Cummins engine auto parts VSDL0237 bushing P3904166

Built as a critical buffer component between the piston pin and connecting rod, this bushing adopts a high-performance composite structure. The base layer is made of high-strength bronze (CuSn10Pb10) with a tensile strength of 350MPa, providing structural stability. The inner surface is bonded with a 0.1mm-thick PTFE (polytetrafluoroethylene) composite coating, reinforced with carbon fiber to reduce friction coefficient by 40% (to 0.05) and enhance wear resistance. This dual-material design combines the bronze’s rigidity with the PTFE’s self-lubricating property, eliminating the need for additional lubrication and ensuring smooth movement even under boundary lubrication conditions—extending service life to ≥200,000km

Engineered to facilitate stable load transmission between the piston and connecting rod, the bushing undergoes ultra-precision machining. The inner bore is honed to a surface roughness of Ra ≤0.2μm and a roundness error of ≤0.005mm, ensuring uniform contact with the piston pin and minimizing stress concentration. The outer diameter features a slight interference fit (0.01-0.03mm) with the connecting rod bore, preventing bushing rotation during engine operation (up to 2800rpm for B-Series engines). The flange end face is lapped to a flatness of ≤0.01mm, limiting axial movement of the piston pin and avoiding abnormal wear of the connecting rod small end

Optimized to endure the harsh conditions of engine compartments, the bushing exhibits exceptional temperature and corrosion resistance. The bronze base layer maintains structural integrity at continuous operating temperatures up to 150℃ (short-term tolerance of 180℃), adapting to the high heat generated by the piston assembly. The PTFE coating remains stable at -40℃ to 260℃, ensuring reliable performance in extreme cold or overheating scenarios. The bushing undergoes a phosphating treatment on the outer surface, forming a protective oxide layer that resists corrosion from engine oil contaminants and moisture—passing 1000-hour neutral salt spray testing (ASTM B117) with no significant degradation

The bushing is designed for efficient installation and long-term cost savings for repair shops and fleet operators. Its precision dimensions allow for press-fit installation using standard tools (no specialized equipment required), reducing installation time by 50%—a single technician can replace a set of 6 bushings in 2 hours. The self-lubricating PTFE coating minimizes wear on the piston pin and connecting rod, extending the service life of these expensive components (saving up to $800 per engine overhaul). As a genuine Cummins part, it eliminates the risk of premature failure from mismatched aftermarket bushings, which often cause connecting rod damage (repair costs up to $2,000). Backed by a 1-year/150,000km warranty, it provides reliable support for medium-duty engine operations