Oil Tube to oilpan on om617
It is the oil return drain from the valve cover breather. It is there to recapture oil from excessive blow-by, the pressure was vented to the air cleaner, then the oil drains back to the pan.
take a piece of 1.250 black pipe nipple 4" long put a cap on 1 end drill a bunch of .250 holes in stuff it full of steel wool and on the bottom make a fitting that will fit into the return and on the side weld in a fitting that will adapt to the blow by tube should work
then it will drain back into pan
then it will drain back into pan
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