Hey all

I found this add for a pretty nice looking rx7 for $800 bucks only problem the guy says is there is coolant in the engine oil. Now I've worked on piston engines so I know this is bad. But I know f8ck all about rotary engines. My first thought was head gasket no big deal. Then I thought do rotary engines even have head gaskets? So I while I do a little research I figured Id ask you guys if you had any ideas why Coolant be present in the crankcase... Dos rotary even have crankcases?
So much to discover!
Cheers
Cabose

 

It would be very rare for coolant to mix with oil in the rotary. What would be required would be a failure of one of the outer coolant o-rings, or a freeze plug. About the only thing that would do that is random really bad luck, massive overheating, or freezing. Either way you are looking at a new engine.

How is he making this determination?

 

Does it have the milkshake fluid on the dip stick or do you see it in the oil filler neck? Was the oil ever drained from the engine and looked at?


^^^^^^^^ oh what he asked in the post above ^^^^^^^^

 

Im not sure how he determined this like I said I just read the add. He doesn't sound vary mechanical cause he said itd be fine to drive so Im geussing he just fliped the cap or maybe thought to pull out the dipstick.
If its just moisture on the cap and not coolant is that still a big problem?

 

Been sold thanks for your help though guys.

 

good to see, good luck with what you do next

 

Your So called "milkshake" is actually caused from heating and cooling.The Heat up and cool down Of the engine causes condensation and mixes with the Oil splash and comes out as "lung butter,Milkshake Fluid" whatever you want to call it.
It is kind of Normal,and shouldn't be taken as a "blown engine'.
Your Best bet is to make sure the Compression of the engine and it's cooling system(pressure test it) are Adequate when Buying a Rotary.

 

cracked iron?