Here’s a tractor that I dust off and get out of the barn on occasion. I thought in the spirit of this thread I’d do a little write up and give a tour of it. I know the pictures won’t do the size and scale justice and I’ll babble on too much - but hopefully you will stick with it and appreciate the mechanical ingenuity implemented in a survivor of 3 or 4 generations now.
This is a 1922 Model H 16-30 Rumely Oil-Pull tractor. It is a standard (non-adjustable) tread tractor produced for wheat land applications by the Advance Rumely Thresher Company of La Porte, IN. Its horizontal two-cylinder engine produces 16hp at the drawbar and 30hp on the belt at the whooping rated speed of 500 RPM. This tractor weighs 10,000 pounds and crawls across the ground at about 2 mph in high gear.
The Oil-Pull gets its name because it oil-cooled rather than water-cooled. The smokestack in the front is actually a large radiator with thin oil filled sheets that run vertically. Cool air is drawn up through the bottom using another unique feature of the Oil Pull. Rather than having a fan the tractor has an exhaust diffuser above the radiator and the exhaust leaving the narrow cone pulls cool air up from underneath the cooling sheets. As the load increases, so does the force of the exhaust and ultimately, the airflow. An engine driven pump circulates the cooling oil through the engine.
To keep operation and maintenance simple the Oil-Pull used a ‘flow through’ oiling system. Clean oil was added to the oilers in the top. As that ran through the engine it kept the crankcase full. The engine crankcase was open to the transmission at a pre-set level and extra engine oil ran down into the transmission. When the transmission was overflowing it ran oil into the final drives… and the excess oil from there ran out onto the very ground that it all came from to begin with. Oil change? Ain’t nobody got time for that.
Starting the engine begins with priming the cylinders using a hand fuel pump and setting the needle valve on the carburetor. Then the work starts. There is a handle to pull on that fits into notches on the inside of the flywheel. But pulling on it is backbreaking so there is a second method – namely putting your foot on a flywheel spoke and grabbing the top of the flywheel with your hands, THEN pushing for all your worth. The pistons are the size of 5 gallon buckets, so it isn’t a job for the faint of heart. I’ll post a link to a startup video as soon as it loads.
I traded a friend 3 other tractors to get this one. When I got it the engine ran, but slobbered more oil than Spindletop. My Dad and I overhauled the engine and as you can imagine, you DON’T go down to the Rumely dealer for parts. The cylinders were horribly pitted. I took the block to a machine shop and had the pistons turned until they cleaned up. Then they bored and sleeved the cylinders, then rebored them to match the pistons - so, ya, it’s non-standard now! But to keep in the ‘non-standard’ vein I had the crank journals cleaned up and new babbit poured in the bearings. Then we got real good with brash shims and Platigauge. Currently Centerpole Jr. says he wants to take the next step as an Ag-Mechanics project when he’s in high school. We’ll see. He’s still young enough that tractors and cattle rank above young ladies… but I suspect there are cuter things on his horizon than a 90-year-old relic.
This is the only piece of safety equipment on the whole tractor. A shield that pushes your foot out if it was to slip and get inside the flywheel during startup.
A couple other pictures from around the tractor - American-Bosch DU2 Magneto.
Dome lamp.
Dude. I hope that came through for you by now… (this is a gear used to move the front axle off to the side so that the right front wheel would not interfere with belt operation when the tractor was used as a stationary engine on a thresher)
Here are a couple cool pictures from the interwebz…
Lots of prairie about to get laid to waste.
The grand-daddy Rumely, 30-60 Model E.
tl;dr – IF you want stuff to last 90 years – use a LOT of iron.