Another cause of a sheared key on a lawnmower is a loose blade. The blade may hammer back and forth and eventually cause the key to shear. The same effect can occur on any engine when the load, or the drive train between the load and the crankshaft, bucks, skips, or otherwise varies violently.Click to see full answer. Simply so, why does the flywheel key keeps shearing?Another cause of a sheared key on a lawnmower is a loose blade. The blade may hammer back and forth and eventually cause the key to shear. The same effect can occur on any engine when the load, or the drive train between the load and the crankshaft, bucks, skips, or otherwise varies violently.Additionally, what are flywheel keys made of? the flywheel keys specifically made for OPE engines such as B&S, etc. are made of soft metal alloy called “potmetal”. One may also ask, what does a flywheel key look like? The flywheel key is a rectangular metal peg that keeps the crankshaft and flywheel aligned when you tighten the flywheel nut. If the mower blade hits an object with enough force to knock the flywheel out of alignment, the flywheel key breaks, protecting expensive parts such as the crankshaft from damage.How do I install a Woodruff key?However, they are difficult to install. The key is first pressed into a curved slot milled in the shaft and then aligned so that its flat top is parallel with the shaft. But as the shaft and Woodruff key are pressed into the component, the key tends to slip out of position.
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