How is the wrist pin secured in a small engine?

The wrist pin in a small engine is secured either by a retention method involving pressing it into the connecting rod or using a retaining clip. This design allows the wrist pin to fit snugly within the connecting rod, enabling it to pivot smoothly during the engine's operation. The retaining clips serve as a secondary method to ensure that the wrist pin does not come loose while in use, providing additional security and maintaining the correct alignment of the piston with the connecting rod.

This method of securing the wrist pin is crucial for allowing the piston to move efficiently within the cylinder while handling the stresses of combustion and movement. The pressing and retaining clip method is a well-established practice in engine design due to its reliability and effectiveness in maintaining the mechanical integrity of the engine’s components.