Question for 914/6 oil tank/oil change, Does it need a supplemental way to drain? Options

[Krieger]

I have seen some of the members here adding ways to drain the oil tank. 911s have a tank drain, but their tanks are mounted fairly low in relation to the engine. The bottom of the 6 tank is close to being near the same height as the top of the engine caes. Won't the oil just run into the engine case?

[ArtechnikA]

because there are two separate oil systems in a 911 engine - scavenge and pressure.

The line from the cooler to the tank is the scavenge line, and it dumps to the _top_ of the tank (it's the return line).

The pressure inlet line - from the _bottom_ of the tank to the pump - is the one you have to open to drain the tank.

[J P Stein]

because there are two separate oil systems in a 911 engine - scavenge and pressure.

The line from the cooler to the tank is the scavenge line, and it dumps to the _top_ of the tank (it's the return line).

The pressure inlet line - from the _bottom_ of the tank to the pump - is the one you have to open to drain the tank.

The scavenge line feeds into the lower part of the oil tank. (see pic) Internal passages feed it thru the filter then into the tank.....it also feeds the opposite way to the sump if left to sit for a week or 2.

Many feed lines ...tank the below oil cooler....have a steel joint that can be cracked to drain the tank if necessary. You wouldn't want to use an aluminum fitting here as they will wear out if disconnected repeatedly.