First off go ahead and just tighten the manifold and see what happens. Second, lok at the wide part of the manifold that lets heat surround the intake side. Find what looks like a tiny hole and make sure it isn't plugged up with rust. A bit of baling wire works geat to poke around in there with. The frost is from the fuel vaporizing at the venturi and when liquids evaporate they loose heat hence the freezing. the little hole does 2 things. It give a place for water to drain out should any get in the exhaust pipe and second it lets some exhaust heat flow down and wrap around the intake heating the mixture up so it vaporises properly. Do one of those things at a time and let us know what works.
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Today's Featured Article - Tractor Proflie: John Deere Model R - by Staff. The John Deere Model R, the last of the lettered tractors, was the first diesel-powered tractor produced by John Deere with a gasoline starting engine. It was also the first tractor they produced that had an optional steel cab. The photo above shows the tractor w
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