Milky Oil-not from coolant pipe o-ring or water pump gasket

[kjh]

On a new top end rebuild I was getting milky oil, so I drained it, replaced the coolant pipe o-ring and water pump gasket again just to be sure(did it originally).  Ran it again and Oil was milky right away.  After further inspection I found oil coming out of the bearing behind the sprocket.  I am going to rebuild my bottom end and am wondering if the water in oil can be from something in the lower end or do I have another issue?  If its tied to the bottom end I may try to do lower end without taking top end all apart again since I just did it but am unsure why I have water in oil.

[Finch]

water pump seal

[crazycracker520]

What kind of head are you running? Stock or aftermarket?

[Finch]

head would have nothing to do with trans oil...

[kjh]

water pump seal done twice.

[crazycracker520]

Sorry had a brain fart!! Lol don't know what I was thinking!!

 

crazycracker

 

 

[hoppedupandcutdown]

Then I'd try a new impeller shaft and seal

[Surfrjag]

Once i went from atf to reg oil and it turned my oil super milky white like your describing. What oil have you been using

[03DMshee]

Still have overflow bottle? Have your vent hoses switched with coolant hoses? If you have the vent hooked to hose to overflow you will get coolant directly to case.....2 cents...

[hoppedupandcutdown]

Still have overflow bottle? Have your vent hoses switched with coolant hoses? If you have the vent hooked to hose to overflow you will get coolant directly to case.....2 cents...

X2  -That would also explain pushing oil out the sprocket seal

[kjh]

i do still have an overflow.  and i just got done with a frame up build.  Its possible thats the cause I will check it out.  thanks for the replys.

[kjh]

Just checked overflow lines are hooked up correct.  Using Maxima MTL 80 Wt oil.

[03DMshee]

Double check those lines....I'd eliminate coolant bottle for time being and run it and see what happens..vent Trans atmospheric and block off waterpump vent......either that or you got major gasket leak....

[Starwriter]

Initially, you mentioned the waterpump gasket. Then later you mentioned that you replaced the seal twice. Just so you're not calling an apple a banana, you did replace the waterpump seal that presses in behind the bearing, right? There is a water side and an oil side to the seal.

 

Also, make sure the white plastic vent elbow is in the top of the case near the rear motor mount. If it's missing, water from splashing through puddles and from washing the bike can get in there.

[kjh]

I am not sure, I can't remember so I will take it apart and double check that, thanks for the reply.