1 Rear main seal replaced twice last Year, Leaking a 3rd time. What am I doing wrong? Sun Oct 10, 2021 12:58 am
sid_knee
active member
Hi, I bought a 94 K1100 that had been sitting around for a while. All the rubber seals died as soon as I started riding it. Fine. I'm used to them going and replace them.
July 2020 The RMS went, taking a friction plate out with it. Cool. Replaced them both as Mr Clymer says to. The stop disc crumbled as I took the clutch housing off, but given that I was in rented workshop space I elected not to replace the stop disc and just press on regardless, the wait time and cost for a replacement 1mm magic washer being 9 weeks and $100.
3 weeks later there is a decent stream of oil out the weep hole. Mistake :/ I bite the bullet and order a stop disc from Munich. Given how annoying having to rip a K bike in half is I replace the main seal here again in case it was a dud seal (It was one of the older type seals with the little spring). This time I also made sure to make the RMS sit either deeper or prouder (can't remember which) in case there was scoring on the output shaft even though I couldn't see or feel any. Everything back together and it's OK for 6 months and a 1,200Km tour + daily commuting, but then it starts slipping on acceleration in 4th/5th.
I manage to baby it for another 1000Kms to a family farm where I have access to a decent workshop and have ripped it in half again only to find engine oil on the engine side of the clutch. I was thinking it might have been a clutch spring or the friction plates at fault (they are a little worn but in spec) so I found a 2nd hand clutch on eBay and intended to install it, but now I know it's another leak I'm not sure what I should do. I replaced all the bolts you should replace every time. And the O ring is new every time. Torque specs all followed each time. The leak is always from behind the clutch housing, never through the Oring.
I don't have precision measuring tools, so I have to wait until tomorrow to get a machinist in town to measure for me. I have compared the two clutch housings and pressure plates visually and by touch. The replacement set looks older in construction but less worn on the pressure plates. Both of the surfaces that would rub on the lip of the RMS feel similar and the rusty calipers I had to hand measured the same on both.
One side issue is that I have no idea what orientation the 2nd hand clutch assy should be in as whoever salvaged them didn't mark them so if anyone has any advice on that I'll take it.
I bought the expensive "touring" friction plate because I just can't face ripping apart this bike again and the leak is quite minor. I'm going to order another main seal, but
would replacing the clutch assembly potentially solve these leaks?
Should I use the stop disc on the replacement clutch?(I'll measure this as well to be sure)
Am I missing something obvious?
This is the RMS I have on now that is leaking, the product description now I look at it doesn't mention K1100LTs (will call tomorrow about that) could that be a thing? I can't imagine there's that much difference with the 100 Vs 1100 in this area.
Thanks for reading the epic!
Pics:
https://ibb.co/277Gg7F
https://ibb.co/xFH8xrC
https://ibb.co/ySH9fXX
https://ibb.co/LzYtx1v
https://ibb.co/vmBjbqn
July 2020 The RMS went, taking a friction plate out with it. Cool. Replaced them both as Mr Clymer says to. The stop disc crumbled as I took the clutch housing off, but given that I was in rented workshop space I elected not to replace the stop disc and just press on regardless, the wait time and cost for a replacement 1mm magic washer being 9 weeks and $100.
3 weeks later there is a decent stream of oil out the weep hole. Mistake :/ I bite the bullet and order a stop disc from Munich. Given how annoying having to rip a K bike in half is I replace the main seal here again in case it was a dud seal (It was one of the older type seals with the little spring). This time I also made sure to make the RMS sit either deeper or prouder (can't remember which) in case there was scoring on the output shaft even though I couldn't see or feel any. Everything back together and it's OK for 6 months and a 1,200Km tour + daily commuting, but then it starts slipping on acceleration in 4th/5th.
I manage to baby it for another 1000Kms to a family farm where I have access to a decent workshop and have ripped it in half again only to find engine oil on the engine side of the clutch. I was thinking it might have been a clutch spring or the friction plates at fault (they are a little worn but in spec) so I found a 2nd hand clutch on eBay and intended to install it, but now I know it's another leak I'm not sure what I should do. I replaced all the bolts you should replace every time. And the O ring is new every time. Torque specs all followed each time. The leak is always from behind the clutch housing, never through the Oring.
I don't have precision measuring tools, so I have to wait until tomorrow to get a machinist in town to measure for me. I have compared the two clutch housings and pressure plates visually and by touch. The replacement set looks older in construction but less worn on the pressure plates. Both of the surfaces that would rub on the lip of the RMS feel similar and the rusty calipers I had to hand measured the same on both.
One side issue is that I have no idea what orientation the 2nd hand clutch assy should be in as whoever salvaged them didn't mark them so if anyone has any advice on that I'll take it.
I bought the expensive "touring" friction plate because I just can't face ripping apart this bike again and the leak is quite minor. I'm going to order another main seal, but
would replacing the clutch assembly potentially solve these leaks?
Should I use the stop disc on the replacement clutch?(I'll measure this as well to be sure)
Am I missing something obvious?
This is the RMS I have on now that is leaking, the product description now I look at it doesn't mention K1100LTs (will call tomorrow about that) could that be a thing? I can't imagine there's that much difference with the 100 Vs 1100 in this area.
Thanks for reading the epic!
Pics:
https://ibb.co/277Gg7F
https://ibb.co/xFH8xrC
https://ibb.co/ySH9fXX
https://ibb.co/LzYtx1v
https://ibb.co/vmBjbqn
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K1100LT (94)