Dongfeng Renault engine parts Fan belt tensioner D5010224369

Equipped with a dual-stage hydraulic damping system and high-tensile coil spring, the tensioner automatically adjusts fan belt tension to Dongfeng Renault’s specified range (90–110 N). The hydraulic damper absorbs sudden tension spikes (e.g., during fan startup or engine acceleration) to prevent belt shock, while the coil spring provides constant force to counteract belt elongation from heat and wear. Unlike manual tensioners that require frequent re-adjustment, this automatic design maintains optimal tension 24/7—reducing belt slip by 95% and extending fan belt life by up to 60%. Rigorous testing confirms the tensioner retains tension accuracy (±4 N) through 120,000+ engine cycles, ensuring the fan operates at consistent speed to keep the engine within safe temperature limits

Built to withstand the harsh conditions of engine bay operation (vibration, high heat, and road debris), the tensioner features a rugged construction. The tensioner arm and mounting bracket are crafted from heat-treated aluminum alloy (6061-T6), which offers a tensile strength of 310 MPa and excellent corrosion resistance—avoiding bending or rust even in high-humidity environments. The pulley is made of glass fiber-reinforced nylon (PA66-GF30) with a hardened steel bearing (sealed to IP6K9K standards), reducing friction and ensuring smooth rotation (operating noise ≤ 56 dB at 3500 RPM). The hydraulic cylinder uses high-temperature-resistant seals (FKM material) that withstand temperatures up to 160°C, preventing fluid leakage and ensuring long-term damping performance

Designed to handle extreme temperature fluctuations in Dongfeng Renault engines (from -40°C cold starts to 160°C high-load operation), the tensioner’s components are engineered for thermal stability. The coil spring is made of chrome-silicon steel that retains its force accuracy (±3%) across the entire temperature range, avoiding cold-brittle failure or heat-induced relaxation. The hydraulic fluid is formulated to remain viscous in low temperatures (no freezing at -40°C) and stable in high heat (no evaporation at 160°C), ensuring consistent damping even in extreme climates. This adaptability ensures the tensioner operates reliably in snowy winters or hot summers, preventing fan belt failure that could lead to engine overheating

Engineered for efficient replacement in repair shops, the tensioner simplifies installation with user-friendly features. It comes fully pre-assembled (pulley, arm, hydraulic cylinder, and spring already fitted), requiring only the tightening of 2 OEM-matched bolts (included) to the engine’s mounting points—installation takes 15–20 minutes with standard hand tools. The pulley is marked with alignment indicators that match the engine’s accessory pulleys, ensuring correct positioning without guesswork. To guarantee quality, each unit is manufactured in an IATF 16949 certified facility and undergoes strict testing: tension force verification, bearing wear tests, thermal cycling trials, and vibration resistance checks. Backed by a 36-month warranty against manufacturing defects (e.g., spring failure, hydraulic leakage, or pulley cracking), it provides Dongfeng Renault engine owners with reliable cooling system performance and long-term peace of mind