I have a 22" Murray lawnmower, the deck bolts broke away from the holes so I trashed the old deck and found another 22" Murray lawnmower with a faulty engine. I swapped out the engines, and ONLY the engines. Nothing else was added from the old mower. Both have the same size engine, 4.5 hp Tecumseh. It seems the vertical shaft on my transplanted engine is longer than the faulty engines causing the blade to beat the crap outta the deck. It is only hitting the very bottom of the deck, the area that curves back inside towards the blade. Any ideas here? Can I shave or file down the blade some? It seems that it is just a hair to long and it is not sitting lower than the lowest part of the deck. Annnnnnnnd GO! :)