MM600 water pump leaking after replacing housing

[Yamaha_Ryder]

Had to replace the water pump housing on a MM600 as it pretty much sheared off due to a broken motor mount (the sled has 8000k on it!). Got the new housing (which is now a different part, that looks a lot stronger). I have the thing back together and it appears to be leaking out of what I guess is a weap hole in the housing. The seal between the bearing and the impeller looks good. From looking at the diagram, I am putting it back together right, but could be wrong...

Any tips/tricks? I'm going to go ahead and order the seal, but would like to have the sled running this weekend.

 

[attak06]

water pump leak

make sure you didnt make the coolant to water mix stronger than 50/50. some water pump seals will seep if the concentration is too thick.

 

[paulharris]

so you are re-using the stock seal that has 8000 kilometers on it??? if thats the case its not surprising its leaking, you need to put a new seal in there. Its been a long time since i did one, but if i remember correctly you need to put some RTV on the outside of the seal where it fits in the housing also to prevent a leak.

 

[Yamaha_Ryder]

New seal is on it's way. It's not leaking from the seal from the looks of it though.

 

[paulharris]

these are the same style of teflon seal that we use in pool pumps. i replace them ALL the time....the old one looks just fine with no damage whatsoever....but sure enough they are leaking....put a new one in and leak is gone.