I would start by checking the out flow of the pump. Into a can or a clear line on the pump. Watch it while running. Those vacuum pumps tend to fail after a few years. Lets air into the system.
Check the valve settings cold page 2-1.
This is the hard one. Rotate the engine until the valve is off the seat.See if the seat shows any signs of being loose.
Check the intake manifold for leaks. This was a known problem on some units. Not sealed properly at the factory. Some units took years to show up.
What brand of spark plugs.
I will check my notes. For any odd problems I ran into over the years.
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Today's Featured Article - A Collection of Farmall Stories - by Various Authors. We receive quite a few short stories from our readers, and we appreciate every one. Presented here is a collection of two Farmall tractor stories for your enjoyment. [Editor] Memories of Dad's Farmall A J.Brandt My father first started farming with a Farmall A that he purchased in 1940. It was used on a large grain farm in North Dakota where I still live close to but do not farm. There are many memories of this tractor mowing hay and cultiv
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