'36 rear main cap

Zimmco

Zimmco

Senior Member
What is the reason that the drain hole on the forward edge of the rear main cap is threaded? Somehow I think this is for a check valve used on some trucks, but am curious why Henry did this on all engines. Is there something else that's supposed to thread in there?

Al
 
Here is a pic of the tube. Ed
 

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since there is no "seal", just a slinger if there wasn't a tube down into the oil blowby would come out the rear main and get oily vapors into the clutch --- it works like the trap under a sink --oil goes down, vapors don't come back up
 
For 36 the oil return pipe is longer and may be smaller in diameter that the one shown for the 38 and up engine. Ford would remove the tube when changing oil pumps from the early style to the newer later style due to interference with the pump and did not even install the pipe in some later years. By 38 Ford decided to install them once again. If you find the correct one make sure it does not screw into the cap too far and block the oil return (groves in the bearing) or even touch the crank.
 
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