2014 - Volume #38, Issue #3, Page #37
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Answers To Reader's Problem Keeping Ford 642 Tractor Running When Hot
L. Richard DeBoer, Mansfield Center, Conn.: “In regard to Bill Mitchell, Tuscumbia, Ala., in your last issue (Vol. 38, No. 2), who was having trouble keeping his Ford 642 tractor running after it gets hot, I have an engine in a Deere lawn tractor that did the same thing. The exhaust valve would stick when warmed up. I reamed out the guide and solved the problem. Still using it today with no problem.”Ron Zeigler, Boonville, N.Y.: Here’s another take on what might be happening with Bill Mitchell’s Ford tractor. “We had a Ford tractor engine that did the same thing. Our local tractor repairman told us to drain the gas tank and take the fuel valve out of the bottom of the tank. Sure enough, the screen on the valve was plugged. After cleaning it we had no more problems. Apparently what was happening is that small particles of rust would gather around the screen from the vacuum pressure and eventually plug it, stalling the engine. Once the engine stalled it would lose its vacuum and some of the rust would release so the tractor would start again.”
Jim Whittenbarger, Cincinnati, Ohio: “In my judgement, Bill Mitchell of Alabama has a burned out or sticking valve. A compression test, with a low reading, will confirm the problem.”
Phillip Belcher, Weaubleau, Mo.: “In regard to Mr. Mitchell’s problem with his Ford 642, I have a 861 Ford that had the same problem when I bought it used. I solved the problem by making sure the fuel tank is sealed properly. The cap on my fuel tank had a hole in it and that allowed heated gasoline vapors to escape. I plugged the hole and that fixed the problem.”
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