Dongfeng Renault engine parts Fuel injector connecting rod 1112BF11-020

Crafted from 40Cr alloy steel—a premium material for high-stress engine components—this connecting rod delivers exceptional tensile strength (900 MPa) and yield strength (750 MPa). The steel undergoes a quenching and tempering process that enhances its hardness (HRC 30–35) and impact resistance, allowing it to withstand the dynamic forces of engine operation (e.g., vibration, fuel pressure fluctuations up to 2,000 bar). Unlike standard carbon steel rods that bend or fatigue under stress, this alloy steel design maintains structural integrity even in high-performance or high-mileage Dongfeng Renault engines. Rigorous load testing confirms the rod endures 150,000+ engine cycles without deformation, ensuring reliable fuel delivery between the injector and rail

The connecting rod features precision-rolled threads with a class 6g tolerance (for external threads), engineered to maximize thread engagement with the fuel injector and rail. The threads are coated with a nickel-phosphorus layer that enhances lubricity during installation, preventing thread galling (metal-to-metal adhesion) and ensuring uniform torque application (18–22 N·m for injector end, 12–15 N·m for rail end). Additionally, each thread end includes a built-in O-ring groove that accommodates a Viton O-ring (heat-resistant to 200°C), creating a secondary seal against fuel leaks. Unlike rods with plain threads that rely solely on thread tightness, this dual-seal design eliminates fuel leakage—critical for maintaining the common rail system’s pressure and reducing emissions

Designed to withstand the harsh environment of Dongfeng Renault’s engine bay (exposure to fuel, oil, coolant, and high temperatures), the connecting rod features comprehensive protective treatments. The rod’s surface is coated with a zinc-nickel alloy layer (10μm thickness) that resists rust and corrosion, passing 1,000 hours of neutral salt spray testing without degradation. The O-rings are made of fluoroelastomer (FKM) that resists chemical degradation from diesel fuel additives and engine oils, ensuring long-term sealing performance. The rod also maintains stability in extreme temperatures (-40°C to 180°C), avoiding warping in high heat or brittleness in cold conditions. These features ensure the rod operates reliably for 80,000+ km, even in harsh operating environments

As a critical link in the fuel system, this connecting rod plays a key role in ensuring precise fuel delivery to the engine’s combustion chambers. Its rigid structure maintains a consistent fuel flow path between the fuel rail and injector, preventing pressure drops or flow fluctuations that cause incomplete combustion, reduced fuel efficiency, or increased emissions. Unlike flexible or low-quality rods that vibrate and disrupt fuel flow, this rigid alloy steel design ensures the injector receives a steady supply of fuel at the correct pressure—optimizing combustion and maximizing engine power output. The rod is also compatible with Dongfeng Renault’s common rail fuel system, ensuring seamless integration with other OEM components (e.g., fuel pumps, injectors). Backed by a 24-month warranty against manufacturing defects (e.g., thread damage, corrosion, or O-ring failure), it provides Dongfeng Renault engine owners with reliable fuel system performance and long-term peace of mind