It is gapped between the valve stem and the rocker. You must follow the directions included, or they will be wildly out of adjustment. There are other rotation schemes that are just as good, but are not universal. A feeler gauge is a flat stainless or tool steel blade available at tool stores/NAPA etc. If the rockers are worn and show uneven wear on the tip, adjustment could be made with a dial indicator, or they could be resurfaced to smooth. This is how it is done. The feel of the gauge should be about like using your fingers to wipe cheese off of a knife blade, no more. Good luck. JimN
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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