Deere's recommended procedure for setting valve clearances when there is a chance of wear in the system, given in the owner's manuals, shop manuals, and Field Service Bulletins, is to turn the adjusting screw until a slight drag is felt when the push rod is rotated, then turn the adjusting screw out 1/3 turn which will provide 0.020 clearance. There are normally hex nuts involved, so 1/3 turn is two hex points. This process covers all wear in the tappet levers, tappet rod, cam gear wear, etc.. Using a feeler gauge can be particular problematic if the tappet levers have not been ground and have worn grooves in the heads - and this groove is masked by too wide a feeler gauge. This method is easy to do, and accomodates all wear in the system. Works fine for me.
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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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