Posted by M Diesel on May 12, 2010 at 13:41:44 from (12.24.61.12):
In Reply to: Farmall WD-40? posted by Marty from MN on May 11, 2010 at 19:03:12:
Thanks for that WD-40 ad sheet. Cool to have.
Yeah the TD 40 cylinder setup was migrated to the TD18 and then to the TD14. 461 cubes for 4 cylinders, 691 for 6. Pretty much no other parts change.
Bob M, the 335 is the 9 setup you're thinking of.
WD-40 is actually a pretty stout horse. Essentially a 4 or 5 or even 6 bottom tractor depending. It had to compete well with steam engines to be successful, and had to run on what could be poor fuel and do it fairly efficiently. No easy task in those days. Steamers pulled more bottoms, but most didn't actually plow that deep either. Machines like the WD-40 went a bit faster and didn't need all that support to keep it fed. Running a steamer is a 2 to 4 man operation, so a fuel tractor compares well in cost per acre. The oil pulls were too similar to the steamers in many ways. Size, cost and slow gearing worked against them in the end. That's why a WD-40 was considered nimble for a workhorse. It was all part of the tractor downsizing that was going on.
FYI, the auto switch over is a little gear box that counts off roughly 800 revs and switches. Problem is, when the engine is warm you don't really need that much time and they suck that gas tank dry pretty quick. On the plus side they will idle on well less than a gallon an hour, so most weren't shut down much.
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