[V8COOPMAN]

Originally Posted by busmania

Yep, if it’s supposed to be there I prefer it to be there! Anyone got the tube for sale?

BELOW is an explanation (in someone else's words) of why that tube was originally necessary, as well as WHY IT IS NO LONGER NEEDED.

"The very early engines 32-34, had no crank case ventilation, and slinger rear main. Crank case windage presurizes the interior of the engine, which looks for a place to escape. Major escape route is through the labyrinth, so a return pipe was fitted, the open end of which is immersed in the oil in the pan. Therefore, that possible/probable/definite oil leak is eliminated [to a degree]
Beginning 1935, and all subsequent production, the crankcase has positive ventilation, therefore there is no presurization of crankcase, which precludes the blowing out of oil through the labyrinth, therefore, although the rear main cap was tapped for the fitting of the return pipe, the pipe was not fitted during production.
Certain 'dump truck' applications, whereby a heavy load could lift the front wheels off of the deck, could indeed, tilt the rear of the engine sufficiently to allow oil to leak out through the labyrinth, so in that application, the return pipe was fitted."


To satisfy your curiosity, BELOW is a picture of the tube in question.

Coop