A connecting rod is an engine component that transfers motion from the piston to the crankshaft.
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Connecting rods are commonly made from cast aluminum alloy. As a result, are designed to withstand dynamic stresses from combustion and piston movement. The small end of the connecting rod connects to the piston with a piston pin.
So, The piston pin, or wrist pin, provides a pivot point between the piston and connecting rods. Spring clips, or piston pin locks, are used to hold the piston pin in place. They can also be a press fit in the rod as well.
The big end of the connecting rod connects to the crankpin journal to provide a pivot point on the crankshaft. Connecting rods are produces as one piece or two-piece components. A rod cap is the removable section of a two-piece connecting rod. As a result, The rod cap is attached to the connecting rod with two cap screws for installation and removal from the crankshaft.