I am going to be replacing a bad freeze plug on the back of the engine behind the flywheel. I searched but could not find what size this plug is. Any help is appreciated.

 

this might help. http://www.pineappleracing.com/index...PROD&ProdID=49

 

I dunno if that is going to be the right size for the back of the engine though

 

post up what you find i'll be doin this in the next couple week when my car comes back from paint

 

i believe this is it but you might want to call and find out...

http://mazdatrix.com/getprice.asp?partnum=63-0000-9930

 

Well I pulled out the freeze plug and its pretty destroyed from removal but I think it is a 30mm, advance auto has a 30.03 mm plug I will try to put in but I would still like to know the exact size from the factory so if anyone knows that would be awesome.

I emailed mazdatrix and they did not know the size but it is the right one for the application.

 

is this the plug that causes a exaust leak when it goes bad?

 

no - this is the plug that keeps your engine from leaking coolant from the rear plate

 

I know what a freeze out plug is, there is another one on a S4 that causes a exaust leak, first I had heard about it was last week, sounded crazy to me but it came from a very reliable and informative source

 

^ i have never heard of such. But not this is not that

 

The freeze plug on the series four non turbo, if taken out, leads to the EGR passages and the exhaust. The Turbo series four and all series five do not have that *freeze plug* on the intermediate housing.

It's called "knowing your engine".

 

^ well apparently I "know my engine" cause I have an s5 TII.

 

ITS CALLED KNOWING YOUR ENGINE, lol what a douche, lol.

its called the engine is original to the vehicle and never been removed, I guess I am lucky that the engine is 20 years old in the car and never had to be worked on besides maintance.

its not even my car anymore, its the engine that came out of my convertible when I swapped the motor and I ran into the guy who bought it and it has the oddest exaust leak- thats when someone told me about a freeze out plug between the engine and the exaust manifold- first I had heard of it.

but hey thanks for all your help

 

The series five have a rectangular hole below the intake ports on the intermediate housing.

The series four non turbo have a round hole below the intake ports on the intermedate housings.

On all series five and series four turbo engines, the ACV feeds air into that hole and finally on to the exhaust ports (called Port Air).

The series four non turbos rotor housings are configured differently than the series five, so that hole, which is round on a series four non turbo, does not lead to the exhaust ports.

The difference in *configuration* of the rotor housings, is where the hole is drilled leading to the exhaust ports. The secondary air passage as shown in the attached jpg.

So putting a turbo intake manifold on a non turbo makes the ACV totally non functional, because the opening in the intermediate housing is round instead of rectangular on a series four non turbo and therefore won't mate to each other.

That secondary air passage is why "front and rear rotary housing are not the same".

That's thrown out there for people who are going to install a turbo intake and turbo on a non turbo series four car.

 

so.... on topic..... anyone by chance know the size? lol

 

The hole for the freeze plug YOUR interested in is 1.180" or 29.99 mm in diameter. So a 30mm dia freeze plug would be a good guess.

 

Thanks Hailers you are always a great help Ill use that 30mm then