Dongfeng Loong-gine engine parts Top cover plate assembly 1701305-TV100

Built to protect the engine’s valve train, camshaft, and upper lubrication system from external contaminants, the assembly features a multi-layer sealing design. The bottom edge is equipped with a high-temperature resistant nitrile rubber gasket (shore hardness 70±5) that forms a tight seal with the cylinder head, preventing oil leakage and blocking dust, water, and road debris from entering. The gasket’s integrated steel skeleton enhances compression resistance, maintaining sealing performance even after 10,000 engine startup/shutdown cycles. Additionally, the cover plate’s raised ribs form a labyrinth seal around wiring harness penetrations, preventing oil seepage along wires. In pressure tests, it maintains a sealed environment at 0.3bar internal pressure—equivalent to extreme engine vibration conditions—with no leakage

Engineered to endure the high vibration and thermal stress of Loong-gine engines (up to 1500rpm idle, 2500rpm maximum), the cover plate is fabricated from die-cast A380 aluminum alloy with a tensile strength of 280MPa—outperforming standard aluminum by 35%. The upper surface integrates 8 longitudinal and 4 transverse reinforcing ribs (12mm height) that distribute stress evenly, reducing maximum deflection to ≤1.2mm under 500N load (equivalent to extreme vibration). The mounting holes are reinforced with brass inserts (heat-pressed into the aluminum) to prevent thread stripping from repeated disassembly, ensuring secure attachment to the cylinder head. The cover’s surface undergoes T6 heat treatment, enhancing hardness to HB 90-100 and resisting deformation from engine heat (operating temperature up to 120℃)

Designed to complement the Loong-gine’s thermal management system, the cover plate features a heat-dissipating structure that improves upper-engine heat transfer. The aluminum alloy material’s thermal conductivity (150W/(m·K)) efficiently transfers heat from the valve train to the external environment. The upper surface’s ribbed design increases heat dissipation area by 40% compared to flat covers, while the 5mm-diameter ventilation holes (distributed in 3 rows) promote air circulation between the cover and engine compartment. A heat-insulating coating on the inner surface (ceramic-based, thickness 0.8mm) reduces heat radiation to the engine’s upper electrical components (e.g., ignition coils), maintaining their operating temperature within 85℃. In thermal tests, the cover reduces upper-engine temperature by 8-10℃ during continuous high-load operation

Optimized for efficient engine maintenance, the cover plate assembly features a user-centric design that reduces service time. It comes pre-assembled with the nitrile rubber gasket (factory-glued to the cover) and 16 M8×20 galvanized bolts (grade 8.8), eliminating the need for separate gasket installation and bolt sourcing. The bolts are torque-marked (25-30N·m) to ensure correct tightening without over-torque damage. The cover’s front edge includes 3 quick-access inspection holes (equipped with rubber plugs) that allow valve clearance checks without full disassembly. Clear labeling (“FRONT” and cylinder number markers) prevents reverse installation, while the smooth outer surface (Ra ≤1.6μm) resists oil accumulation and is easy to clean. A single technician can complete installation or removal in 25 minutes or less, minimizing truck downtime for engine servicing