Question on Twin disassemble and internal gasket
 

I'm planning to disassemble my twins. The reason is that I bought a used set of twins in better condition, but the exhaust housing of the secondary is badly cracked, so I wanted to use my old exhaust housing, which is cracked also but way better than the "new" one. Here is a picture of the part that has to be exchanged:

https://cimg1.ibsrv.net/gimg/www.rx7...ea3927d847.jpg

My first problem is that I didn't find a chapter in the FSM on how to disassemble the turbos. But than I assume its just a matter of unbolting some bolts. The second problem is that there is a gasket between the concerning exhaust housing and the rest of the assembly. I wasn't able to find that gasket online. Can someone give me a part number please or hint me in the right direction? Is it possible to reuse the gasket (of course provided that it is in good condition)?

Is there something else that has to be considered when opening em up?

Thanks a lot in advance!

A lot of those gaskets can simply be reused.

The important thing is getting the clock right when you put them back together. It helps to have a spare manifold, or just use the one on the car to get everything pointed the right way before snugging the bolts down.


Some cracking on that housing is totally normal, and generally doesn't cause any issues unless the cracks spread further than where the gasket seals against the manifold.


The REALLY bad looking ones seem to come off of cars with a bad leading coil, tends to raise the EGTs quite a bit.

Where do I find the torque values for the bolts when putting it back together?

Thats the "new" one:

https://cimg1.ibsrv.net/gimg/www.rx7...dfa4d742ed.jpg



And this is my old one:


https://cimg8.ibsrv.net/gimg/www.rx7...c663bfa0d5.jpg


So I think the change of the exhaust housings is a no-brainer, isn't it?

New one looks more likely to have an exhaust leak going by the crack length going beyond the gasket.

There's no torque spec for the bolts, just use a standard torque spec chart for M8 inconel if you're concerned. You'd probably be wise to lubricate the bolts heaps before loosening - like overnight - they're very prone to galling and seizing. A tap to clean up the threads before reassembly wouldn't be a waste of time either.