My friends 88 T2 with a S5 turbo is getting coolant in the oil. I told him the only thing it could be causing this is an outer coolant seal is leaking or possibly the turbo. Can anyone confirm this? Or offer another theory?
Thanks in advance.

 

Coolant seal. for sure. If it was the turbo, you wouldn't be mixing it inside there. It would just burn oil.

 

This engine had water and oil mixing due to a cracked intermediate plate

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/j-spec-intermediate-housing-failure-726181/

 

That thing^^ is f'd up... His is getting just a small amount in the oil. So I suppose either a crack somehwere or a coolant seal must be bad. Sounds like its about time for a

 

Slow down a sec. Is it on the dipstick or is there just moisture in the fill tube? It is normal to have condensation building up in the fill tube.

Coolant in the oil happens very rarely and is NOT from a coolant seal blowing, it's from a cracked iron or bad freeze plug.

A blown coolant seal or groove puts coolant into the combustion chamber, not the lubrication system. The lubrication system is sealed from the combustion chamber by the side and corner seals, then the oil control rings and o-rings.

Please stop giving advise when you don't know what you're talking about. It has the potential to cost people alot of money.

 

Take your own advice, If an outter coolant seal blows on the bottom of any of the housings/irons you will get coolant into the oil pan.
Granted it is not very common but it could happen.

 

^^ This is true. I actually have had, oil in my coolant. Was the outter coolant seal. Also I kind pinched the seal. (of course on the bottom on the chamber.

 

That's a good point. But that doesn't warrant talking to me like a dick, nor does it explain this:

My point isn't that you're a dumbass. Cuz that probably isn't true. My point is that blanket statements are dangerous and have cost people lots of $$$ in the past. We don't even know the situation 100%.

Say this guy has water/oil mix in his fill tube, which isn't uncommon and he said it's just a little bit... which sounds funny to me because there's no little bit of water in oil. You get any decent amount in there and the whole mess turns white.

Anyways, He shows his buddy who thinks rotaries are pieces of **** and says he needs a rebuild cuz he's been waiting to say, "i told you so." You just backed that up and he might go out and spend $2500 on a rebuild +R&R.... meanwhile all he needed to do was take longer drives.

The dude asked for other theories.

 

Thanks for the other theories, but I did not say it was a coolant seal for sure, that was someone else.
I know exactly what you mean about the water on the dipstick and what not and it is much more than that. The engine is getting enough coolant in the oil to make the oil milky after maybe 100 miles or less.

 

Do a pressure test, and find out for sure. I know about the milky filler tube as well, happened to be before. Just cleaned it up and was fine.

But oil in the coolant, I would just double check by doing a pressure test on the radiator.