oil inside rotor housing
 

Hey guys, too much oil found inside rear rotor housing. Any ideas what might have caused this. Attaching a pic of my sayings. Thank you so much.https://cimg6.ibsrv.net/gimg/www.rx7...ecfcae069c.jpg

Possible oil control ring failure, if you dont find any in the intake manifolds.

If you have oil in the manifolds, it could be turbo related.

^^ +1

Thank you all. I'll check oil control ring since intake manifold is clear. The car was sitting for more than 5 months and it had 3000km since last rebuild. Is it possible for the control ring to get dry and cracked loosing sealing because of that? Or was just wrongly placed during the rebuilding?

The oil control rings typically don't dry out or anything, the only thing I've seen that kills them is very high oil temps and old (like 20 years old) O-rings.

It's hard to tell how much oil is in the engine, if it's been sitting for a while in theory some of the oil that was in the rotor could have dripped past the seals into the combustion chamber, but it should be a small amount if any. Or, if someone tried to put oil in the motor to build compression to start it.

It is quite possible that someone screwed something up in building the motor.

Dale

I found out that rear trailing spark plug did not fire due to signal wire cut on msd coil but I believe this is irrelevant with the oil found.By the way is it ok if both trailing spark plugs fire at the same time. I found out that the electrician had connected in order to do so!!!

Hmm I know on 2nd gens its definitely not ok. Someone else will have to chime in on 3rd gen.

Both trailing plugs firing at the same time is SUPER bad, that can easily lead to detonation. Leading is OK (from the factory they both fire at the same time).

Each trailing plug has to fire exactly when it's supposed to.

Dale

Correction! The trailing signal wires (L/W - R) which are responsible for firing are connected the right way. The ones that are connected all together are the +12V wires (B/R) where this is normal. A great relief for me.....:-).I'll move on with the engine bay total innovation and I post some pics. Thank you all!

Resurrecting this. Did you find out what the source of the oil in the housing was?

https://cimg4.ibsrv.net/gimg/www.rx7...6850c87f73.jpg
https://cimg0.ibsrv.net/gimg/www.rx7...0c84bca65a.jpg
https://cimg7.ibsrv.net/gimg/www.rx7...e72bff8771.jpg
I did not reassemble the motor yet but while I took everything apart I saw what you can see too in the pics attached. Some kind of deposit, looks like wire shouldering leftovers, that somehow passed through the chamber and stuck just beneath the oil o-rings. You can see the excess of oil on that side housings. All othersides were clean. Just that one was messy with oil. I suppose that thing allowed oil passing inside the chamber through the tiny gap created between oil o-ring and side housing. Thus I had a lot of white smoke. I can't see any other reason since everything else found in a good shape. Now I am wondering where this came from. Because the smoke did not started just after last rebuilding where I may say that my mechanic left it inside while reassemlbing. I had 3000 miles without smoke. It came just after. May be it was lying somewhere in the oil tubing and when cirlculated just stuck there.

Those metal oil control rings look worn pretty well past spec. Measure the shiny part. Should be .5mm max.