P circle seals have a teflon ring riding on the stem, and it is free to move within a small chamber in the rubber part of the seal. this short stroking action meters oil into the guide. They can be put on almost any engine. The ones with cast in place valve guide bosses must be machined to take the rubber part of the seal. Most with pressed in guides do not need any machining. JimN
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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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