Dongfeng Renault Engine parts Oil Cooler Assembly D5010550127

The D5010550127 assembly features an optimized core structure with dense, multi-channel aluminum tubes and corrugated cooling fins, maximizing the heat transfer surface area (up to 1.2㎡) to rapidly dissipate heat from engine oil. Designed to handle the high thermal loads of Dongfeng Renault’s heavy-duty engines (often 6-11L displacement), it efficiently reduces oil temperature from 120-150°C (post-engine circulation) to the optimal operating range of 80-100°C. This prevents oil thinning (which reduces lubrication effectiveness) and thermal degradation (which forms harmful sludge and deposits), directly extending oil service life and protecting critical engine components (e.g., crankshafts, camshafts, and bearings) from premature wear

Crafted from high-strength 3003 aluminum alloy for the cooler core and 6061 aluminum for the end caps, the assembly delivers exceptional resistance to high oil pressure (up to 800 kPa, the maximum operating pressure of Dongfeng Renault engines) and corrosion. The core undergoes a vacuum brazing process to create leak-proof, high-integrity joints between tubes and fins, while the end caps are welded using robotic precision to avoid cracks or weak points under cyclic pressure. Unlike low-grade coolers, it withstands the constant pressure fluctuations of engine operation and resists corrosion from oil additives (e.g., detergents and anti-oxidants), ensuring a service life of 250,000+ km under normal maintenance

The D5010550127 oil cooler assembly incorporates a dual-seal system to prevent oil leakage and cross-contamination with coolant (for liquid-cooled models). The oil inlet/outlet ports feature nitrile rubber O-rings with high-temperature resistance (-30°C to 150°C) and excellent oil compatibility, creating a tight seal against the engine’s oil gallery. Additionally, the core-to-end cap connections are sealed with a high-temperature epoxy resin, reinforcing the brazed joints and preventing oil seepage even under thermal expansion. Each assembly undergoes a 100% pressure test (using compressed air at 1,000 kPa for 10 minutes) and a leak test (submerging in water to detect bubbles), ensuring zero oil loss during operation

Every D5010550127 assembly undergoes a series of stringent quality inspections to meet Dongfeng Renault’s heavy-duty engine engineering benchmarks. Key tests include: heat dissipation efficiency testing (in a controlled environment to verify temperature reduction under simulated engine loads), pressure cycle testing (to simulate 100,000+ engine start-stop cycles), and corrosion resistance testing (exposing samples to oil and coolant mixtures for 500 hours). It also undergoes dimensional accuracy checks (via coordinate measuring machines) to ensure mounting holes and port threads align with the engine’s specifications. Only assemblies that pass all these tests are approved for distribution, ensuring consistent performance, compatibility, and reliability for Dongfeng Renault engine operators