Caps are the most common cooling system failure. Look closely, there s a small mushroom like disk (atmospheric valve) on the bottom center, it should be held closed by a very light spring. Its rubber should be in good condition, as should the rubber that seals against the neck flange. The tension spring that applies pressure is also a failure point in that it can rust or corrode away. The atmospheric valve is to allow the cooling system to draw in air as it cools off, this prevents collapsed hoses or components like top tanks. New caps are cheap. Jim
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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