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The WEICHAI WP12 Fine Filter is the second-stage precision filter element in the three-stage fuel filtration system of WP12 heavy-duty diesel engines. Designed to remove microscopic contaminants as small as 3-5 microns, the WEICHAI WP12 Fine Filter ensures that only ultra-clean diesel fuel reaches the high-pressure common rail pump and injectors. As genuine WEICHAI Engine Parts, this fine filter is manufactured to original equipment specifications, delivering superior filtration efficiency and extended injector life across all WP12 variants from 336 HP to 550 HP.
The WEICHAI WP12 Fine Filter (OEM Part No. 1000422382/1000422382A) is the second stage of the three-level “nanny” fuel filtration system used in WP12 common rail diesel engines. Installed downstream of the primary fuel filter/water separator, the fine filter removes microscopic particulates as small as 3-5 microns, ensuring that only ultra-clean fuel enters the high-pressure common rail pump and precision injectors. This progressive filtration design dramatically reduces injector wear and extends the service life of the entire fuel system [0†L11-L12][5†L27-L28].
The WEICHAI WP12 Fine Filter features a spin-on design with a sturdy steel or composite housing and a high-density pleated paper filter media. The filter measures Φ110×263 mm (approximately 4.33×10.35 inches) with an M32×1.5 connection thread, making it a direct replacement for the OEM filter. The fine filter also incorporates an integral O-ring seal that must be lubricated with clean fuel before installation to prevent leaks and ensure proper sealing [8†L2-L4][18†L2-L4].
The WEICHAI WP12 Fine Filter is part of the engine’s advanced three-stage “nanny” filter architecture. This system includes a primary filter (coarse/water separator), a fine filter (precision stage), and often an additional final filter for the most demanding applications. The three-stage design significantly improves fuel adaptability, protects fuel injectors and the high-pressure oil pump more effectively, and prolongs the use life of the common rail system [5†L27-L28][3†L5-L8].
Applications for the WEICHAI WP12 Fine Filter include Shacman X3000/F3000, Sinotruk HOWO A7/T7H, Beiben trucks, JAC trucks, CAMC vehicles, Yutong and Kinglong buses, XCMG equipment, and marine WP12C engines. The filter is compatible with WP12 power outputs from 336 HP to 550 HP across Euro III, Euro IV, Euro V, and China VI emission standards. The fine filter is also cross-compatible with several universal part numbers including FF5740 (Fleetguard), WDK11102/4 (Mann), and 612630080087 (Weichai), making it widely available through multiple supply channels [8†L2-L4][17†L2-L4].
Counterfeit fine filters often use inferior filter media with inadequate filtration efficiency and poor structural integrity, leading to premature injector wear, power loss, and increased fuel consumption. Always source genuine WEICHAI WP12 Fine Filter components from authorized distributors to ensure proper fitment, reliable filtration performance, and long-term fuel system protection. The WP12 engine platform has undergone over 45,000 hours of cumulative bench testing and over 50 million kilometers of road testing, proving the reliability of every fuel filter component.
| NO. | Part NO | Description |
|---|---|---|
| 1 | 1000422382 / 1000422382A | Fine Filter / Precision Fuel Filter (Φ110×263mm, M32×1.5 thread, extended-life 60,000 km) [8†L2-L4][9†L5-L6] |
| 2 | 612630080087 | Fine Filter Element (Φ110×263mm, M32×1.5 thread, Weichai OE reference) [8†L2-L4][18†L2-L4] |
| 3 | 1000422385 | Fine Filter / Refine Filter (WP12 engine, OEM 1301111-00564-001) [13†L2-L4] |
| 4 | 1000447498 / 1000447498A | Fuel Fine Filter (WP12/WP13, OEM precision filter element) [10†L10-L11] |
| 5 | 612630080203 / 612630080203A | Fuel Coarse Filter (Primary stage, WP12/WP13) [10†L10-L11] |
| 6 | 1000422381 / 1000422381A | Fuel Water Separator (Primary filter, pre-filtration stage) [10†L9-L10] |
| 7 | 1000424916 / 1000424916A | Fuel Water Separator (Extended-life 60,000 km, primary stage) [9†L5-L6] |
| 8 | 612630080554 | Fuel Filter Bracket / Fuel Filter Holder (WP12, filter mounting support) [15†L3-L6] |
| 9 | 1000053558 | Diesel Fuel Filter (110×230mm, paper+metal construction, alternate fitment) [16†L6-L7] |
The table above lists common service parts for the WEICHAI WP12 Fine Filter and the complete fuel filter group. When replacing the fine filter (1000422382/1000422382A), always use genuine WEICHAI filter elements to ensure proper filtration efficiency (3-5 micron nominal rating) and reliable system performance. The fine filter is compatible with all WP12 engine variants and has a service life of up to 60,000 km under normal operating conditions [9†L5-L6].
