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The WEICHAI WP12 Intake System Assembly is a complete air delivery system that supplies clean, precisely metered combustion air to the WP12 heavy-duty diesel engine. As genuine WEICHAI Engine Parts, this intake system assembly ensures optimal air-fuel ratio, complete combustion, and reduced emissions across all WP12 variants from 336 HP to 550 HP. The WEICHAI WP12 Intake System Assembly features turbocharged intercooling technology, a four-valve-per-cylinder design, and a durable cast aluminum intake manifold for exceptional airflow efficiency.
The WEICHAI WP12 Intake System Assembly is a complete air management system that delivers clean, filtered, pressurized air to the engine’s combustion chambers. The system consists of the air cleaner assembly, intake ductwork, turbocharger compressor housing, intercooler, intake manifold (612630120013), intake manifold gasket set (612630120005), intake connector pipe (612630120012), intake connector gasket (612630120002), and a full suite of air management sensors.
The WEICHAI WP12 Intake System Assembly is designed around a turbocharged intercooled architecture. Ambient air first passes through a high-efficiency air cleaner, then enters the turbocharger compressor where it is compressed and heated. The pressurized air flows through an intercooler which reduces air temperature before entering the cast aluminum intake manifold. The cooled, dense air then flows through the cylinder head intake ports to the combustion chambers.
The WEICHAI WP12 Intake System Assembly incorporates the engine’s four-valve-per-cylinder cylinder head design (4 valves per cylinder, 24 valves total). The four-valve structure significantly improves volumetric efficiency by reducing intake flow resistance, enabling the engine to achieve a higher power output of 480 HP while maintaining low fuel consumption of just 192g/kW·h. The optimized intake and combustion systems have widened the engine’s economic operation range.
The WEICHAI WP12 Intake System Assembly includes critical monitoring sensors that provide real-time data to the ECU for optimal engine management. These include the intake air pressure and temperature sensor (612630120004), the air intake pressure sensor, the exhaust gas temperature sensor (612640130648) for SCR system monitoring, and the differential pressure sensor (610800190624) for DPF monitoring. The integrated intake heating function meets start requirements in cold regions down to -35°C.
Applications for the WEICHAI WP12 Intake System Assembly include Shacman X3000/F3000, Sinotruk HOWO, Beiben trucks, JAC trucks, CAMC vehicles, Yutong and Kinglong buses, SDLG wheel loaders, XCMG equipment, marine WP12C engines, and stationary generator sets. The intake system is compatible with WP12 power outputs from 336 HP to 550 HP across Euro III, Euro IV, Euro V, China VI, and marine IMO II emission standards. The system is co-designed by Weichai European R&D Center and AVL Bosch with synchronized development.
| NO. | Part NO | Description |
|---|---|---|
| 1 | 612630120013 | Intake Manifold / Air Intake Manifold (Cast Aluminum, WP12 Euro III) |
| 2 | 612630120012 | Intake Connector Pipe / Connecting Pipe (WP12 Euro III) |
| 3 | 612630120005 | Intake Manifold Gasket Set (6 pieces, Intake Manifold to Cylinder Head) |
| 4 | 612630120002 | Intake Connector Gasket / Intake Manifold Heater Gasket (2 pieces) |
| 5 | 612630120004 | Intake Air Pressure and Temperature Sensor (Inlet Manifold Monitoring) |
| 6 | 612600110456 | Intake Manifold Cover Gasket (Intake Manifold Cover Seal) |
| 7 | 1000363301 | Intake Manifold Assembly (WP12.375E55, 276KW/376PS, Engineering Machinery) |
| 8 | 612630120423 | Intake Manifold Assembly (WP12.430E50, 316KW/430PS, Truck Application) |
| 9 | 612600112340 | Air Intake Manifold (OEM 1212111-00302-001, L980mm, WP12/WD12/WD615/WD618) |
| 10 | 612630110012 | Compressor Intake Funnel / Intake Funnel (Turbocharger Inlet) |
The table above lists common service parts for the WEICHAI WP12 Intake System Assembly. When replacing any intake system component, always verify the part number against your engine code and emission standard. The intake manifold (612630120013) is a direct replacement for WP12 Euro III engines, while the intake manifold assembly (1000363301) is designed for WP12.375E55 engineering machinery applications. All gaskets (612630120005, 612630120002) must be replaced with new seals during any intake system service to prevent air leaks.
