In the last installment "Geraet" passed it's inspection, got registered and I took for the first few smaller shakedown runs. Whilst being "legal enough" to take part in traffic, the old girl was pretty good from afar, but far from good.
First on the list were the brakes. The pads were at least twenty years old and definitely had seem some oil or other lubricant at some point and whilst proper steel braided brake hose improved the overall brake performance quite a bit yet those calipers were definitely dragging.
The blue Brembo pads, even though being the "budget" organic version already made a huge improvement.
Next task: have a spare key made. I only had one original key and that was the folding one, which felt distinctly wobbly in the joint and I was quite afraid of breaking it off.
Both gearbox and final drive oil were also definitely well overdue for a change, yet revealed no sparkly surprises.
As oil had been sitting forever in both the gearbox and final drive, I gave them a good wash with some diesel.
And then admittedly after two or three rather spirited test-rides
the engine started to look like this.
And a bit more coolant and less oil on the other side.
In other words: waterpump-seal-time.
Now THIS is officially a lot of dirt and oil on top of the waterpump.
After a moderate amount of cleaning.
Doing the seal swap requires one special tool and I personally would highly recommend you buy it at the shop you buy your seals too as the stock seal is only about 9mm tall and the (improved) aftermarket one, over 11mm. Which means, I had to alter the seal-driver to take those extra 2mm into account.
The pump shaft only needed a quick cleanup with a piece of scotchbrite to be all shiny again. The pitting is well within the coolant section and not where the seal runs.
Checking the height of the new seal.
So there's an official tool from BMW to drive the seal in, called the "BMW coolant seal installation mandrel", which has the following dimensions:
Outer diameter 40mm
Step diameter 28mm
Center-hole 12mm
Step depth 8mm - which I therefore changed to 10.5mm
Even though it may seem counter-intuitive, there should be about a 2mm gap, so when tightening the waterpump rotor bolt to spec, there is the correct pre-load on the seal.
Installing and aligning the pump, especially as there's an o-ring on the back, is a bit tricky, but nothing out of the ordinary, just expect to have liquid gasket on your hands everywhere.
As there's literally no way of ever cleaning the gunk out from on top of the water pump, I decided to trim it to size quite notably so riding in the rain would effectively wash the road dirt off.
... and only a few days later, I completed the first 1000km on the beemer.
At the time of writing it's almost a thousand more and whilst it is still not what I would call an exciting motorcycle, I'll admit that it is undoubtedly a very useful one. So useful that I'll soon have to replace the rear tire for the first time.
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