Please see the attached picture of the oil filter housing openning on the crankcase of the 560.

What is that bolt/spring at the lower right arrow? What does it do?

I am working on the 420 but I do not see this bolt/spring. Don't the 420's have this? or mine is missing.

Thanks

Attached Thumbnails

 

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1991 420SEL Project Car (Completed and rides beautifully) http://www.peachparts.com/shopforum/showthread.php?t=112321
2000 BMW 740IL
2000 Integra Type R - Track Car - SOLD
2005 S2000 - Track Car
06 C230 Sport
89 560SL