Question about Briggs & Stratton Garden
You are on the right track. They use aluminum so that any sudden stop to the crankshaft allows for that little bit of give after the sudden stop to allow engine parts time to slow down. A complete sudden stop could mess up the rods, valves, and possibly the crank itself because of inertia. A steel key wouldn't shear or "break" as easily and would allow for a complete sudden stop. All the engine parts (due to inertia or stored energy) do not easily immediately stop. The aluminum key shears and has a braking effect on the inertia driven engine allowing it to slow down further. Install a new aluminum one (very cheap) and your timing issue there is solved. The replacement key is a very normal, standard Briggs part. They usually shear on a lawnmower when the blade hits an immovable object. I don't know if your machine hit anything. but now you know.
Posted on Mar 31, 2011
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Posted on Jan 02, 2017
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