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- Wanda Plaza, Jinan, Shandong, China
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The WEICHAI WP12 Water Pump Assembly is a high-performance centrifugal coolant circulation component engineered specifically for the WP12 diesel engine platform. This complete assembly ensures consistent coolant flow through the engine block, cylinder head, and radiator, maintaining optimal operating temperatures even under maximum load conditions. Proper cooling system function is critical for engine longevity, and the WEICHAI WP12 Water Pump Assembly provides fleet operators and technicians with a reliable, leak-free solution for thermal management. For genuine replacement parts and comprehensive engine service components, always source from verified WEICHAI Engine Parts to guarantee OEM fitment, consistent quality, and long-term reliability.
The WEICHAI WP12 Water Pump Assembly is a belt-driven centrifugal pump mounted on the front of the engine block, responsible for circulating coolant through the engine’s cooling passages, radiator, and heater core. As the heart of the engine’s cooling system, this assembly maintains the WP12 engine within its optimal operating temperature range of 85°C to 95°C, preventing overheating during heavy-duty operation and ensuring proper warm-up during cold starts. The pump is driven directly by the crankshaft via the serpentine belt system, with a pulley diameter optimized for the WP12’s operating speed range of 600 to 2,100 rpm.
The water pump housing is manufactured from high-grade cast iron or die-cast aluminum alloy (depending on application), offering excellent corrosion resistance and thermal stability. The impeller, typically of closed or semi-open design, is precision-cast from stainless steel or engineered composite material and dynamically balanced to minimize vibration and cavitation. The WEICHAI WP12 Water Pump Assembly features a mechanical seal with carbon vs. ceramic or silicon carbide sealing faces, rated for continuous operation at coolant temperatures up to 120°C and pressures up to 3.5 bar (standard) or 5.0 bar (pro models). The seal is spring-loaded to maintain contact despite impeller runout and thermal expansion.
The WEICHAI WP12 Water Pump Assembly is designed for the 11.596-liter inline-six WP12 engine used in heavy trucks (HOWO T7H, SHACMAN Delong F3000, FOTON Auman, Jiefang), construction machinery (loaders, excavators, bulldozers), marine propulsion, and stationary generator sets. The assembly is compatible with all WP12 variants from Euro III through Euro V emission standards, as well as China VI engines. The pump is mounted directly to the engine block or timing gear housing using four to six mounting bolts with a paper or rubber-coated steel gasket ensuring a leak-proof seal. For the WP12 engine, the water pump is side-mounted and does not connect directly to the fan drive, reducing component vibration and extending service life.
In addition to the basic pump body and impeller, the complete WEICHAI WP12 Water Pump Assembly includes the pulley, mounting gasket, O-ring seals for inlet and outlet connections, and all necessary mounting hardware. Some variants also include a belt tensioner bracket or a thermostatic bypass port for integrated coolant flow control. Replacement water pump assemblies are available as complete units or as individual components (pump body only, impeller kit, seal kit, or gasket set). Genuine assemblies include a traceable batch number and quality certification.
For marine applications, the WEICHAI WP12 Water Pump Assembly is supplied with a seawater-friendly bronze impeller and additional corrosion protection coatings. For construction machinery operating in dusty environments, the pump features a heavy-duty bearing with enhanced sealing against particulate ingress. The pump’s flow rate is engineered to match the WP12’s heat rejection requirements, typically delivering 250-350 liters per minute at rated engine speed.
