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Joe K · 06-08-2013, 12:45 PM

It may not matter. IIRC, the tube is "open" at the top to the scupper built into the lower bearing cap. Oil returning to the crankcase simply follows the tube down and prevents oil curling over the top of the scupper and following the inboard end of the cap to the square gasket and possible leak path past the square gasket to the outside.

The tube/scupper arrangement simply prevents a continual flow of oil over the square gasket which ain't all that great a seal in the first place relying on the knife edge of the oil pan for seal.

Joe K

06-08-2013, 12:45 PM	#2
Joe K Senior Member Join Date: Jul 2010 Location: Cow Hampshire Posts: 4,188	Re: Rear Main Cap Oil Drain Pipe Dimensions It may not matter. IIRC, the tube is "open" at the top to the scupper built into the lower bearing cap. Oil returning to the crankcase simply follows the tube down and prevents oil curling over the top of the scupper and following the inboard end of the cap to the square gasket and possible leak path past the square gasket to the outside. The tube/scupper arrangement simply prevents a continual flow of oil over the square gasket which ain't all that great a seal in the first place relying on the knife edge of the oil pan for seal. Joe K __________________ Shudda kept the horse.