这是一款专为豪沃HOWO 420卡车（拖拉机）配套的D12 Truck柴油发动机，对应重汽型号为D12.42。

• 核心性能：额定功率309kW（420马力），转速2200r/min，缸径×行程126×130mm，采用增压中冷进气方式，动力强劲，适合重载运输与工程机械场景。

• 结构优势：基于成熟的D12平台开发，结构可靠耐用，配件通用性强，维修保养便捷，能适应矿山、基建、长途物流等恶劣工况。

• 应用场景：主要配套豪沃420系列牵引车、拖拉机及重载工程车辆，广泛用于大宗货物运输、矿山作业、工程建设等高强度作业。

This is a D12 Truck diesel engine specifically matched for HOWO Truck 420 (Tractor), with the corresponding Sinotruk model D12.42.

• Core Performance: Rated power 309kW (420HP) at 2200rpm, bore×stroke 126×130mm, equipped with turbocharged intercooled intake system, delivering strong power for heavy-duty transportation and engineering machinery.

• Structural Advantages: Developed on the proven D12 platform, it features reliable and durable structure, high parts commonality, and easy maintenance, adapting to harsh conditions such as mining, construction, and long-haul logistics.

• Application: Primarily used in HOWO 420 series tractors and heavy-duty engineering vehicles, widely applied in high-intensity operations like bulk cargo transportation, mining, and construction.