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Bored&Stroked · 11-08-2020, 10:19 AM

The WWII industrial 1942 Merc style engines had multiple styles of oil flow "redirection" plugs.

Here is one that came out of one of my engines - it uses a thin steel sleeve/pipe that is soldered into the brass fitting. The pipe diameter (ID) is just over 5/16" - a 3/8" bolt will not slide into it. The brass fitting used what appears to be 3/8" style AN compression fittings and I'm sure steel lines (which I don't have).

IMG_8782.jpg

I'm running a 100% full-flow system with a modified pump (oil line comes out the side of the pan, nothing through the pump body). I modified the horizontal outlet hole for 3/8" NPT and bored/drilled the oil passage behind it out a couple drill sizes. I don't remember how big I went, but it was probably about a 3/8" or so hole in the end.

11-08-2020, 10:19 AM	#24
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,093	Re: Remote oil filter fitting re size The WWII industrial 1942 Merc style engines had multiple styles of oil flow "redirection" plugs. Here is one that came out of one of my engines - it uses a thin steel sleeve/pipe that is soldered into the brass fitting. The pipe diameter (ID) is just over 5/16" - a 3/8" bolt will not slide into it. The brass fitting used what appears to be 3/8" style AN compression fittings and I'm sure steel lines (which I don't have). IMG_8782.jpg I'm running a 100% full-flow system with a modified pump (oil line comes out the side of the pan, nothing through the pump body). I modified the horizontal outlet hole for 3/8" NPT and bored/drilled the oil passage behind it out a couple drill sizes. I don't remember how big I went, but it was probably about a 3/8" or so hole in the end.