Posted by Indiana Ken on February 22, 2016 at 18:30:52 from (66.249.235.138):
In Reply to: Re-Torquing head bolts posted by JRSutton on February 22, 2016 at 07:05:18:
Quoting Removed, click Modern View to see
No need to imagine: The effect of temperature is small however, the Modulus of Elasticity, denoted as "E", does decrease with temperature increases. For steel the effect would be an approximate 1.6% reduction, going from 100 degrees F to 300 degrees F. That means to maintain the same clamping load at 300 degrees the bolt would need to be stretched an additional 1.6%. At 1000 degrees you would need to stretch the bolt an additional 18%.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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