The reason tractors of that era had 2 check plugs for checking the oil was because the majority of tractors of that era were designed to burn distillate or kerosene. Neither distillate or kersene burns away cleanly and the leftover byproduct ends up contaminating the engine oil. Standard practice of that time was for every so many hours of burning distallate or kersene was to let the tractor sit overnight which allowed the oil to settle to the bottom and the lighter distillate/Kersene contaminates to rise to the top. Pull the bottom check plug to drain the contaminates off which had risen to the top. Then top off with one new quart of oil. This was much cheaper than full oil changes for depression era farmers.
Gasoline tractors shared the same factory tooling even though this unique feature is not needed on them since gasoline burns away cleanly in comparison to distillate or Kersene.
IH, Case, and JD all used similar check plugs for this reason on their multiple fuel models. Once gasoline became the primary fuel in the early to mid 1950's then you see the addition of the dipstick as by the mid 1950's tractors were either gasoline or diesel (distallate and kersosene were pretty much obsolete by then or sold in such small numbers to no longer be relevant).
This post was edited by rankrank1 at 18:54:38 02/04/12 3 times.
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