Heat checking is a surface issue that is not in the location this crack is located. Stress risers at the end of a crack is dramatic, and can cause catastrophic failure. The Iowa air crash (in the 1980s) was caused by such a crack. The fact that a keyway was abused in the process and difficulty putting it on the crank stub, puts expansive strain on the wheel. Not good at all. My grandfather was almost killed at a saw mill when the governor belt came off of the steam engine and it ran away exploding not only the saw blade (after spitting out the inserts at extreme velocity) but the flywheel as well. A student in my auto school lost both feet in a 57 Chevy when racing at a drag strip. The wheel took out the dash and windshield nearly cut the tin of the body in half and took both feet at the ankles. We are serious about safety and would not make the point as firmly if it were not an issue. Don't give grief about the low speed engine compared to a jet, every one was designed to be crack free at the expected speed and was not. Jim
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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