Usually, these type engines ( in motorcycle applications) had two tanks above the engine: one for fuel, the other for oil.
Both fed their respective systems by gravity. The earliest versions were "total-loss" systems, where the oil flowed down to its respective points, then was cast-out on the ground.
In the case of scavenging / re-circulating systems, a small pump scavenged oil from the bottom of the sump, and returned it to the top of the oil tank, where the oil waited to make another lap through the system.
The pictures I've seen of D-model tractors show two filler-caps in the hood, which supports the two-tank theory.
I would NOT try to operate one of these engines as a "closed loop", the way I think I see it plumbed in the picture. Rather, I would set-up some sort of small tank ( say a 1-qt tank, borrowed from an old Lawn-Boy, Clinton, or Briggs, with the largest size feed-line that will connect to the crankcase fittings, and the return line into the top of the tank ( through the filler ). The return to the tank helps to cool the oil, was well as supplying a slight-bit of "head pressure" due to the elevation.
I think you are right to be cautious before firing this beast up... :fing32:
If someone on the forum knows more about these early engines, hopefully they will speak-up... :howdy:
Both fed their respective systems by gravity. The earliest versions were "total-loss" systems, where the oil flowed down to its respective points, then was cast-out on the ground.
In the case of scavenging / re-circulating systems, a small pump scavenged oil from the bottom of the sump, and returned it to the top of the oil tank, where the oil waited to make another lap through the system.
The pictures I've seen of D-model tractors show two filler-caps in the hood, which supports the two-tank theory.
I would NOT try to operate one of these engines as a "closed loop", the way I think I see it plumbed in the picture. Rather, I would set-up some sort of small tank ( say a 1-qt tank, borrowed from an old Lawn-Boy, Clinton, or Briggs, with the largest size feed-line that will connect to the crankcase fittings, and the return line into the top of the tank ( through the filler ). The return to the tank helps to cool the oil, was well as supplying a slight-bit of "head pressure" due to the elevation.
I think you are right to be cautious before firing this beast up... :fing32:
If someone on the forum knows more about these early engines, hopefully they will speak-up... :howdy:
