Description
Product Overview
Heavy-duty electronically controlled fuel injectors are subjected to prolonged exposure to high-pressure fuel exceeding 1,000 bar, extreme engine compartment temperatures, and vibrations, as well as contamination from impure diesel. This leads to scratches and wear on internal components such as the needle valve and sleeve sealing surfaces, while rubber seals harden and leak over time. Replacing the entire injector unit alone is costly. This repair kit comprehensively covers all vulnerable points—including core injection pairs, pressure sealing valves, mounting gaskets, and oil passage seals—allowing complete replacement of internal components after disassembly. It effectively resolves issues such as injection failure, leakage, and pressure loss, making it ideal for maintenance of 4307475 model electronic common rail injectors used in large mining excavators, heavy-duty wheel loaders, and long-haul heavy trucks.
Key Advantages
- **Tempered and hardened alloy steel needle valve stem**: Mirror-polished surface ensures smooth operation and excellent wear resistance.
- **Fully heat-treated needle valve assembly**: Entire length features segmented mirror finishing, minimizing friction during reciprocating motion, resisting damage from contaminated diesel, and maintaining precise sealing clearance over extended periods to prevent fuel leakage and coarse atomization.
- **Segmented stepped guide sleeve**: Ensures coaxial alignment and prevents needle valve misalignment or sticking.
- **Precisely matched guide sleeve design**: The stepped limiting structure accurately controls the needle valve’s movement path, ensuring consistent coaxiality during reciprocation and eliminating sticking caused by vehicle vibration or disrupted injection timing.
- **Multi-layer sealing system**: Provides multiple barriers against fuel leakage and backflow of exhaust gases. Includes thickened copper thermal insulation gasket, multi-color (yellow, green, black) fluororubber O-rings of various sizes, and a miniature metal pressure valve disc. The copper gasket buffers high temperatures, layered rubber rings seal high- and low-pressure oil circuits, and the micro valve disc stabilizes internal oil pressure, fully resolving cylinder head oil seepage and rapid rail pressure drop.
- **Uniformly sized components**: No on-site grinding or fitting required. All metal parts and seals are manufactured with strict tolerances matching original specifications, enabling direct replacement without manual adjustment, significantly reducing repair time.
- **Multi-color fluororubber seals**: Resistant to diesel degradation, withstand wide temperature fluctuations in engine compartments, and remain stable without swelling, hardening, or cracking even after prolonged diesel immersion, ensuring long-term sealing performance.
- **Factory-calibrated flow matching**: Each kit undergoes full testing for fuel flow rate, high-pressure retention, and atomization quality. After installation, the injector delivers uniform spray patterns and stable rail pressure, quickly restoring engine power and idle smoothness to factory standards.
Kit Contents
- Extended mirror-polished hardened alloy steel needle valve stem: 1 piece
- Stepped needle valve guide sleeve: 1 piece
- Miniature metal pressure sealing valve disc: 1 piece
- Thickened copper thermal insulation sealing gasket: 1 piece
- Complete set of multi-specification fluororubber sealing O-rings (yellow, green, black)
Applicable Applications
Suitable for large-scale mining excavators, heavy-duty wheel loaders, long-haul heavy-duty freight trucks, and high-power stationary diesel generator sets equipped with 4307475 model electronic common rail injectors. Ideal for continuous heavy-duty operations in mines, long-distance highway transport, construction sites with high temperatures and dust, and environments where impure diesel causes corrosion—providing comprehensive internal precision component replacement for heavy-duty electronic common rail injectors.
Basic Product Specifications
- Product Name: 4307475 Electronic Common Rail Injector Repair Kit
- Part Number: 4307475
- Main Materials: Tempered hardened alloy steel (needle valve, sleeve), stainless steel valve disc, copper gasket, fluororubber sealing rings
- Structural Features: Complete set of core injection components + multi-layer sealing materials covering all internal wear-prone areas
- Operating Conditions: Ultra-high pressure fuel injection sealing, continuous engine compartment vibration due to thermal cycling, and corrosion from impure diesel in heavy-duty electronic common rail diesel engines
- Product Status: Brand new complete injector repair kit, pre-calibrated at factory with matched clearances, high-pressure sealing integrity, and atomization flow rate Packaging: Individually sealed in separate plastic compartments, with metal precision components and rubber seals isolated to prevent damage or scratches to the mirror surface of the needle valve during transit. Available for single-unit retail or bulk purchase by box, suitable for cross-border small parcel shipping.
