when rebuilding my engine i realized i needed some new housings... i used the irons and one rotor housing (ported to match the other) from another s4 car and a 35k mile rotor housing that i suspect is from a japanese rx-7.

the rotor housing is different only in appearance, aside from a hole that goes all the way through to the cooling channels where the lower intake connects to it. this is giving me huge problems. the coolant isn't leaking into the intake or engine (luckily), but it is leaking up and pooling between the intake and housing.

has anyone else come across one of these housings or have any idea how to remedy the problem? i'm thinking of finding a way to permanently plug the hole and reinstalling the lower intake with silicone sealant on the gasket.

 

Describe your entire engine set-up a bit better.

The hole you describe feeds coolant through the intake manifold on TII's to the turbocharger. Both the front and rear TII rotor housings normally have this hole, as it allows them to be swapped front to rear, even though only one of the holes feeds the turbo.

It sounds like you left out one of the o-rings.

 

it's a naturally aspirated setup... all of it except for that one housing apparently. i'm going to machine a plug for the hole and press it in, i don't see how it would interfere with anything as long as it doesn't protrude and make the manifold seat badly. thanks for the info.

 

So you used a TII housing without the o-ring? That'll do it.

You can press in a freeze plug if you find one small enough or tap in an AN plug. You could attempt to cut a hole in the stock metal gasket and then use the stock o-ring, but I think trying to cut the stock metal N/A intake gasket might be more trouble than its worth.

Have fun and good luck!