Dongfeng Renault engine parts Fan pulley assembly D5010222001

Built to withstand the torque and radial loads of Dongfeng Renault’s engine fan (which can exceed 50 N·m during high-speed operation), the pulley assembly features a robust steel structure. The pulley body is crafted from high-carbon steel (S45C) with a quenched-and-tempered surface (hardness HRC 35–40), resisting deformation and wear even under continuous heavy loads. The inner bore is precision-machined and heat-treated to ensure a tight, slip-free fit with the fan shaft, while the pulley’s ribbed surface (6 ribs, 3.5mm spacing) is shot-peened to enhance grip with the fan belt—preventing slippage that reduces fan speed and cooling efficiency. Rigorous load testing confirms the assembly endures 150,000+ km of operation without structural damage, far exceeding the lifespan of aluminum or plastic alternatives

Equipped with a high-performance deep-groove ball bearing (sealed to IP6K9K standards), the pulley assembly ensures smooth, low-noise rotation. The bearing is pre-lubricated with high-temperature lithium-based grease (stable from -40°C to 150°C) that eliminates the need for periodic maintenance, while its double-seal design blocks dust, oil, and coolant from entering—preventing premature bearing failure. The bearing’s inner race is press-fitted to the pulley’s hub with zero clearance, reducing radial runout to ≤ 0.05mm (critical for maintaining belt alignment). This low-friction design minimizes power loss (less than 2% of fan drive power) and keeps operating noise below 58 dB at 3000 RPM, enhancing engine efficiency and driver comfort

Designed to withstand the harsh environment of Dongfeng Renault’s engine bay (exposure to heat, oil, coolant, and road salt), the pulley assembly features comprehensive protective treatments. The steel pulley body is coated with a zinc-nickel alloy layer (12μm thickness) that resists rust and corrosion, passing 1,000 hours of neutral salt spray testing without degradation. The bearing’s outer housing is made of corrosion-resistant stainless steel (304 grade), while the pulley’s ribbed surface is coated with a heat-resistant black oxide finish that withstands temperatures up to 200°C (preventing discoloration or warping near the engine block). These treatments ensure the assembly maintains performance and appearance for over 8 years, even in high-humidity or coastal operating conditions

Engineered for efficient replacement in repair shops, the pulley assembly simplifies installation with user-friendly features. It comes with pre-installed mounting bolts (high-tensile M8 grade) that match Dongfeng Renault’s OEM torque specifications (25–30 N·m), and the pulley’s hub is marked with a keyway alignment notch that aligns with the fan shaft—eliminating guesswork during fitting. Installation takes 20–25 minutes using standard hand tools, with no need for specialized equipment. To guarantee quality, each unit is manufactured in an IATF 16949 certified facility and undergoes strict testing: dimensional verification via 3D scanning, bearing runout checks, load resistance trials, and corrosion testing. Backed by a 36-month warranty against manufacturing defects (e.g., bearing seizure, pulley cracking, or bolt failure), it provides Dongfeng Renault engine owners with reliable fan drive performance and long-term peace of mind