Dongfeng LoongGine Engine parts Rear gear chamber 1003121-E9500

Constructed from high-quality HT300 gray cast iron, this rear gear chamber delivers exceptional structural strength and load-bearing capacity—critical for housing and protecting the engine’s rear gear train (including timing gears, idler gears, and auxiliary drive gears). The HT300 cast iron material offers a tensile strength of 300MPa and excellent wear resistance, withstanding the continuous mechanical loads and friction generated by gear rotation (up to 3000 RPM) without deformation or cracking. It undergoes a normalized heat treatment process to eliminate internal stress, ensuring dimensional stability even under extreme engine operating temperatures (ranging from -30°C to 150°C). Additionally, the cast iron surface is subjected to a precision grinding process, achieving a smooth finish (Ra ≤ 0.8μm) on gear mating surfaces—reducing friction and extending the service life of both the chamber and internal gears

Engineered as a critical component for maintaining engine oil pressure and preventing leaks, the 1003121-E9500 rear gear chamber features a multi-layer sealing system. The mating surface with the engine block is equipped with a groove for a high-temperature resistant silicone rubber gasket (included with the assembly), which compresses uniformly during installation to form a tight seal. The chamber’s oil passage ports are sealed with precision-machined O-rings made of nitrile rubber, resistant to engine oil, coolant, and high temperatures—preventing cross-contamination between fluids. Furthermore, all bolt holes are equipped with copper washers to distribute clamping force evenly, avoiding local deformation of the cast iron surface that could lead to leaks. Through 500 hours of pressure testing (at 0.8MPa oil pressure), the chamber shows no signs of leakage, ensuring reliable oil retention for the engine’s gear train and auxiliary components

The rear gear chamber is designed with integrated features to optimize the performance and protection of the engine’s rear gear train. It includes internal oil channels that direct pressurized engine oil to the gear shaft bearings and meshing surfaces, ensuring continuous lubrication to reduce friction and wear. The chamber’s internal ribs are strategically positioned to enhance structural rigidity while guiding oil flow back to the engine’s oil pan—preventing oil pooling and ensuring efficient lubricant circulation. Additionally, the chamber’s cover plate (integrated into the assembly) features a vent hole with a breather valve, which releases excess pressure generated by gear rotation and oil splashing—preventing oil foaming and maintaining stable oil pressure. This integrated design not only simplifies the engine’s overall structure but also ensures the gear train operates in a controlled, well-lubricated environment, extending the engine’s service life

Designed for hassle-free installation and maintenance, the 1003121-E9500 rear gear chamber undergoes strict precision machining to ensure all mounting surfaces and interfaces are ready for direct assembly. It comes with pre-marked alignment indicators that help technicians quickly position the chamber correctly on the engine block, reducing installation errors. The assembly includes all required mounting bolts (high-strength alloy steel, heat-treated for durability) and sealing components, eliminating the need for separate part sourcing. No specialized tools are required—standard torque wrenches and socket sets are sufficient to complete installation, with a recommended torque specification of 35-40 N·m for the mounting bolts. For maintenance, the chamber’s accessible design allows technicians to inspect or replace internal gears without removing the entire engine from the vehicle, minimizing downtime. This combination of precision manufacturing and user-friendly design makes the chamber a reliable and efficient component for Dongfeng LoongGine engine maintenance