water pump 04 wr450

replaced a water pump in my 06 wr450 and is leaking out the bypass hole

you have a bad seal

i thought so that's why i got new ones and a bearing so this wouldn't happen..

You may have an impeller shaft that has a significant groove worn in it from the previous coolant seal.  This causes the lip of the new seal to get "stuck in a rut", so to speak, and be unable to seal well.

 

Another possibility is that you installed the seals backward (see the picture below)

 

A third possibility is that your balancer shaft bearing on the water pump side is shot: http://www.thumpertalk.com/topic/691433-repeat-failures-of-water-pump-seals/

If this is the case, the bearing cannot be replaced with removing the engine and splitting the cases, because on the older models (pre-'07), the retainers were on the interior side. 

 

SealsLabeledsm.jpg

I just did this fix. I used a water pump rebuild kit and replaced bearing and both seals. If you follow this thread they realize the book is off and can cause confusion.

http://www.thumpertalk.com/topic/884253-wr450f-water-pump-leak/

Double check your seals as mentioned. After I put it together I was still nervous I didn't get it right, but no more leaks. So I'm good. If I did it again I would take pictures of both seals, just for reference and your not second guessing yourself.

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