the_saint

What is the function of this part?
Can the engine be run this way?
Any idea why this part might fail?

btw the primary turbo took a beating with this failure.

Refer to previous post here

Thanks

thesaint

the_saint

Here is the image, from the front rotor.

vudoodoodoo

It looks like more of it could flake off...

the_saint

The remaining piece is quite solid. I think flake is a mild word to describe what must have happened for that piece to come apart.

Any idea as to the function of this sleeve?

thesaint

the_saint

Anybody have an idea of what this is, and what it serves to do?

thesaint

Want2race

I think thats a special material that is designed to seperate the water jacket from the exhaust passage.. Basically i think its a ceramic (thus can break easily) and conducts heat away well..

I think

the_saint

want2race: thanks for the response. It seems quite metallic to me though. It laid a beating to the turbine and didn't break into small pieces. hmmmm

Anybody else?

thesaint

cewrx7r1

iTrader: (2)

It is very evident that none of you are very experience with rotory engine basics.

That is called an exhaust port sleave. Its' main function is to keep the super hot exhaust gases from burning/melting away the otherwise unprotected aluminum of the rotor housing. It is made of a type of inconel. Inconel is used for very high temperature applications like jet and rocket engines.

Ever wonder why our turbo bolts and nuts are so expensive and are non magnetic? Inconel is the reason.

the_saint

This post makes ALOT of sense.

My question now is how to replace it? Can these sleeves be purchased without getting a whole new housing? Can the sleeve be replaced without tearing down the motor?

Where can more information be found on this? I looked through the shop manual but can't find any reference to it?

Thanks chuck.

Mike

Wargasm

You are going to need to do an engine rebuild to fix that and buy a new housing. The sleeves are replaceable, but I've heard from some people that it's such a pain the *** that's it's just not really worth it. I also don't know how you'd order that part just by itself. So now you're talking about buying a USED sleeve to put into a USED housing...

If I were you, I'd do a rebuild with a new housing.

Regards,
Brian

the_saint

Does this sleeve have something to do with EGR?

There is sooo much of the housing that is exposed to the exhaust gas that I cannot imagine that it would melt the jacket.

It looks to be a diffuser of sorts, as well as to divert some gas into some side ports but it is hard to see with a mirror.

Thanks for the help.

I appreciate any further suggestions, or experience.

Mike

93blackrx

whathappend to your turbos? that peice must of raped them like........well it must have bent something, right? whent did that happen?

the_saint

Check out the linked thread in the first post of this thread, it has all the pictures

thesaint

JOES95RX7

Its not there to prevent anything from melting (cewrx7r1) It is there to help channel heat through the exhauxt not into the water passages in the rotor housing. You can see this is its primary function very blatenly. It functions like a double pained glass window. there is a gap (air pocket) between the sleeve and the housing this is an insulation concept used to prevent heat transfer. I suggest doing a new motor becasue you are going to need a new housing which requires a complete rebuild anyway. Good luck let us know what you end up doing.

the_saint

I suspect I am going to go cheap for now.

Put everything back together and rebuild it when it blows up for good.

The turbos will fail prematurely. They were working 100%, blowing zero oil and boosting fine. They have 46k miles on them, but being unbalanced will likely experience a painful death in a while.

Whether or not the housing/block suffers injury will remain to be seen. I will be keeping one eye firmly planted on the water temp gauge though.

When the motor blows up (unlike the stupid housing piece) I will start fresh and go single. Wouldn't want to toast a new turbo with a piece of the sleeve, although I cannot understand how this piece died in the first place. The apex seals seem intact as far as i can examine without a tear down, and the car idled and ran fine.

thesaint