Dongfeng Renault Engine parts ZSZ engine braking D4327504

Designed to deliver robust auxiliary braking force, this ZSZ engine brake generates a retardation power of up to 280-320 kW (depending on ZSZ engine displacement and RPM) — significantly reducing reliance on mechanical brakes during downhill driving, heavy hauling, or high-speed deceleration. By altering the engine’s valve timing (keeping exhaust valves partially open during the compression stroke), it converts the engine into an air compressor, creating resistance that slows the vehicle without overheating brake pads or causing brake fade. At typical operating RPM (1800-2200 rpm), the brake can provide up to 80% of the vehicle’s required retardation force, extending mechanical brake life by 300-500% and reducing maintenance costs. This performance is critical for commercial vehicles (e.g., trucks, buses) that frequently operate in mountainous areas or carry heavy loads

The engine braking component features a high-response hydraulic or pneumatic control mechanism (matching the ZSZ engine’s original actuation system) that ensures instant activation and deactivation. The control unit receives signals from the vehicle’s brake pedal or dedicated switch, triggering a piston/cylinder assembly to adjust the rocker arm position—modifying valve timing within 0.1-0.2 seconds. This rapid response eliminates lag, providing immediate braking force when needed. The system also includes a pressure-regulating valve that adjusts braking intensity based on engine RPM and load, preventing excessive resistance that could strain the engine. Additionally, the control lines are made of high-pressure-resistant hoses (rated for 30-50 MPa) with corrosion-resistant fittings, ensuring leak-free operation even in harsh under-hood environments

Built to withstand extreme engine conditions, the core components of this engine brake are crafted from high-strength alloy steel (e.g., 42CrMo) and heat-resistant cast iron (e.g., HT300). The rocker arm contact surfaces and valve actuators undergo carburizing and quenching treatments, achieving a surface hardness of HRC 58-62—resisting wear even under continuous high-temperature (up to 400°C) and high-pressure operation. The component’s housing is made of heat-dissipating aluminum alloy (with cooling fins where applicable) to manage heat generated during braking, preventing thermal deformation. All moving parts are lubricated via the engine’s existing oil system, reducing friction and extending service life. The component also undergoes 10,000+ cycle durability testing at the factory to ensure reliable performance over 500,000+ kilometers of vehicle operation

This ZSZ engine braking component meets international safety standards (e.g., ECE R13 for braking systems) and Dongfeng Renault’s internal engine protection criteria. It includes built-in safety mechanisms to prevent engine damage: a speed limiter that deactivates the brake if engine RPM exceeds 2500 rpm (avoiding over-revving), and a fuel cut-off interlock that ensures the brake only operates when the engine is not injecting fuel (preventing incomplete combustion and carbon buildup). Additionally, the component’s design maintains proper engine oil pressure and lubrication flow, avoiding dry friction in the valve train. For ease of maintenance, it features accessible inspection ports and wear indicators that allow technicians to check component condition without full disassembly—reducing downtime and service costs