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The connecting rod links the piston to the crankshaft, transmitting the force from the expanding gases in the cylinder to the crankshaft, thereby converting the piston's linear motion into rotational motion.

Connecting rods are typically made from materials such as carbon steel, micro-alloyed steel, or spheroidized graphite cast iron. In high-performance applications, materials aluminum alloy and titanium are used for their strength and lightweight properties.

Connecting rod failures can result from tensile failure due to high engine speeds, impact forces from piston-valve collisions (often due to valvetrain issues), rod bearing failures (commonly from lubrication problems), or incorrect installation.

Repairing a damaged connecting rod is generally not recommended due to the critical stresses it endures. Replacement is typically the safest and most reliable option to ensure engine integrity.