250r coolant in trans fluid

[phillyscars]

My 86 250r is losing a small amount of coolant into the transmission fluid. From what I've read on here, if my mechanical/water pump seal is bad, wouldn't coolant leak out of the weep hole on the water pump cover? Nothing is coming out of the hole. What should I do to fix this?

[TeamGeek6]

Nope. Only one way coolant gets in, and its past the pump seal.(unless the head is leaking AND the crankcase seals are leaking at the same time.) Its a two piece ceramic seal. Theres a regular shaft seal on the pump shaft. (as i recall). Make sure the counterbalancer bearing isnt gone, that lets the pump shaft wobble. The pump seal is spring loaded, take it apart and see if theres junk in the seal.

[i58829]

Ok this sounds pretty simple i just want to bump it because i have a similar issue. My 85 R runs great, i had it out last weekend and it was running as good as it ever has. I stuck a fresh quart of oil in it before i left and i noticed some watery oil seeping around the stator wire inlet. It always had a sealing issue here but it never looked like this. I guess after sitting for 5 or 6 months it wasn't happy, i only started it once in the winter.

Anyway to get to the point, i took off the smaller water pump cover, the impeller shaft moves maybe 1/16 of an inch in any direction, there's not coolant being burnt as the exhaust smells like it should. What do i need to replace this and is it easy enough to do/access without pulling the motor out of the frame? If it has to come out the frame will be pc'd so it will be a lengthy project but i'll do it right this time. The motor only has 22.5 hrs since it was built. Thanks TC...

[scottp597]

I am also looking for info regarding fixing a pump seal. Can it be done by removing the water pump cover ( I haven't looked inside yet ) and removing the impeller?

[Yamaha_Rules69]

You will most likely have to remove the clutch cover and water pump cover, as the seal is installed from the inside.

[scottp597]

Thanks for the help, I appreciate it.

[Dirtcrasher]

^ Be careful bud, thats a special seal and if you aren't careful installing it, you'll ruin it.

I think its about 35$ too isn't it??

Anyhow, please try to read up on it beforehand in the shop manual and if you use a socket etc etc to install it, just watch whats happening. Plenty of people screw up that seal install.....