I removed the M/C from the S3 this weekend and dismantled it.
The bore looks good, but I'm not sure what rebuild kit I should buy for it.
Photos below show:
1. cylinder and inner assembly, in order
2. As 1 but from a different angle
3. Tav for S1 Aurelia M/C
4. M/C diagram found on this forum for an Augusta - this seems similar to mine.
What's confusing me is that my M/C is a much simpler design than the one show in the parts book.
The internal diameter of mine is 1 inch. The hole at the back end (opposite end to the pushrod) is concentric to be bore: I've seen a lot of photos of M/Cs that have an offset outlet there. I'm sure it was working on the car, there was still fluid right through the system.
Any thoughts and advice welcomed.