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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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