I pulled my water pump off to see if this is where I'm getting a water/oil mix. The pump did have some signs off oil in it. If this is the problem area I would think anti freeze would go to the crankcase not vice versa right? More pressure in the cooling system then the case? What pessure does the cooling system operate @? Tried to rig up the pump to pressure test it but it really didn't work well and showed no leaks. Anyone have a spare pump kicking around? Is there a way to replce the seal behind the impeller? I heard from a Honda Mechanic that the water jackets failing can be a common problem on these machines.

 

you can replace the steel behind the impeller but the water pump is sold and an entire unit. About $160 retail. Good luck!