Author Topic: K75 clutch pushrod seal install  (Read 11030 times)

Offline Motorhobo

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K75 clutch pushrod seal install
« on: October 26, 2013, 10:20:24 AM »
Smarter and more experienced people than me probably have had no problem getting that tiny little seal on behind the puck at the rear end of the transmission.



Back in '09 before I set my 95 K75 out to pasture for a couple years, I had an oiled clutch due to a rear main seal leak. I fixed it but could not get the tiny seal in straight and it buckled a bit. This caused gear oil to creep up the shaft and get on the clutch disk. So when I did the spline lube last month I cleaned up the bell housing and clutch parts and ordered a new input shaft seal.

I should have ordered two right away because I dinged the new one up the first install attempt. Due to its tiny diameter it would just not seat straight and once it goes in crooked once, it's done for. So I ordered a yet another one at $18 a pop and another one as spare in case I screwed it up again. This time I put some thought into it and it went in straight with one good tap.

I don't know if it's easier to do this with the tranny installed. Mine was out. Either way, I think it's risky to try to tap it in without using the input shaft for alignment. Here's what I did with the tranny out as shown in the pic below:





I also wrapped a bit of blue tape around the shaft before sliding it through the bore in to prevent it from wiggling around.


If anybody knows of a better, easier way short of creating a custom tool or just being better at driving in seals than I am, feel free to share. I looked around pretty good before attempting it the 2nd time and got the tip for using the shaft for alignment from my buddy Mike. Maybe my method was overkill but those little buggers are expensive, not to mention it's an 1.5 freeway ride to get to the nearest dealer and just because it's a tiny seal doesn't mean they don't charge you $11 to ship it.

Van
1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 193k miles
1994 K75 since 2013, 76,000 mi (11k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B'

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline Inge K.

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Re: K75 input shaft seal install
« Reply #1 on: October 27, 2013, 09:50:26 AM »
If anybody knows of a better, easier way short of creating a custom tool or just being better at driving in seals than I am, feel free to share.

Maybe these pictures from the Swedish BMW Club forum would give you some ideas, you need a lathe, tho.


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Offline Motorhobo

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Re: K75 input shaft seal install
« Reply #2 on: October 27, 2013, 05:56:50 PM »
@Inge
Wow, that's impressive. Wish I could do that...but I can't. Is that what you use or do you just whack it in and somehow always get it to go in straight?

Van
1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 193k miles
1994 K75 since 2013, 76,000 mi (11k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B'

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline wmax351

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Re: K75 input shaft seal install
« Reply #3 on: October 29, 2013, 08:46:21 PM »
@Inge
Wow, that's impressive. Wish I could do that...but I can't. Is that what you use or do you just whack it in and somehow always get it to go in straight?

Van


When I resealed my trans (had it out anyways) I popped it in with a socket. There is a locating lip at the bottom, that will keep it straight. I also had the shaft out, so I could more easily pound it in.
  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline Elipten

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Re: K75 clutch pushrod seal install
« Reply #4 on: January 14, 2014, 11:37:12 AM »
I'm going to replace this seal as part of my rebuild.  How do I remove the seal?
  • San Antonio, TX
  • 1990 K75RT

Offline Motorhobo

  • +20 years of K75
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Re: K75 clutch pushrod seal install
« Reply #5 on: January 15, 2014, 05:59:49 PM »
I pulled out with a curved pick, taking care not to let any bits fall into the roller bearings. It came out pretty easily but got destroyed on the way out...it's not reusable anyway so it doesn't matter if you tear it up. But someone else ,mentioned a small drywall anchor or something like that...seems like that would be better...anybody remember what that was all about?

With the pick I was also careful not to score the bore.

Van
1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 193k miles
1994 K75 since 2013, 76,000 mi (11k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B'

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

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