Referring to #9 and #10 in this link:
http://www.realoem.com/bmw/enUS/show...diagId=11_6099 The check valve is lowermost, then there's the rubber spacer sleeve above it. I'm wondering how high above the surface of the block the spacer should protrude? Should it be making contact with the head gasket? And should it be replaced? My spacer is sitting flush with the block, see the picture below.