Dongfeng LoongGine engine auto parts Rear oil seal assembly 1005090-E4200

Built to eliminate oil leakage from the crankshaft rear end—critical for maintaining engine lubrication—the assembly features an advanced dual-lip design. The primary sealing lip is made of hydrogenated nitrile rubber (HNBR) with a Shore hardness of 75±5, creating a tight contact with the crankshaft’s rotating surface to block 99.8% of engine oil. The secondary lip acts as a dust and moisture barrier, preventing road debris, water, and sand from entering the engine and contaminating the lubricating oil. A built-in stainless steel garter spring applies uniform radial force (6-9N) to the primary lip, compensating for minor crankshaft wear and maintaining sealing integrity over time. Leakage rate is tested to ≤0.008g/h, far below the industry limit of 0.1g/h

Engineered to endure the harsh conditions of LoongGine’s high-performance engines, the seal assembly uses premium materials for exceptional durability. The HNBR sealing lips resist degradation at temperatures up to 160℃—ideal for the crankshaft rear end, where exhaust heat and friction raise ambient temperatures. The material also resists swelling from synthetic and mineral engine oils, maintaining flexibility and sealing performance for ≥200,000km. The metal skeleton (SPCC cold-rolled steel) undergoes phosphating and electrophoretic coating, providing rigid support and corrosion resistance. The lip’s surface is coated with a PTFE composite layer, reducing friction coefficient by 40% and minimizing wear on both the seal and crankshaft

Optimized to withstand the vibration and slight misalignment of heavy-duty engine operation, the assembly integrates anti-fatigue features. The dual-lip structure’s flexible design absorbs 65% of torsional vibration from the crankshaft (up to 25g vibration loads, ISO 16750-3), preventing lip deformation and leakage. The seal’s inner diameter features a micro-groove texture that retains a thin oil film, lubricating the lip during rotation and reducing wear. It can adapt to minor crankshaft eccentricity (≤0.12mm) caused by long-term use, maintaining consistent sealing contact without premature failure. This adaptability ensures stable performance even in engines operating under continuous high load

The rear oil seal assembly is engineered for efficient installation and long-term cost savings, ideal for fleet maintenance and engine overhauls. Its rigid metal skeleton allows easy press-fit installation using a standard seal driver tool, requiring no specialized equipment. The outer diameter’s knurled texture enhances retention force with the flywheel housing bore, preventing slippage during engine operation. Installation takes two technicians 60 minutes to complete—40% faster than non-OE seals with complex mounting requirements. By preventing oil leakage, it reduces engine oil replenishment costs by 35% and avoids expensive repairs caused by oil-contaminated components (e.g., clutch, flywheel). Backed by a 1.5-year/150,000km warranty, it is a cost-effective solution for heavy-duty engine maintenance