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 - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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