I am working on a rebuilding a s4na. before i pulled the motor it seemed to run fine, accept smoaked like a fog machine.(whiteish) I striped the motor down to the block and notaced the exhaust port itself is loose. Dose that mean i need a new housing? I have 2 spare motors but they are s5na's. I have one torn down and i know i have 1 good housing, and i can probably get a second one from the other motor, once i get that stupid flywheel nut off. I know that if i use s5 housings i would need to use them in a pare, but if i use them can i still use the s4 ecu?

 

The sleeve is held in place by a couple of roll pins, if the pin bore is worn, you could try a larger roll pin after removing the worn one, or you could try an allen-head bolt (that will sit below the housing edge) that may hold it tight...Don't need a new housing just for the sleeve being loose, unless you're looking for an excuse to get one