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Blakduc1
10-21-2009, 12:59 PM
Anyone know the best way to remove the impeller from the water pump/ oil pump shaft of a K100RS? Bolt is removed but seems stuck....

dp
Bob Hancock
10-21-2009, 04:25 PM
Plastic explosive always works well for me.
Blakduc1
10-21-2009, 05:05 PM
How do you get that (plastic explosive) these days????
Bob Hancock
10-21-2009, 05:08 PM
I make it in my secret lab and sell to dentists for root canals. Works great for hang nails too.
Don M
10-21-2009, 08:51 PM
WD40 and a heat gun?:innocent0001:
CycleRob
10-22-2009, 02:27 AM
Blackduc1,

From the parts diagram below it appears it really IS just stuck:

http://www.maxbmwmotorcycles.com/fiche/DiagramsMid/B0000139.png?v=10262009


I'd apply a heat gun from a foot away to heat it up to just under water boil and give it a few gentle taps. Are you replacing a leaking seal?


.
Bob Hancock
10-22-2009, 08:09 AM
WD40 and a heat gun?:innocent0001:

Good advice, but use Aero Kroil....the oil that penetrates. I have a heat gun and the Kroil.
Blakduc1
10-22-2009, 09:41 AM
Thanks, guys, for the input.

I talked to Walt and he suggested putting the bolt back in the end of the shaft and tapping it with a hammer. That did work, but it was still reluctant to let go. If that had not worked, Danny had offered a gear puller that may have done it.

The seals were totally gone and corroded. Now I am not sure if the shaft is re-usabel or not. But I do have it apart and cleaned now.

Thnaks.
dp
sharpeunit
11-03-2009, 11:35 AM
Doug,

Bad news, install of seal is not a do it yourself job. On my old K-bike I had the same issue. You will need a new shaft as your's is pitted, a new impeller as they have been updated to mate with the new shaft/seal and a dealer will need to install the seal with the correct BMW tool so the plastic/metal seal is correctly installed, and not ruined.

Any questions give me a call. Jonathan
Blakduc1
11-05-2009, 09:03 AM
Doug,

Bad news, install of seal is not a do it yourself job. On my old K-bike I had the same issue. You will need a new shaft as your's is pitted, a new impeller as they have been updated to mate with the new shaft/seal and a dealer will need to install the seal with the correct BMW tool so the plastic/metal seal is correctly installed, and not ruined.

Any questions give me a call. Jonathan

Thanks Jonathan.
Tech articles and Clymer describe how to install seals without the BMW tool. Can be done.
Yes I need a shaft and am looking for that now. Impeller is OK on this '87 bike. Not the old style.

dp
sharpeunit
11-05-2009, 10:45 AM
I have a possibly usable shaft from my old "85 bike.
Blakduc1
11-05-2009, 06:28 PM
May need it. How much you want?

I think Matt has one here in Athens. Let me check on that first I recon.
Also, isn't the 85 one a little different than 87? had a nut on the end or something?

dp
sharpeunit
11-06-2009, 08:37 AM
My shaft has a threaded end on the impeller end, does this match your take off?