All gasoline engines have a system to relieve pressure and fumes in the crankcase/cylinder head area. This (in old engines) was a road draft tube with a liquid vapor separator at the top of it. This allows combustion gasses, condensation, and oil vapors to be expelled down and out. Some manufacturers used a passive system to draw combustion gasses into the air cleaner (after the cleaners filter so combustion gasses were directed into the intake. The use of Positive Crankcase Ventilation (PCV) was introduced as early as the 1950s but was uncommon until environmental laws required combustion bypass gasses to be burnt. I am sure that the tractor has one of these systems, probably either a road draft type or a Passive air intake device/connection. Jim
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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