Oil/water pump rebuild time?

[Motorhobo]

Not pretty. Is that at white ch!t corrosion from coolant? Whatever it is, I guess it's time to get the rebuild kit, huh?



This is pretty good...



Nothing in the Lieberry -- is this video also good for K75 or is there some 2V specific info missing/needed/available?

Thanks for any help --

Van

[Inge K.]

http://hrsbstaff.ednet.ns.ca/bvogel/K100/oil_pump/oil-pump-seals-replacement.htm

[Motorhobo]

Awesome -- thanks Inge -- I'll set about this today while all the fluids are still drained from the fan motor replacement.

V

[K75RT Keith]

I'm assming this is off the 94 or 95 right?  The earlier versions like the one on my 90 are different and require additional parts or a kit to rebuild

[Motorhobo]

Its the 94. Bob's isn't selling a kit for this rebuild -- apparently it's just a collection of rings, gaskets and impeller they sell separately.

We'll see what it is when I get it apart after  lunch and during beer.

[Motorhobo]

Ok -- so before I tear this apart I'm wondering whether someone can explain why some corriosion on the outside of the cover would definitely necessitate a rebuild. The instructions Inge linked to say to put some black RTV on the cover before putting the cover back on. Is it possible that just the cover is leaking?

I will do the rebuild if I need to, but not too thrilled about doing unnecessary work. If there's not supposed to be any coolant between the pump and the cover then I'll rebuild the pump.  Otherwise, I'd just reseal the mating surface between pump housing and cover.

Comments?

[tg4360]

From what I see, that's not corrorsion as much as something has eaten the paint off the pump.

If it's just paint then you probably don't have a pump problem.

TG

[rbm]

Are there indicators of leakage, such as foam on the oil in the sump or oil dripping out of the vent on the pump.  Either indicates worn or broken seals that require  a rebuild.  If not, signs may point to renewal of the RTV around the water pump cover.

[Motorhobo]

It is corrosion and i assumed it was from a coolant leak around the water pump cover -- I'm thinking that the coolant reacted with the paint around the cover to generate that white crap. The corrosion has to have a cause and I can't think of anything else in that area except coolant, and I didn't see any drips leading to that corner from above.

I didn't see any drips under the bike after runng it and i ran it several thousand miles last summer. So if coolant is getting by the cover, it's happening very slowly, not enough to drip but just enough to react wth the paint. That cover has no gasket. If the cover has contact with coolant by design, then it's reasonable to assume that either it wasn't installed with any gasket sealant, and reinstalling with gasket sealant could fix the problem. If the cover isn't supposed to have contact with coolant, then I have to wonder why anybody would put gasket sealant on it and I have to think about why the coolant is where it shouldn't be.

Bottom line is --- I don't know if the pump needs a rebuild based on just the accumulation of corrosion at that spot. I'm going to run the bike and keep an eye on it for now unless someone tells me within the next couple days why that's a bad idea.

[Motorhobo]

Are there indicators of leakage, such as foam on the oil in the sump or oil dripping out of the vent on the pump.  Either indicates worn or broken seals that require  a rebuild.  If not, signs may point to renewal of the RTV around the water pump cover.

Come to think of it there was some oil gunk down in the area of the pump. But that might have been because I dumbass put on the oil filter cover with and old gasket or no gasket and oil was leaking from there.

I think the best thing to do at this point is clean it up real good and run it a couple hundred miles then take a clean cloth to it and see what I get.

[rbm]

I think the best thing to do at this point is clean it up real good and run it a couple hundred miles then take a clean cloth to it and see what I get.

Exactly!  That is the best action to take at this time. Monitor the bottom of the sump and oil pan for signs of oil spray originating from the pump area.  That could indicate seals.

[Motorhobo]

Thought I'd update this issue ---

To recap, there was some corrosion around the oil pump cover and some sludge in the area. The corrosion I assumed was from coolant leaking past the cover.

I thought I'd need a pump rebuild, even bought the seals to do the job, but instead decided to just pull off the cover and take a look. Whatever sealant was on the cover was long gone, so I just sealed it up again with RTV and put it back on. Since then, no sludge and no corrosion -- moral of story, the factory sealant doesn't last forever, so if you have leakage there unless it's oil from the weep hole you might just need to pull the cover, reseal and reinstall.

Hope this info I'll be of use to someone...

Van