Here are some more info on my topic. Please see enclosed pdf for more understanding of my problem regarding change of seals in water-/oilpump on a BMW K1100 LT, 1997.
BACKGROUND
I have bought and used special tools for the oil- and waterpump seals and failed with the mechanical waterpump seal. I ended with a waterleak for some reason and I can at least rule out corrosion damages on the shaft, since I bought a perfect and brand new one.
WRONG TOOL?
I believe the tool I purchased for the waterpump seal is not optimal, or not even the proper one for this. The mentioned tools are sold by BMWbayer in Germany. Their tool for the oil seal works perfectly. It is marked Bosch 11 1 640 (83 30 0 401 442).
The other tool however, the one for the waterpump seal, is pressing on just the springloaded part of the mechanichal seal, and therefore stresses this part - and also compresses this part too much when it settles on the shaft. Or is there perhaps another way of using this tool? I haven´t figured it out.
THE OLDER TYPE OF SEAL
The original rubber seal for the waterpump, the one I removed from my bike, is perhaps the seal used with this tool? BMWbayer claims it is the correct and up to date tool and have had no complaints from the 20 sets sold (apart from my remark/confusion).
TOOLS THAT MAY WORK
At
http://largiader.com/articles/waterpump/ there is a reference to what i believe is the correct BMW tool set. He writes:
”The 83 30 0 401 624 tool set (was 90 88 6 11 720) for these pumps ...
... 11 6 724 mandrel for installing coolant seal. This presses the seal into the housing and also supports the inner part of the seal and leaves it with about 1.5mm spring compression.”
SIMILAR TOOL FOUND HERE
Euro Motoelectrics and Max BMW Motorcycles both sell a similar tool.
I have ordered mine from Euro Motoelectrics but it is now stuck and delayed on the FedEx hub in Belgium.
(
www.euromotoelectrics.com/product-p/pumpkittool628.htm)
(
https://shop.maxbmw.com/fiche/PartsDetails.aspx?source=catalog&diagram=ST_11%206%20724)
VIDEO
A guy on Youtube shows how the tool is used.
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Since this repair seems to come with at least one or two trials before it is successful, I will keep you informed on how my repair develops with this other tool. Hopefully it will save you some time and money.