Our WEICHAI WP12 Intake System Assembly uses turbocharged intercooling technology that compresses intake air and then reduces its temperature before entering the engine. This process increases air density by up to 30%, allowing more fuel to be burned efficiently for increased power output while reducing exhaust emissions and improving fuel economy.
The WEICHAI WP12 Intake System Assembly works with the engine’s four-valve-per-cylinder cylinder head (4 valves per cylinder, 24 valves total). This design reduces intake flow resistance by approximately 40% compared to two-valve designs, enabling the engine to achieve up to 480 HP output while maintaining a minimum fuel consumption of just 192g/kW·h, significantly lower than competing engines.
The WEICHAI WP12 Intake System Assembly includes a full suite of monitoring sensors that provide real-time data to the ECU. The intake air pressure and temperature sensor (612630120004) measures charge air density, enabling precise fuel injection control. The exhaust gas temperature sensor (612640130648) monitors SCR system operation, while the differential pressure sensor (610800190624) tracks DPF filter condition for optimal regeneration timing.
No modifications required for WP12 engines in Shacman, Sinotruk, Beiben, JAC, CAMC, Yutong, Kinglong, SDLG, XCMG, marine, and generator applications. Available for Euro III (612630120013, 612630120012), Euro IV/V, China VI, and marine engine variants. Complete gasket sets available for leak-free installation.
Each WEICHAI WP12 Intake System Assembly component undergoes rigorous quality control including dimensional inspection, casting integrity testing, gasket seal verification, and sensor calibration validation. IATF 16949 certified quality with full traceability. Intake manifolds are pressure-tested to ensure no air leaks that would affect engine performance.
Worldwide shipping from regional warehouses. Free intake system installation torque charts (intake manifold bolts: 25-35 N·m, cross-tightening sequence), gasket replacement procedures, and troubleshooting guides provided with each order. Volume discounts available for fleet customers and engine rebuilders.
Unlike aftermarket intake components that use inferior castings with porosity defects and inadequate sealing surfaces, our genuine WEICHAI WP12 Intake System Assembly is manufactured to original equipment specifications with documented quality control. The cast aluminum intake manifold (612630120013) is precision-machined to ensure a perfectly flat mounting surface, eliminating the need for excessive gasket sealant and preventing air leaks that would cause power loss, increased fuel consumption, and black smoke emissions.
The WEICHAI WP12 Intake System Assembly’s turbocharged intercooled architecture is a key factor in the engine’s exceptional fuel economy. The WP12 engine achieves a minimum fuel consumption of just 192g/kW·h, significantly lower than many competing engines in its class. The four-valve-per-cylinder structure ensures sufficient intake air for complete combustion, which, combined with the advanced BOSCH high-pressure common rail system, enables multiple injections such as pre-injection and post-injection, reducing noise and vibration by 20% compared to mechanical pump systems.
Technical support includes intake system installation procedures: ensure engine is cool, remove old intake manifold, clean cylinder head mounting surface thoroughly, install new gaskets (612630120005 and 612630120002), position intake manifold (612630120013) with locating dowels, torque manifold bolts to 25-35 N·m in a symmetrical cross-tightening sequence (working outward from the center), install intake connector pipe (612630120012) with new gasket, connect intake air pressure sensor (612630120004), and verify no air leaks by running the engine and checking for intake hissing sounds. Troubleshooting guides for symptoms like black smoke (air intake restriction or boost leak), loss of power (air intake system leak or clogged air filter), and turbocharger surge (boost pressure sensor failure) are provided.
For fleets, sample testing is available. Order one WEICHAI WP12 Intake System Assembly for trial; volume pricing applies. Many customers report over 500,000 km trouble-free intake system operation after replacing cracked or leaking original manifolds with our genuine components. We provide cross-reference support for part number verification—please provide your engine serial number for accurate matching. We stock complete intake manifold assemblies for Euro III (612630120013, 612630120012), Euro IV/V, China VI, and marine applications, as well as individual replacement gaskets, intake connector pipes, and sensor kits.
Also monitor the engine’s exhaust smoke color and fuel consumption. Black smoke indicates incomplete combustion, often caused by intake air restriction (clogged air filter), boost pressure leaks (loose clamps or damaged hoses), or a failed turbocharger. Blue smoke indicates oil entering the intake system, often from turbocharger seal failure. White smoke at start-up indicates coolant entering the intake system, often from a cracked cylinder head or failed head gasket.
