Had a young mechanic doing a valve job on a 560 gas one time. He drove out the guides and mushroomed the driver so it made some of the bores in head larger. We reamed it out and found larger O.D. guides and put them in. Often wondered what the next guy would think when he came across this head. Far as valve seals, I am a real believer in them even on these old engines. What happens is as the rocker arm bushing and shaft wear a lot more oil is thrown on the valves and there fore you can get that smoking situation when you first start up. May not change overall oil consumption or then again it may. IH had two suppliers of rocker arms for the 4 and 560 gas engines.. The companny all of a sudden had some realy smokers , oil burners. Co. found out that one supplier was not pinching the oil groove on top of rocker arm down so valves were flooded with oil. Amazing how much oil can go through a guide even when they are new. Had to pull head to clean up all the carbon, If I remember correctly, I pinched the oil groove to specs, installed perfect circle valve seals and that tractor was fine for many, many years.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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