Description

The Cummins Piston Pin 3901173 is a precision-machined diesel engine wrist pin designed to provide secure articulation between the piston and connecting rod while maintaining OEM-level strength and durability. This component plays a critical role in transferring combustion forces smoothly and reliably during engine operation. Manufactured from hardened, high-strength alloy steel , the 3901173 piston pin is engineered to withstand extreme combustion loads, high rotational speeds, and continuous heavy-duty service typical of Cummins diesel engines. The precision-ground surface finish promotes smooth movement within the piston and connecting rod bushing, reducing friction, wear, and the risk of galling. Designed for accurate fitment and proper load distribution , this piston pin helps maintain correct piston alignment, minimizes internal stress, and supports long-term engine reliability. Replacing piston pins during an engine rebuild is strongly recommended to ensure quiet operation, consistent performance, and extended service life. This piston pin is commonly used in Cummins diesel engine rebuild and overhaul applications , including on-highway trucks, industrial engines, and heavy-duty equipment where dependable internal engine components are required.