help identify engine part

[57raceman]

I was in the process of taking my 1993 metro engine (3 cylinder) apart for rebuild and a piece fell out of the engine and I have no idea where it came from or what it is? It is about the size of a pencil eraser and apears to be made of brass. It has a slot in it and I can see a small ball bearing inside (check ball?). Thanks for any help in advance!!

Steve

[Crvett69]

goesin front of block in the oil passage to the head, its a restictor, it just sits in the hole, if you turn engine upside down with head off will fall out

[57raceman]

Thank you for the quick reply!! Does it go in the hole with the slot facing the cylinder head or does the slot face the base pan? Thanks again!!!

Steve