Urea Pump Nozzle Doser Injector 612640130089 for Weichai WP10/WP12/WP13

Urea Pump Nozzle Doser Injector – Weichai Part Number 612640130089

Product Overview (H2):
This OEM-grade urea doser injector (612640130089) is engineered specifically for Weichai heavy-duty diesel engines equipped with Selective Catalytic Reduction (SCR) aftertreatment systems. It precisely meters AdBlue/DEF into the exhaust stream to reduce NOx emissions, ensuring compliance with Euro IV, V, and VI standards. Built with corrosion-resistant materials and precision-machined nozzles, this injector delivers consistent spray patterns for optimal reagent atomization and system longevity.

Key Benefits (H3):

• Direct OEM replacement – no adapter or modification required

• High thermal stability for continuous exhaust gas temperatures

• Anti-clogging nozzle design with self-cleaning pulse capability

• 100% leak-tested before shipment

• Compatible with Weichai WP10, WP12, WP13, and WP17 engine series

Technical Specifications (H2):

Product Attributes (H3):

Functional Description (H3):
The injector operates on pulse-width modulated signals from the ECU. Upon receiving a command, the solenoid coil lifts the armature, allowing pressurized urea solution (5–6 bar) to pass through the swirl chamber and exit via a laser-drilled orifice. The resulting fine mist ensures rapid evaporation and even distribution across the SCR catalyst face, maximizing NOx conversion efficiency while minimizing deposit formation. Integrated thermal shielding protects internal components from radiant heat, and the IP67-rated connector ensures reliable electrical contact in harsh under-chassis environments.

Compatibility & Cross-Reference (H3):

• Original Weichai part: 612640130089

• Replaces: 612640130088, 612640130090 (variant)

• Fits engine models:

• Weichai WP10.336E40

• Weichai WP12.375E50

• Weichai WP13.500E501

• Weichai WP17.700E50

• Also compatible with certain Sinotruk, Shacman, and Foton trucks using Weichai powertrains (verify ECU calibration).

Installation Notes (H3):

• Always replace the O-ring and copper washer when installing.

• Torque the injector to 25–30 N·m – do not over-tighten.

• Prime the urea line before first start to avoid dry firing.

• Use only ISO 22241-compliant AdBlue/DEF fluid.

• After installation, perform an SCR functional test via diagnostic tool.

Quality Assurance (H3):
Each unit undergoes:

• 100% solenoid resistance check

• High-pressure leak test (10 bar air under water)

• Spray pattern visualization (high-speed camera)

• Thermal cycling test (–30°C ↔ +110°C, 50 cycles)

• Vibration test per ISO 16750-3 (truck grade)

Packaging & Delivery (H3):

• Individually sealed anti-static bag + foam-lined carton

• Includes: 1 x injector, 1 x copper sealing ring, 1 x O-ring, 1 x installation guide

• Lead time: 1–3 business days (stock items)

• Warranty: 12 months or 100,000 km (whichever comes first)

Internal Linking Strategy (H4 – visible to user):
To help you find related components, we recommend these pages:

• Weichai Urea Pump Assembly – complete kit

• SCR System Maintenance Guide – best practices

• AdBlue/DEF Quality and Storage Tips

• Weichai ECU Calibration Parameters for Doser Control

• Exhaust Temperature Sensors for Weichai