They do two things. neither one of which makes a lot of difference to the engine on a tractor. The first is that they can either increase the spring pressure for higher RPM operation, or repair weak springs to Specific Compressed length pressure. The second is that they have small contact with the spring metal which (in theory) reduces heat flow into the spring. There is not much heat on the spring from either the valve stem (cooled by the guide), or the head, (cooled by water). Thus the oil is likely to be the hottest thing around the spring, and well withing the springs lower critical temperature (at which it will loose temper) Shimming weak springs is OK using good springs is better. Using heavier springs on a Farmall (not a Puller, just a working tractor) is a bad idea, they do not float valves! Cam wear and lifter wear will increase dramatically with heavy springs. Jim
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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