Is this water/oil pump salvageable?

[Laitch]

Strangely the seal on the thermostat seems too large!

Your thermostat's seal should fit closely around the perimeter of its flange. There should be an o-ring in the picture, too. View the relationships in this post.

[stokester]

The pump didn’t fail as such, it just had the usual oil leak from the front so I knew it would need at least a rebuild. Turns out it was too far gone.

When I drained the coolant I don’t think there was any oil in it, but it was the green coolant which I believe shouldn’t be used on alloy blocks.


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Color of the coolant is not always a good indicator of the proper coolant.  My K75 manual has a statement "Caution Use only antifreeze and corrosion inhibitors free of nitrite!"


As mentioned before I follow Bob Fleicher's recommendation that the coolant not contain; nitrites, silicates, phosphates and borates.
I was looking at the ingredients of a number of different coolants today and found that Prestone Extended Life, which is green, is the only one that is labeled as being silicate, phosphate, nitrate and borate free.  The others including Peak Long-life (phosphate and silicate free), BMW Auto (contains silicates), Motorcraft Gold (sodium nitrate), Prestone DexCool (?) don't do a good job disclosing the ingredients.


What I found is that most do not do a good job of disclosing the ingredients and color is not a good indicator of compatibility with our machines.

[lilau3]

One of my mates bikes radiator seals had the same thing happen. Both seals go onto the actual cap the one shown should fit up into the cap.

The oversized seal is definitely from the thermostat. The other seals can be seen in this image:

[Martin]

The large square section "O" ring should push right down into the outer recess of the filler cap. It seals the cap against the top edge of the filler neck.
Regards Martin.

[Laitch]

The oversized seal is definitely from the thermostat. The other seals can be seen in this image:

Regardless of what you have, the gaskets and o-ring need to fit the parts and assembly as indicated by the photos and diagram in the link in post#25.

[drneo]

The pump didn’t fail as such, it just had the usual oil leak from the front so I knew it would need at least a rebuild. Turns out it was too far gone.

When I drained the coolant I don’t think there was any oil in it, but it was the green coolant which I believe shouldn’t be used on alloy blocks.


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Not to highjack the thread, but I have a K75RT that is doing the same thing. The IBMWR has a good explanation to rebuild, but is the general conscious  still that it's a good idea to attempt to rebuild (either yourself, or take it to a dealer) vs. buying a replacement?

[Laitch]

. . .  is the general conscious  still that it's a good idea to attempt to rebuild (either yourself, or take it to a dealer) vs. buying a replacement?

If you have the money to buy a replacement, buy it and bolt it onto the bike. If you have the money to pay a dealer to replace or repair it, pay the dealer. Only attempt repair yourself if you have a proven ability to follow instructions, patience to work carefully with focus, and access to tools, space and time to do the work.