Sounds like an oil pump to me.
Rebuilding a rebuild is not one of my favorite pastimes. Sometimes like launching a kite with a boat anchor attached.

Want to see this engine repaired and purring. Good luck!

snapped_bolt

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'81 240D For now, a good place to borrow new parts
'80 300TD Probably will be put back into service!
'79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....