Mystery Piece

RattyBarracuda said
Was replacing the roller lifters on my 1988 318. Found the pictured piece on my tray when I was cleaning pushrods, rockers, and rock shafts.

No idea what it is. Not even sure if it came out of the engine.

Any thoughts on it welcome.

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The pictured item is the inner moving metal valve part of a PCV (positive crankcase ventilation) valve.

The valve part is shown in pink in the following generic diagram:
Screenshot 2025-11-02 10.54.58 AM.png