoubtedly has rolled away from you during your frolics. In your photo, you seem to be staring at bearing #10 and its circlip #11 in BMW's transmission drive shaft diagram below. When you find the bearing that belongs inside the piston cup, oil it with gear oil then put it on the push rod with its open side facing inward so it can more easily pick up lubrication from the transmission. If you can't find it, order the one-piece piston assembly and use it instead following the suggestion in the parts fiche.
Transmission - Clutch push rod order confirmation (2nd opinion) Scree153

I wouldn't have considered installing a K75 pushrod—if it looked like the one in your diagram—into a transmission coupled to a K100 engine in the first place. These clutch pushrods aren't specific to the transmissions; they're specific to the clutch packs of the engines. K75's differ from all the others. All the others—K1002V, K1004V and K1100—share the same clutch pushrod and clutch pack designs. Perhaps I'm just not as adventurous as you. Smile  I wonder if its use resulted in performance issues.


Hi,

Thanks for getting back to me.

Probably didn't explain myself very well.

I have updated the image to the k100 assembly in my original post, however the same scenario still applies. Numbers are the same too.

My k100RS had a major transmission problem, so it needed to be replaced. Based on the pushrod that came out, it was a k75 transmission in a k100, no idea how or why, but the bike received was in terrible condition.  I replaced the transmission with a k100 and a k100 pushrod. As you can see here, there are two different types of pushrod for 75 and 100, the 75 can be pulled from the front or the back. -R&c[0]=AT1fH62VGjzxS-Iogg271-uLEj8ACeG7tfQx6_GHHoqWLcoed5GTWg3LQ39K3IFl8cpwCshHC3PIqRkpO_vf28LpM6dIPGKVXGOTvAv8rDoK-k-5uTtOawBTB__zo8Mn9hC1sEeej8CDAOT3XHxbWHwnpSTZBE9Hbt4]see here

Based on your above image 10, 11 and 12 are all there and you can see these in the image of my transmission, I have not taken any of that out.

It has become much clearer though it is just a matter of sliding the k100 clutchrod rod in.


__________________________________________________
1989 k100 RS SE - 168,000kms
    

Laitch

Laitch
Life time member
Life time member
@dallasf wrote:As you can see here, there are two different types of pushrod for 75 and 100, the 75 can be pulled from the front or the back.

Based on your above image 10, 11 and 12 are all there and you can see these in the image of my transmission, I have not taken any of that out. 
I don't see what you're seeing there. As far as I know, and from the link you supplied—disregarding the line drawing, there's only one type of K75 clutch pushrod and it is installed and removed from the front of the transmission. This is it.
Transmission - Clutch push rod order confirmation (2nd opinion) 23131410  
If there is another type, i hope somebody who has used it in a K75 chimes in.

If this were my project, instead of gazing at it, I would be taking out the clutch bearing to verify that it is neither deformed nor seized and that its component parts are oriented correctly before I installed the spring and boot. If everything were OK, it would be good to go.


__________________________________________________
1995 K75 81,000 miles
Transmission - Clutch push rod order confirmation (2nd opinion) Usa-lo10
    

dallasf

dallasf
Silver member
Silver member
@Laitch wrote:
@dallasf wrote:As you can see here, there are two different types of pushrod for 75 and 100, the 75 can be pulled from the front or the back.

Based on your above image 10, 11 and 12 are all there and you can see these in the image of my transmission, I have not taken any of that out. 
I don't see what you're seeing there. As far as I know, and from the link you supplied—disregarding the line drawing, there's only one type of K75 clutch pushrod and it is installed and removed from the front of the transmission. This is it.
Transmission - Clutch push rod order confirmation (2nd opinion) 23131410  
If there is another type, i hope somebody who has used it in a K75 chimes in.

If this were my project, instead of gazing at it, I would be taking out the clutch bearing to verify that it is neither deformed nor seized and that its component parts are oriented correctly before I installed the spring and boot. If everything were OK, it would be good to go.
Hey K100 has the thrust bearing on the rod, K75 doesn't.

I will take it out and have a look.

Thanks


__________________________________________________
1989 k100 RS SE - 168,000kms
    

Laitch

Laitch
Life time member
Life time member
@dallasf wrote:Hey K100 has the thrust bearing on the rod, K75 doesn't.
scratch


__________________________________________________
1995 K75 81,000 miles
Transmission - Clutch push rod order confirmation (2nd opinion) Usa-lo10
    

RicK G

RicK G
admin
admin
@Laitch wrote:
@dallasf wrote:Hey K100 has the thrust bearing on the rod, K75 doesn't.
scratch
No it doesn't on both the K100 and K75 the thrust bearing is not part of the pushrod. The K75 has a small mushroom head at the diaphragm spring end and it is not compatible with the K100 clutch. The K75 pushrod must be put into the centre of the main shaft before mounting the transmission where the K100 pushrod can be inserted through the rear of the main shaft followed by the thrust bearing and rubber boot and spring.


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

dallasf

dallasf
Silver member
Silver member
@RicK G wrote:
@Laitch wrote:
@dallasf wrote:Hey K100 has the thrust bearing on the rod, K75 doesn't.
scratch
No it doesn't on both the K100 and K75 the thrust bearing is not part of the pushrod. The K75 has a small mushroom head at the diaphragm spring end and it is not compatible with the K100 clutch. The K75 pushrod must be put into the centre of the main shaft before mounting the transmission where the K100 pushrod can be inserted through the rear of the main shaft followed by the thrust bearing and rubber boot and spring.
Correct!

This is all sorted now. Thanks to everyone for your assistance.


__________________________________________________
1989 k100 RS SE - 168,000kms
    

Laitch

Laitch
Life time member
Life time member
:BW:


__________________________________________________
1995 K75 81,000 miles
Transmission - Clutch push rod order confirmation (2nd opinion) Usa-lo10
    

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