Posted by athol carr on July 11, 2019 at 01:56:24 from (122.58.103.8):
In Reply to: Tractor sighting posted by Centash on July 10, 2019 at 18:25:02:
That little tractor between the Massey-Harris and the propeller is definitely a 12 series McCormick-Deering, it has the later attached McCormick-Deering nameplate, the tank is 12 series but the wheels make it a W-12 (pneumatic tyres were an option) as the O-12 had pneumatic tyres, the Fairawy-12 had 8 inch wide steel wheels or pneumatic tyres, the I-12 had solid rubber front tyres or pneumatic tyres. Whether it is a W-12 or W-14 could only be determined by a closer look at the right-hand side of the engine, the W-12 had a engine vent as a pipe running diagonally down across the front of the engine whereas the W-14 had the vent on the side of the valve cover. An example of a 12 series is my 1937 (December 1936) O-12, OS-2346
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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