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It is from a Minnepolis Moline model Z, a very early Z late 1930's.
This motor has 2 main bearings on the crankshaft. One at the front and one at the back.
The rocker arms are about 12-15 inchs long.
There is no thermostat
The fuel from carberator to intake vales travels in several truns and quite a length
the valves are positionned horizontally.
Wonder how this thing was able to stand up through the years.
each piston had a different severity of corosion, 2 weren't stuck 1 came out with oil/diesel the other one though we had to take brake fluid and light it on fire, which is the most drastic course we ever take.
The prob with this motor is that you could not hit the pistons with a wood block and a hammer, unlike every other motor on this world. This motor you took off the plate that holds the sparks plugs then you had a 90 degree turn to the top of the piston.
I use to own a 1951 28' Monk Classic. She was powered by an 1950 Atomic Four. Four Cylinder, top speed of my boat was 8 knots. But man that engine was super LOUD.
Here is a picture of an Atomic four on a Dyno. Dunno the year.
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