Every genuine WEICHAI WP12 Water Pump Assembly undergoes 100% leak testing, dynamic balancing, and dimensional inspection. Counterfeit pumps often use inferior bearings that fail prematurely, seals that leak after thermal cycling, or impellers that are not balanced correctly, leading to cavitation, overheating, and catastrophic engine damage. Always source from authorized distributors to guarantee proper material composition, precise fitment, and reliable cooling performance.
| NO. | Part NO | Description |
|---|---|---|
| 1 | 612630060080 | Water Pump Assembly (Shanxi, Cast Iron, 3.5 bar) |
| 2 | 612630060361 | Water Pump (WP12 Standard, Aluminum Housing) |
| 3 | 612630060343 | Water Pump Assembly (WD/WP10 & WP12 Compatible) |
| 4 | 612600061945 | Water Pump Assembly (High-Flow, 612600061945) |
| 5 | 612630061073 | Water Pump Assembly (10PK, WP12 Series) |
| 6 | 612630061257 | Water Pump (WP12, Fits Delong, Auman, Sany, XCMG) |
| 7 | 1000693783 | Water Pump (WP12S400E201, for HOWO T7H & Shandeka C7H) |
| 8 | 612630060663 | Water Pump Assembly (WP12 Heavy-Duty) |
| 9 | 612600060569 | Water Pump (WP10/WP12 Universal) |
| 10 | 612630060056 | Water Pump O-Ring Seal (D34×2, WP12/WP13) |
| 11 | 612600050042 | Sealing Washer (For Water Pump Mounting) |
| 12 | 90003962019 | Hexagon Screw Plug (Coolant Drain) |
| 13 | 1003081464 | Temperature Sensor (Coolant, WP12) |
| 14 | 612630060390 | Water Pump (WD615/WP12 HOWO Shacman) |
| 15 | 1001357036 | Water Pump Assembly (10PK, Complete Kit) |
Our WEICHAI WP12 Water Pump Assembly is manufactured from high-grade cast iron alloy with a corrosion-resistant coating, providing 30% greater strength than standard iron and exceptional durability in high-temperature environments. The housing is pressure-tested to 5.0 bar to ensure leak-free operation.
The precision-cast stainless steel or composite impeller is dynamically balanced to G6.3 grade, delivering consistent coolant flow of 250-350 L/min across the entire engine speed range. This ensures stable engine temperatures even under maximum load conditions.
Our water pump features a high-grade mechanical seal with carbon vs. ceramic or silicon carbide sealing faces, rated for continuous operation at 120°C and pressures up to 5.0 bar. The seal is spring-loaded to maintain contact despite thermal expansion and impeller runout.
Our pumps are manufactured using original WP12 engine drawings, ensuring bolt holes align perfectly with the engine block or timing gear housing. No modifications required for installation on HOWO T7H, SHACMAN Delong F3000, FOTON Auman, Jiefang, and other WP12-powered vehicles.
Each WEICHAI WP12 Water Pump Assembly includes the mounting gasket, O-ring seals for inlet/outlet connections, and all necessary mounting bolts with sealing washers. No need to source separate hardware or risk using incorrect gaskets.
We stock complete water pump assemblies and individual components in warehouses across Asia, Europe, and the Americas. Express shipping options minimize downtime for fleet operators.
Unlike generic aftermarket water pumps that use inferior bearings and low-grade seals, our WEICHAI WP12 Water Pump Assembly is manufactured to original equipment specifications. The double-row sealed ball bearing is pre-lubricated with high-temperature grease rated for -40°C to +180°C, eliminating the need for maintenance and ensuring a service life exceeding 500,000 km. The mechanical seal is manufactured with precision-lapped sealing faces, providing a leak-free service life of over 10,000 operating hours.
Furthermore, our pumps feature a side-mounted design that does not connect directly to the fan drive, a configuration specific to the WP12 engine that reduces vibration transmitted to the pump bearings. This design reduces the load on the water pump shaft by up to 40% compared to fan-mounted designs, significantly extending bearing and seal life. The pump housing incorporates a bleed port for air removal during coolant filling, preventing cavitation and ensuring proper flow from the first start.