For severe-duty applications (mining, construction, heavy haul, marine), reduce intake system inspection intervals to every 25,000 km (15,000 miles) or 250 operating hours. High ambient temperatures, dust, and vibration accelerate intake gasket degradation and air filter loading. Replace the air filter element twice as frequently in dusty environments. Marine applications require additional corrosion checks—saltwater environments can accelerate corrosion of the cast aluminum intake manifold and turbocharger compressor housing.
When installing a new WEICHAI WP12 Intake System Assembly component, ensure that all mating surfaces are perfectly clean and free of old gasket material, corrosion, and debris. Use a plastic scraper (not metal) to avoid scratching the aluminum surface. Align the intake manifold with the locating dowel pins before tightening bolts. Use a torque wrench to achieve the specified bolt torque of 25-35 N·m in a symmetrical cross-tightening sequence. After installation, start the engine and spray soapy water around all intake connections while idling— bubbles indicate air leaks requiring immediate correction.
Maintain a logbook of all intake system maintenance: dates of air filter changes, intake manifold bolt torque verification, gasket replacement intervals, intake air pressure sensor readings, and any abnormal findings. For fleet operators, tracking intake air restriction (measured in kPa) using a manometer is a powerful predictive maintenance tool—a gradual increase in restriction indicates progressive air filter clogging, providing ample warning before filter replacement is needed. Regular intake system inspection and maintenance ensure the WP12 engine continues to deliver optimal power, fuel economy, and emissions performance.
In summary, the WEICHAI WP12 Intake System Assembly features turbocharged intercooled architecture, four-valve-per-cylinder design (4 valves per cylinder, 24 valves total), cast aluminum intake manifold (612630120013), precision sensor suite (612630120004, 612640130648, 610800190624), and direct fitment for all WP12 applications. Whether you are rebuilding a Shacman X3000, Sinotruk HOWO, Beiben truck, Yutong bus, SDLG wheel loader, marine vessel, or generator set, choosing a genuine intake system assembly directly impacts engine performance, fuel economy, emissions compliance, and overall vehicle reliability.
For workshops performing in-frame overhauls, we recommend ordering the WEICHAI WP12 Intake System Assembly as a complete kit including the intake manifold (612630120013), intake connector pipe (612630120012), intake manifold gasket set (612630120005, 6 pieces), intake connector gasket set (612630120002, 2 pieces), intake manifold cover gasket (612600110456), and the intake air pressure and temperature sensor (612630120004). This approach eliminates hidden failures and gives your customer a worry-free warranty period. All intake components are pre-inspected for casting integrity, dimensional accuracy, and gasket seal quality before shipment.
Our inventory includes both standard intake manifold assemblies for Euro III applications (612630120013, 612630120012) and heavy-duty variants for Euro IV/V, China VI, and marine applications (1000363301, 612630120423). The standard WEICHAI WP12 Intake System Assembly provides excellent service life for long-haul trucking, while heavy-duty variants feature enhanced casting thickness and additional reinforcement ribs for mining, construction, and marine applications. We provide cross-reference support for part number verification—please provide your engine serial number for accurate matching.
We provide after-sales documentation including intake manifold dimensional inspection reports, gasket sealing surface specifications, intake system installation torque charts, sensor calibration data, diagnostic trouble code (DTC) guides for intake-related faults, and preventive maintenance schedules upon request. Every WEICHAI WP12 Intake System Assembly component is packaged in protective foam-lined boxes to prevent damage during shipping. Bulk orders receive custom palletizing and export documentation assistance. Express shipping available for urgent repairs—most orders dispatched within 24 hours.
All specifications based on original WEICHAI WP12 engine data. Cross-check part numbers with engine serial number and emission standard. The WEICHAI WP12 Intake System Assembly includes OEM references 612630120013 (intake manifold), 612630120012 (intake connector pipe), 612630120005 (intake manifold gasket set), 612630120002 (intake connector gasket), 612630120004 (intake air pressure and temperature sensor), and 612600110456 (intake manifold cover gasket). Always torque intake manifold bolts to 25-35 N·m in a cross-tightening sequence, use new gaskets at every service, and verify no air leaks after installation.
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