Reuse of shaft in water/oil pump K100

[kjott]

Hi!

I'm currently rebuilding the water/oil pump on my K100. Do you guys think its possible to reuse the shaft with the amount of pitting shown at the attachment?

[johnny]

greetings...

did you know inge karlsen from fredrikstad norway...

thanks for the photo... some will say smooth it out and roll with it...  if it was my brick id replace it...

i dont wanna be 2000 miles from home and have that failure... final drive or drive shaft ok because i gotts spares that can be frdexed... butts not that... and my aaa aints good for 2000 all at once...

j o

[kjott]

Ah, OK. In general, is the leakages coming from bad seals or a bad shaft like mine then?
I think the bike had oil in the water, because the walls inside the pump had a black layer to it (recently bought it).

Nope, did not know Inge :/

[Imlhaas]

What did you do?  I am looking at a similar issue and am unsure if I should use or replace the shaft. Inside of this pump was clean, just oil from the weep hole.

[volador]

Welcome. A closer pic would be helpful

Shaft looks like some minor discoloration. If it is not badly scored or pitted would reuse it. Smooth out with fine steel wool or Scotch-brite pad

[Imlhaas]

Here is another picture- It is hard to photograph.  I did clean it up, you can feel imperfection with your nail, but not deep or sharp pits.

[kjott]

I took a chance and reused it. The bike is still in assembly-mode, and therefore not tested to see if I did the rigth thing 

[kjott]

I filled the imperfections with superglue and smooted it that way. Dont know if thats a great solution over tlme... guess the answer will apear after startup :)

[volador]

I filled the imperfections with superglue and smooted it that way. Dont know if thats a great solution over tlme... guess the answer will apear after startup :)

Bravo ingenious use of superglue!

[volador]

Here is another picture- It is hard to photograph.  I did clean it up, you can feel imperfection with your nail, but not deep or sharp pits.

Looks good reuse without fear
let us know how is works out

[Imlhaas]

Put it back together drove it about 25 miles no leaks.  I had been getting about 4 drops of oil when I would stop and a wet oil pan. 

[volador]

Put it back together drove it about 25 miles no leaks.  I had been getting about 4 drops of oil when I would stop and a wet oil pan.

You use any sealant on the mating surfaces?

[Imlhaas]

I used Three Bond 1207b for the gasket material pump to engine and cover to pump.  I was surprised how easy it was to work with.  Put about 50 more miles on it today and found a bit of a drop at the weep hole, not enough to drop off and none on the oil pan.  Not sure if it was from the assembly grease or seeping, but I can live with that.