Technical documentation included with the WEICHAI WP12 Water Pump Assembly provides correct bolt torque specifications (M8 bolts: 25 Nm, M10 bolts: 45 Nm), gasket installation procedures (clean dry surfaces, no sealant required), belt tension specifications (400-600 N for 8PK belt, 500-700 N for 10PK belt), and a troubleshooting guide for common issues such as coolant leaks (replace seal or gasket) and overheating (verify flow rate and belt tension).
For large fleet customers, we offer sample evaluation: order one WEICHAI WP12 Water Pump Assembly for trial installation. After validation, volume pricing applies. Many return customers report that our pumps exceed the original equipment service life, with over 600,000 km of reliable operation, compared to low-cost alternatives that often fail within 150,000 km due to bearing or seal failure.
Beyond the checklist above, pay attention to any change in heater performance. A heater that blows cold air at idle but warm air at higher engine speeds often indicates insufficient coolant flow from a failing water pump. This symptom may appear long before overheating occurs, providing early warning of pump failure. Investigate immediately to prevent engine damage.
For engines operating in extreme conditions (desert environments, heavy construction, continuous high-load operation), consider more frequent water pump inspections every 50,000 km. High ambient temperatures and sustained high engine speeds accelerate bearing wear and seal degradation. For marine applications, inspect the pump annually for saltwater corrosion, paying special attention to the housing and mounting flange area. Replace the pump every 2,000 operating hours as preventive maintenance in marine service.
When replacing a failed water pump, always replace the serpentine belt, belt tensioner, and idler pulley at the same time. A worn belt can slip and cause insufficient coolant flow, while a failing tensioner can apply uneven load to the new pump bearing. Use only OEM-grade coolant with the correct additive package to protect the new pump’s seal and bearing. After installation, run the engine with the radiator cap off to bleed air from the system, then check for leaks and proper flow with the engine at operating temperature.
Finally, maintain a service log for the WEICHAI WP12 Water Pump Assembly recording installation dates, belt tension readings, coolant type and change intervals, and any observed leaks or noises. This data helps predict when components are approaching end of life. For fleet operators, standardized replacement of water pump assemblies every 400,000 km eliminates cooling system-related breakdowns and protects engines from overheating damage.
In summary, the WEICHAI WP12 Water Pump Assembly is the heart of the WP12 engine’s cooling system. Its robust cast iron construction, precision-balanced impeller, and advanced mechanical seal ensure reliable coolant circulation for hundreds of thousands of kilometers. Whether you are replacing a failed pump on a HOWO T7H tractor, maintaining a fleet of SHACMAN Delong F3000 dump trucks, or servicing a WP12 marine propulsion engine, using a genuine water pump assembly ensures that your engine remains within its optimal operating temperature range, preventing costly overheating damage.
For workshops performing engine overhauls or cooling system service, we recommend ordering the WEICHAI WP12 Water Pump Assembly together with a new serpentine belt, belt tensioner, thermostat, and coolant. The water pump is a wear item that should be renewed preventatively rather than waiting for failure. We provide installation guides with torque specifications, belt tension procedures, and cooling system bleeding instructions for all WP12 engine variants.
Our inventory includes both standard water pumps for on-highway trucks and heavy-duty versions for construction and marine applications. For generator sets where the engine operates at constant speed, we offer pumps with extended-life bearings rated for 10,000+ continuous operating hours. Specify your application when ordering to receive the correct configuration.
We also provide after-sales documentation including material certificates, seal test reports, and dynamic balance certificates upon request. Every WEICHAI WP12 Water Pump Assembly is packaged in a foam-lined box to prevent damage during transit. Bulk orders receive custom export crating and documentation.
All specifications are based on original WEICHAI WP12 engine data. Actual product configurations may vary by sub-model (Euro III, Euro V, marine, construction, etc.). Always verify part numbers against your engine’s serial number plate before ordering.
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If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.
We are a first-class heavy duty vehicles and spare parts supplier in China. which covers from engine, gearbox, cab, axle assemblies to main assembly accessories, electrical parts and other chassis parts like brake, clutch and steering parts.
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