The Crankshaft of the Jeep Grand Cherokee transforms a piston's up-and-down thrust into smooth rotary power to keep the drivetrain gears and wheels turning. The Crankshaft contains offset crank throws to which the connecting rods are attached, spinning inside the engine block and converting every combustion stroke into a rotation. Since the launch of the Grand Cherokee, every model has relied upon it. Engines produced by Jeep over the years have employed two main Crankshaft configurations. The durable cast iron Crankshaft is for everyday power outputs. Conversely, the forged steel Crankshaft is for high horsepower demands. The latter design is far better at shrugging off flex and fatigue when the cylinders hit hard. Both designs are precision balanced and, with clean oil, should last as long as the Jeep itself. Insufficient lubrication allows grit to wear down journals, loosen clearances, and cause the knock or shudder warning the driver that the Grand Cherokee requires servicing. In the event of failure, swapping the Crankshaft is carried out by lifting the engine, removing bearing caps sequentially, applying grease to new journals, appropriately torquing the caps, and reinstalling everything to get the Jeep Grand Cherokee cruising smoothly again.
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