Just a neoprene rubber shield (umbrella) that fits on the valve stem and mostly covers the top of the guide. Sold by stem size mostly. Perfect Circle style are more complex and have a metering system, and a teflon bushing at the top. These clamp on the top ov the guides, and ride on the stem. They are designed to pass correct oil to lube the stem, and not so much as to allow sucking of oil. Even IH sells them ! But easily found in parts stores. for applications. The PC seals may need the machining of the valve guide outer diameter to allow installation, so the umbrella seals can be used W/O machining or head removal. They just prevent oil from running down the stem in mass quantities. JimN
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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