Dongfeng Renault Engine parts Cylinder Head Assembly D5010477503

The D5010477503 assembly comes fully pre-assembled with critical OEM-grade components, including high-temperature-resistant valves, precision-machined valve seats, durable valve guides, and calibrated valve springs. Each component is selected to meet Dongfeng Renault’s strict performance standards: the valves (made of heat-resistant alloy steel) withstand temperatures up to 1,200°C during combustion, while the valve seats feature wear-resistant coatings to ensure tight sealing and long-term durability. This integrated design eliminates the need for separate component sourcing and manual adjustment, reducing assembly time and ensuring consistent combustion chamber performance—directly enhancing engine power, fuel efficiency, and emissions compliance

Crafted from premium aluminum-silicon alloy (with a silicon content of 7-9%) via low-pressure casting, the cylinder head’s core structure delivers exceptional strength-to-weight ratio, thermal conductivity, and corrosion resistance. The material undergoes T6 heat treatment to enhance hardness (reaching 90-110 HB) and fatigue resistance, enabling it to withstand the extreme thermal cycles of engine operation—from cold starts (-30°C) to high-temperature combustion (over 2,000°C in the combustion chamber). Its superior thermal conductivity ensures efficient heat dissipation, preventing localized overheating that could cause warping, crack formation, or valve seat damage—significantly extending the engine’s service life in high-load applications

The D5010477503 cylinder head assembly features a multi-layered sealing system to ensure airtight and watertight performance. The cylinder head gasket (included with the assembly) is made of high-temperature composite material with metal reinforcement layers, designed to maintain a tight seal between the head and engine block even under extreme pressure and thermal expansion. Additionally, the valve cover mating surface is precision-machined to a smooth finish (Ra 0.8 μm or lower) and pre-treated with a heat-resistant sealant, preventing oil leakage from the valve train. These sealing features eliminate common issues like coolant loss, compressed air leakage, or oil contamination—critical for maintaining engine cooling efficiency and lubrication performance

Every D5010477503 assembly undergoes a series of stringent quality tests to meet Dongfeng Renault’s engineering benchmarks. Key inspections include: dimensional accuracy verification (via coordinate measuring machines to check port geometry, mounting hole alignment, and deck flatness), pressure testing (for coolant and oil passages to detect leaks), and valve train performance testing (to ensure proper valve lift, timing, and sealing). It also undergoes thermal cycle testing (simulating 1,000+ engine start-stop cycles) and durability trials (on dynamometers under full-load conditions). Only assemblies that pass 100% of these tests are approved for distribution, ensuring consistent reliability, compatibility, and long-term performance in harsh operating environments