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Also due problems the flywheel/crankshaft design of OP's 331877-2371-G5 111031ZD engine PN 796335 steel key needs to be installed and the retaining bolt or nut torqued to 110 ft-lbs. This is per Briggs APSI 82. Briggs later change the flywheel and crankshaft on July 1, 2012 and started using a double length steel key.(so reference in APSI 89).