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1981 RM 125 draining coolant into the engine case.


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Hello everyone,

I have a 1981 RM 125 and it is draining coolant into the engine case. Does anyone have an idea where to look for the problem?

I have already changed the head gasket and base plate gasket and it did it again. Now I have the water pump and right side cover off looking for problems but can't see anything really bad. The only issue seems to be lots of wear on the impeller and pump housing.

Can anyone offer ideas and an exploded view of that side of the engine so that I can see how it goes back together.

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Thanks. That is what I thought as well. The mechanical seal is broken into 3 pieces. There is also a rubber washer on the end of the shaft under the bolt that holds the impeller on. Should that be changed as well?

Yep. the only thing that doesnt get changed is the impeller and I think Boyesen even has a kit for that. Try contacting them and see what he can do for ya. Early RMs made him RICH!

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