I broke the timing chain on my 92 e36 and bent the valves. I am finishing up the reassembly and have an extra part that I now believe goes somewhere on the head (hopefully not under the head).

It is a all metal threaded check valve with an oring at the base that is approximately 1/2 in in diameter and 1 inch tall. It seems like something that would have been installed in the head. The machine shop gave it back to me with some other parts after they rebuilt the head. It needed the new oring from the gasket set before installation and I forgot about it until now (after all has been assembled).

Anyone know where this check valve goes before I start to disassemble again?

Thanks Jamie