Honda Passport Crankshaft converts the straight up and down motion of the pistons into smooth and spinning power that drives the transmission and finally the wheels. Built to fit deep inside the engine block, this important shaft bears offset crank throws to which connecting rods latch on, allowing motion to change direction each time fuel ignites. Early and lower output versions in the Passport applied durable cast iron, while models tuned for greater horsepower are cast from tougher forged steel, the difference being in strength with forged pieces handling heavier loads without flexing. Later generations of Honda Passport continued to refine the Crankshaft, and Honda opted for profiles that offer rigidity coupled with smoother idle with every edition of the Passport. Regardless of material, all Crankshaft is machined with precision journals that ride on bearings, and clean oil flow keeps these surfaces slippery. If oil becomes too thin or dirt gets in, journals can score, clearances increase, and a knocking sound signals that damage is occurring. Because the part is bulky and heavy, replacing a failed Crankshaft requires removal of the engine, bearing cap sequencing, careful torque and alignment, a challenge to even the experienced do-it-yourselfers. Still, with regular oil changes and a closed environment, the factory unit should last the life of a Honda engine, and every Passport should cruise without vibration. Owners who feel odd shudders should shut down quickly, preventing small grit from turning a still healthy Crankshaft into scrap.
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