Newer crf issue

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5/12/2020 10:04 AM

A buddy of mine has a 17 or 18 450.

He was having the top end rebuilt as maintenance.

Now he's got a new problem and it keeps blowing the water pump seal. Any ideas?


5/12/2020 10:07 AM

excessive blow by from rings
or plugged crank case vent (or a combination of the two )
some kind of high pressure rad cap that is allowing the seal to go before it pops off relieving pressure (head gasket leak)


5/13/2020 7:21 AM

Is the seal blowing or is it being installed backwards or is the bearing and shaft worn and need replacing?

Paw Paw


5/13/2020 8:12 AM

I believe he said the seal was blowing.