Chris: Your biggest danger if tractor sits outside in the rain, about half the water that hits the hood follows right down the pipe and into the engine. Probably 100 times as much water as if you had a tight mufler and pipe with nothing over it. It's all about square inches of rain collected. If you have to leave it out in the rain, pull the mufler and pipe, and put a can over the manifold.
I once had a Farmall 300 with pipe and manifold threads bad. In a 4" rainfall the hood collected enough water to fill a cylinder, plus the manifold. With a tight exhaust I've seen the 300 sit in an open field with nothing over the exhaust, and next to no water went in.
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Today's Featured Article - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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