1 Water pump shaft and seal issues. Incompatibilities??? Mon Nov 14, 2016 8:56 pm
Atsea
active member
Hi Folks
I’m‘ working on a K100 cafe bike, 1985 and the water pump is giving me hell big time. I wanted to rebuilt it and I have found out a few weird things.
By pump has been the one with the cast iron impeller. Originally with the shaft that had a screw going in through it (female) but the bolt got broken inside so I decided to buy another one and the only one I found on ebay is the type with the screw already built in in the end of the shaft.
Here is the rub, I have the shaft with the screw built in at the end, I installed the lip seal no problem. I got the water seal, see picture and got it in with no problem. At this point I have the seal installed so that from the impeller side I can push and action the spring on the seal. I’m happy, no cursing so far. Now I oil a little bit the shaft, and proceed to install it. Going through the lip seal was a piece of cake. As the shaft get into the water seal it seems it does not want to come out by hand so I decide to tap it gently and all of a sudden, pling!, a piece of the seal (the one I point with the yellow pen) comes the other end but the rest of the seal stays in place. WTF. It seems the shaft has a bit bigger that the seal bore and by pushing "breaks" the seal in to piezes, one that stays in place and the other ones comes off.
I removed the shaft and pressed back the little piece that apparently it was not broken. It clicked and went back to normal.
1- At this point I don’t know if I have broken the seal or not. It does not seems to me since I was able to put it back. Let say no
2- If I make the shaft coming through gently tapping here and there, the part of the seal in contact with the shaft will spin with the shaft. Is that ok?.
3- Even more, in that case the spring mechanism, won’t work since the bore of the seal will be strongly connected to the shaft.
At this point I don’t know how to proceed after haven read lot of entries, I haven’t found out any answer to my question.
I'm a a bit lost with the different configurations, two different impeller types and also some different shafts, the ones with the male screw and the ones with the female screw. So I don't know if depending of what type of shaft I need a different seal.
Thanks you in advance for your help.
I’m‘ working on a K100 cafe bike, 1985 and the water pump is giving me hell big time. I wanted to rebuilt it and I have found out a few weird things.
By pump has been the one with the cast iron impeller. Originally with the shaft that had a screw going in through it (female) but the bolt got broken inside so I decided to buy another one and the only one I found on ebay is the type with the screw already built in in the end of the shaft.
Here is the rub, I have the shaft with the screw built in at the end, I installed the lip seal no problem. I got the water seal, see picture and got it in with no problem. At this point I have the seal installed so that from the impeller side I can push and action the spring on the seal. I’m happy, no cursing so far. Now I oil a little bit the shaft, and proceed to install it. Going through the lip seal was a piece of cake. As the shaft get into the water seal it seems it does not want to come out by hand so I decide to tap it gently and all of a sudden, pling!, a piece of the seal (the one I point with the yellow pen) comes the other end but the rest of the seal stays in place. WTF. It seems the shaft has a bit bigger that the seal bore and by pushing "breaks" the seal in to piezes, one that stays in place and the other ones comes off.
I removed the shaft and pressed back the little piece that apparently it was not broken. It clicked and went back to normal.
1- At this point I don’t know if I have broken the seal or not. It does not seems to me since I was able to put it back. Let say no
2- If I make the shaft coming through gently tapping here and there, the part of the seal in contact with the shaft will spin with the shaft. Is that ok?.
3- Even more, in that case the spring mechanism, won’t work since the bore of the seal will be strongly connected to the shaft.
At this point I don’t know how to proceed after haven read lot of entries, I haven’t found out any answer to my question.
I'm a a bit lost with the different configurations, two different impeller types and also some different shafts, the ones with the male screw and the ones with the female screw. So I don't know if depending of what type of shaft I need a different seal.
Thanks you in advance for your help.