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Duramax Keyed Crankshaft
To rule out the possibility of the factory crank dowel pin shearing off, the crankshaft was cut for a keyway and fitted with a steel bar (known as “keying the crankshaft”). This is common practice for any Duramax build, as the 5mm dowel pin that holds the oil pump and balancer in place is known to shear off the snout of the crankshaft in heavy duty applications. Once this failure occurs the engine self destructs in short order, so “keying the crankshaft” is the ultimate insurance policy to have the crankshaft keyed.