86 k100 water pump seal using new bolt shaft and original type cast impeller

[Mwilson904]

Hello,
This assembly was incorrect when I got the bike (but they put the seal in backwards when they tried to fix)
 I read ever post and video but....
Had the new type shaft (that accepts the bolt) put in new seal and bearing, installed as per threads, worked perfectly getting in the new seals and pulling the shaft thru.
Here's the hitch
I didn't have a new blade type impeller and/or spacer.  I put the cast impeller on, and there was no spacer or room for any spacer.
The impeller has a lot of resistance to turn (sorry I don't know the torque)
Question:  Does this cast impeller compress the spring in the new seal too much that it will cause this to fail?

It is assembled and the impeller will be a pain to get off, Local BMW dealer only had original impeller diagram and didn't know about the newer fan type impeller.
Sorry for the millionth water pump thread, but I could not find this exact configuration and answer just reluctant to put back on.

Thank you

Thank you

[Laitch]

Question:  Does this cast impeller compress the spring in the new seal too much that it will cause this to fail?

The dealer didn't know about the new impeller? Take it to the owner of the dealership.

BMW's parts fiche makes it clear that the cast impeller won't work with the replacement seal and spacer. The dealership is at fault for selling the incorrect part to you for its own convenience. They need to get you a new seal, spacer and the correct impeller. Bargain for a parts discount to compensate for your labor of installing the incorrect part. Otherwise, get a refund and order online. You'll probably get it quicker anyway.

After this is settled, consider posting your experience in the Dealers~Independent Wrenchers Section.

[Mwilson904]

Thanks Laitch,
I was able to remove the impeller and get it free up by tapping the shaft back a tad.
I used this method http://hrsbstaff.ednet.ns.ca/bvogel/K100/oil_pump/oil-pump-seals-replacement.htm
And everything looked the same with exception to the impeller and lack of spacer.
It appears that the cast impeller (listed as a "rotor") could work if I ground down where the spacer would go, seems to be about 1/16" too deep therefore putting too much pressure on the spring seal.

Here is a picture of mine installed, with slip-ring seal 11411741870, and shaft seal 11411460329
Would leaving these in place finding a new stamped steel impeller with the spacer would work?

All threads I saw already had the newer stamper impeller so didn't address using the cast one of not.

Most diagrams have the cast "rotor" with a spacer, as mentioned I don't know how this one was prior to previous owner trying to fix.  I looked at what came up when I google BMW fiche, and the diagrams I found show the cast, but I must be looking at something different.
With this said, do you think a new impeller with spacer resolve this?
I haven't been able to find them online so far but will keep searching.

Thanks!

[Mwilson904]

I did just find this service bulletin showing the updated impeller and spacer, along with a different slip ring part number.
http://hrsbstaff.ednet.ns.ca/bvogel/K100/download/K100-service-bulletins-and%20special-tools/1100102.pdf

[Laitch]

With this said, do you think a new impeller with spacer resolve this?

According to what's published in the K100 section of the fiche, the stamped impeller is required along with a new slip-ring seal, spacer bushing, shaft seal and o-ring. You shouldn't be grinding anything. The situation is apparently different when rebuilding a pre-1990 K75.

You should be consulting with the guys who sold you this stuff while you all look over the parts fiche.

[Mwilson904]

Agreed, I'll take everything in there and review with someone there that has more experience with this and work with them.  They seems like nice guys, the gentleman that ordered the parts had no knowledge of the k100 or older bikes, but I know there are some guys in back that have more experience with them.

Thank Laitch!

[Laitch]

You're doing a great job digging out information and answering your own question. I think it's time the dealership helps you get the parts that are required.

[Inge K.]

The last seal that was used together with the cast impeller had part # 11 51 1 460 348, change was -89.

[Mwilson904]

Thanks Laitch and Inge,
I sent all information to the dealer, they got with the manager involved and he looked into it.
He said that they had 6 "updates" or changes to the water pump for the k100.
I went ahead and just ordered the latest kit that includes the impeller, spacer, and slip seal, I figure that I should be able to remove the shaft and re-install without damaging the shaft seal that I just put in.

I didn't asked for any deal, it cost $69.00 and they are overnighting it.  But I demanded that I get free bbq on any Saturday (I heard they have free bbq every Saturday) and the one thing I'm good at is eating, so they will pay dearly as they are only a couple miles away. 

Thanks for your help!

[mw074]

 The local dealer here gets $99. total to rebuild the pump with the latest update ( off the bike. )

[Laitch]

. . . the one thing I'm good at is eating, so they will pay dearly as they are only a couple miles away. 

See that they do! Thanks for the followup.

[Mwilson904]

Well now I have an extra slip seal, the new one they sold me was the same as I purchased to begin with (I didn't have my original invoice with me, but I asked as it looked the same) "nope it's not the same, its the updated seal"
It was the same, but the impeller and spacer along with the original slip seal I bought fit like a glove.
While the gasket is setting up, thought I'd look at the back brakes.
I've never seen brake fluid in solid form before! 
This is becoming a great lesson in patience.  I have a new found respect for regular preventative maintenance  :musicboohoo:

[Mwilson904]

Water pump seems to be working and is not leaking or whining, thanks for your help!  :riding: