Dongfeng Renault engine parts upper main bearing shell D5010224360

Built to withstand the extreme radial loads of Dongfeng Renault’s engine (up to 120 kN per bearing during combustion cycles), the bearing shell features a high-performance dual-metal structure. The base layer is made of low-carbon steel (1010 steel) that provides structural rigidity, preventing deformation under high stress. The sliding surface is coated with a 0.04mm-thick lead-indium-copper alloy (PbInCu) overlay—selected for its exceptional anti-friction properties and ability to absorb minor contaminants (e.g., tiny metal particles or carbon deposits). Unlike single-metal bearings that wear rapidly, this dual-layer design resists scuffing even during oil pressure fluctuations and extends service life by 50% compared to standard bearings. Rigorous load testing confirms the shell endures 200,000+ km of operation without excessive material loss, ensuring reliable performance in heavy-duty commercial applications

The bearing shell’s inner sliding surface is honed to an ultra-smooth finish (surface roughness Ra ≤ 0.15μm) using precision diamond honing technology. This micro-textured surface creates tiny reservoirs that retain a thin, uniform oil film (8–12μm) between the bearing and crankshaft journal—critical for reducing friction and preventing metal-to-metal contact. The surface finish also minimizes oil flow resistance, allowing lubricant to circulate freely and carry away heat. Unlike bearings with rough surfaces that break down oil films and cause premature wear, this ultra-precise finish maintains lubrication even at high engine speeds (up to 6,000 RPM) and cold startup conditions. Additionally, the overlay is plated with a 0.005mm-thick nickel barrier layer that enhances adhesion to the steel base, preventing delamination under extreme heat

Tailored to Dongfeng Renault’s engine lubrication system, the bearing shell features a precision-engineered oil groove and hole layout. A circumferential main groove (2mm wide, 0.6mm deep) runs along the shell’s midpoint, connected to a centered oil hole (5mm diameter) that aligns with the engine block’s oil passage. This design ensures a continuous supply of pressurized oil to the bearing surface, even during low-speed operation or cold starts. The groove also acts as a heat sink, channeling hot oil away from the sliding surface to reduce thermal stress. Unlike bearings with poorly positioned grooves that restrict oil flow, this optimized design reduces bearing temperature by 18% and prevents oil starvation— a major cause of bearing failure. The groove edges are also chamfered (0.2mm radius) to avoid sharp edges that could damage the crankshaft journal

Each upper main bearing shell undergoes rigorous quality control to meet Dongfeng Renault’s engine standards and international bearing specifications (ISO 4389). Key tests include: dimensional verification via coordinate measuring machine (CMM), hardness testing (HRC 52–56 for steel base, HV 28–36 for alloy overlay), oil groove geometry inspection, and friction coefficient testing under simulated engine loads. The shell is manufactured in an IATF 16949 certified facility, with each unit marked with a unique traceability code that links to its production batch, raw material source, and test results. It is fully compatible with Dongfeng Renault’s recommended engine oils (5W-40/10W-40, API CK-4) and maintenance intervals, ensuring optimal performance when paired with OEM-grade lubricants. Backed by a 36-month warranty against manufacturing defects (e.g., overlay delamination, dimensional inaccuracies, or oil hole blockage), it provides Dongfeng Renault engine owners with reliable crankshaft support and long-term peace of mind