Well, actually there is a specificaton for those valve springs, if only we knew how to look it up now. And had the equipment to test them.
For the Small Block Chevy back in its day and depending on which spring on which head it was measured as a certain pressure at a certain length. I remember checking the valve springs on an engine I built in the Auto Mechanics shop at the technical college.
The tester used a beam type torque wrench for leverage and there was a chart that converted the pounds of pressure exerted by the spring at the specified length of spring.
For you, I don't know of any way to test the springs on the tractor. I have heard of forcing a wedge or spacer under a questionable spring to see if it helped the valve function on that particular cylinder.
I recall one of the last tractor engines I built, with all the springs on a table side by side you could see 4 or so that weren't as tall as the others. I replaced them.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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