Direction of engine oil flow

[Fieldcoordinator]

I'm in the process of acquiring a m35a2 and would like to install an aux electric oil pump to provide pre-start/post shutdown oil pressure. Looking at the systems on the market, they take oil from the pan and pump it back into the engine via a tee at the oil pressure switch.

The question is - is the oil pressure switch tapped into the galleries before or after the oil filters. I wouldn't want to pump unfiltered sump oil straight into the engine and turbo oil galleries and defeat the purpose of the aux pump.

 

[dmetalmiki]

Some of my vehicles use a fitting drilled sump for fitting at the rear of the sump. . ( removed sump) from there to the pump (ex fork truck lift pump) then up to the gallery plug BETWEEN and slightly under the oil filters. pressure switch not affected.

My other trucks use the Oil Drain plug. then similar piping.

other two use the sump plug. then to pump. then to a fitting DRILLED and FITTED into the side of the oil filter can.

All work fine.
http://youtu.be/9Gt6Y873VMg

 

[Warthog]

Here is a useful manual. It is for the LDS motor and not the LDT that most Deuces have. The engines are very simular.

Figure #2 has the oil path.