Dongfeng GX Cylinder assembly with liner process assembly 5003910-C6100

Constructed with premium materials, the assembly endures high combustion pressure and temperature. The cylinder liner is made of centrifugally cast gray cast iron (grade HT300) with pearlitic matrix, offering a Brinell hardness of 200–240 HB—resisting deformation under 18MPa peak combustion pressure. The liner’s outer surface is coated with a 0.1mm-thick phosphating layer, enhancing adhesion to the engine block and preventing micro-movement. The cylinder body uses nodular cast iron (QT450-10), providing tensile strength of 450 MPa to bear engine vibration and assembly loads. All components undergo magnetic particle inspection to eliminate internal defects (e.g., cracks), ensuring no failure under long-term operation. It passes 1,000 hours of engine bench testing at full load, confirming structural integrity and durability

The assembly integrates multi-layer sealing structures to maintain engine fluid integrity. The liner’s top and bottom use copper-asbestos gaskets (thickness 1.2mm) with high-temperature resistance (up to 400°C), creating a tight seal between the liner and cylinder head/block—preventing combustion gas leakage. The liner’s outer wall has an O-ring groove (diameter 5mm) that accommodates a nitrile rubber O-ring, sealing the coolant passage and avoiding coolant mixing with engine oil. The cylinder body’s bolt holes (12 M16×2.0 threads) are precision-tapped to ensure uniform clamping force (120±10 N·m) when mounted to the engine block, eliminating gaps that cause leakage. Tested under 1.2MPa coolant pressure for 30 minutes, it shows no leakage, ensuring stable engine cooling and lubrication

Engineered exclusively for Dongfeng GX’s engine (e.g., 4-cylinder diesel/petrol variants), this assembly matches OEM dimensions with ±0.05mm tolerance. The cylinder body’s mounting flange (height 25mm) aligns exactly with the engine block’s mating surface, and the liner’s protrusion height (0.08–0.12mm) meets factory specs to ensure proper head gasket compression. The assembly’s oil passage holes and coolant channels are positioned identically to the OEM part, avoiding re-drilling or modification of the engine block. The liner’s chamfered top edge (30° angle) matches the piston’s top land, preventing piston ring damage during assembly. Rigorously tested on Dongfeng GX engine test benches, it passes 200+ fitment checks to guarantee consistency. For repair shops, this means a direct replacement that maintains engine performance, avoiding issues like uneven compression or coolant flow

The assembly is designed to optimize heat transfer, critical for preventing engine overheating. The cylinder liner’s outer surface features spiral cooling grooves (depth 1.5mm, pitch 8mm) that increase contact area with coolant by 25%, accelerating heat dissipation from the liner to the coolant system. The cylinder body’s material (QT450-10) has a thermal conductivity of 50 W/(m·K), ensuring efficient heat transfer to the engine block. The liner’s uniform wall thickness (tolerance ±0.05mm) prevents hot spots that could degrade lubrication or cause liner distortion. Tested under extreme load (engine running at 6,000 RPM for 2 hours), the assembly maintains liner temperature at 180–200°C (within safe limits), avoiding piston ring sticking or liner scuffing. For owners, this ensures stable engine operation even in high-load scenarios (e.g., heavy towing, uphill driving), extending engine service life