I fixed the lead today seeing it was in my hand.

With reference to the reed valve type breathers, I used to work in refrigeration for quite a while and in the compressors they used reed valves, which I are a piece of thin spring steel.
They are pictured above in post #58348.
I will take a close up tomorrow.

This V40 engine wasn't turning over nicely, it wasn't seized but had some resistance, so I pulled it all down to find presence of water. Not major, intake valve shaft small signs of rust. Piston and rings were choked with brown rusty liquid.

Engine was low on oil, thought the bottom seal was leaking, turned out the sump plug had a slow leak.

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Happy is he who penetrates the mystery of things.