8980116045 Original Isuzu 4JJ1 Engine Fuel Injector for Excavator

Part number 8980116045 (also commonly written as 8-98011604-5) is a special part number for the high-pressure common rail injector (nozzle) assembly of Isuzu's original 4JJ1 series diesel engine. This injector is the core precision actuator of the engine fuel system, responsible for injecting high-pressure fuel into the cylinder with precise fuel quantity, optimal atomization state, and accurate timing, directly determining the engine's power output, fuel economy, and emission level. As an original standard component, it is mainly suitable for Hitachi hydraulic excavators equipped with Isuzu 4JJ1 engines, such as Hitachi ZX130-5A, ZX195-5A and other models.

This injector is a highly integrated electronic hydraulic precision valve, which is a key component of the high-pressure common rail fuel system. Its core function is to receive instructions from the engine control unit (ECU), quickly and accurately control the injection opening and closing of high-pressure fuel through internal solenoid valves, achieve multiple injections (pre injection, main injection, post injection), optimize the combustion process, improve power, and reduce emissions and noise. As an original component, it usually adopts the technology and manufacturing standards of top suppliers such as Denso, and contains precision fuel injector fittings (needle valve and valve body), solenoid valves, control pistons, and hydraulic amplifiers inside. Its working pressure is extremely high (usually up to 1600-2000 bar or higher), and the requirements for material wear resistance, sealing, and dimensional accuracy are extremely demanding.

The maintenance core of this fuel injector lies in ensuring fuel cleanliness, regular professional testing, and standardized disassembly and assembly. Fuel system protection: High quality low sulfur diesel that meets national standards must be used, and fuel filters (including coarse and fine filters) must be replaced strictly according to maintenance intervals. This is the most important measure to prevent fuel injectors from being worn or stuck due to impurities. Standardized operation: When disassembling and installing fuel injectors, special tools must be used to tighten the clamping bolts and high-pressure oil pipe joints strictly according to torque and sequence requirements, and replace all relevant sealing gaskets. After installation, it is necessary to exhaust the system and may require coding learning or flow compensation value writing for new injectors, which requires professional equipment and software support.