Newbie - '04 Husa 450SE - water in oil

Hi all,

Brand new to 'bergs and this forum.

Got an '04 450 SE that had a broken timing chain. Got the top end all put back together. Runs great, but I can't keep water out of the oil.

As soon as I fire it up, the oil in the sight glass goes cloudy/milky.

I've replaced the water pump seal, shaft oring and the oring to the water passage seal into the head (all of which are under the gear cover). I've opened and closed the gear cover 4 times, to no avail.

I've read the posts about the water pump shaft seal problem, but most people are complaining about water loss and weeping, not getting water into the oil, unless I missed it.

From my read of the situation, there is no way I can be contaminating the oil with water from a blown head gasket (which is new, due to the top-end work), since there is no passage of oil through the head for the oil to mix.

I'm thinking that the only way I can be mixing water with the oil is through these two sealing areas (water pump shaft and water passage from pump to head). But, I'm also open to the idea I'm missing something.

Any ideas? Thanks!

Oil is definitely contaminated with water. Looks like pea soup.

Not sure how or where to find a crack in the head and not clear to me why that would immediately put water in oil in the gear box. I don't see a path for oil in the head other than the timing chain slinging oil onto drive train. Am I missing something?

Thanks for the ideas!

@bushmechanic thanks for the ideas. I will definitely check the weep hole.

I've been putting silicone on that oring between clutch cover and lhs case to hold it in place during assembly and make sure its sealing. I tried reusing old one first, replacing it with a new factory one, and last tried one that was slightly oversized in case there wasn't enough squish on the specified oring. I'm thinking of going back to the new factory oring with no silicone, but don't have much confidence it will help.

I tried an oversized oring on water pump shaft behind the seal, too. That one doesn't look like a water seal to me, as much as a first cut oil seal against the oil getting into the back of the dynamic shaft seal.

Can you clarify what you mean by the (wet) liner?. Not sure where to look for those additional 3 orings. TIA

I've replaced the orings and seals called out in numbers 60 & 65 in the photo.

@bushmechanic thanks again.

Yikes. That's deep in the lower end. I didn't go in there and wasn't planning to.

Any ideas as to how to t-shoot where the leak path is? I ran cooling pressure test and didn't get much of a leakdown. Seems like the water side is pretty tight to the cooling systsm pressure, at least at rest.