The WEICHAI WP12 Fine Filter uses high-density pleated paper filter media that captures microscopic contaminants down to 3-5 microns, significantly outperforming standard filters. This precision filtration prevents abrasive wear of the high-pressure common rail pump and injectors, extending fuel system life and maintaining optimal engine performance.
The fine filter is a critical component of the WP12’s three-level filtration system. Working in sequence with the primary water separator (1000422381) and the final stage, this progressive filter architecture ensures fuel is progressively cleaned, protecting the fuel injector and high-pressure oil pump more effectively while prolonging use life [5†L27-L28][3†L5-L8].
The WEICHAI WP12 Fine Filter (1000422382) features extended-life filter media designed to deliver up to 60,000 km (6×10⁴ km) of service under normal operating conditions. This long service interval reduces maintenance frequency and lowers total operating costs for fleet operators [9†L5-L6].
No modifications required for WP12 engines in Shacman, Sinotruk, Beiben, JAC, CAMC, Yutong, Kinglong, SDLG, XCMG, marine, and generator applications. Available for Euro III, Euro IV, Euro V, and China VI emission variants. The M32×1.5 thread and Φ110×263 mm dimensions ensure a perfect fit [8†L2-L4][18†L2-L4].
Each WEICHAI WP12 Fine Filter undergoes rigorous quality control including filter media integrity testing, burst pressure testing, dimensional inspection, and sealing surface verification. IATF 16949 certified quality with full traceability. All filters meet or exceed OE filtration standards.
Worldwide shipping from regional warehouses. Free fuel filter installation procedures, priming instructions, and troubleshooting guides provided with each order. Volume discounts available for fleet customers and engine rebuilders.
Unlike aftermarket filters that use substandard filter media with inadequate filtration efficiency, our genuine WEICHAI WP12 Fine Filter is manufactured to original equipment specifications with documented quality control. The filter element is constructed from high-quality pleated paper media and metal end caps, ensuring structural integrity under high fuel flow conditions and resisting collapse even when the filter becomes loaded with contaminants. The extended-life filter media (1000422382) is specifically designed to deliver up to 60,000 km of service under normal operating conditions [9†L5-L6].
The fine filter’s precision filtration capability is critical for protecting the common rail system. The high-pressure pump and injectors operate with extremely tight internal clearances; even microscopic abrasive particles can cause rapid wear and failure. The WEICHAI WP12 Fine Filter captures particles down to 3-5 microns, preventing scoring of plunger and barrel assemblies and extending the service life of the entire fuel system. The three-stage “nanny” filter architecture ensures progressively cleaner fuel as it moves through the system, providing comprehensive protection [5†L27-L28][3†L5-L8].
Technical support includes fine filter installation procedures: use a filter wrench to loosen and remove the old filter, collect any spilled fuel, clean the filter mounting surface, lubricate the new O-ring with clean diesel fuel, hand-tighten until the gasket contacts, then tighten an additional 3/4 to 1 turn, prime the fuel system (operate the manual priming pump until resistance is felt), and check for leaks. The fuel system must be ventilated after the filter element is replaced to remove trapped air. Troubleshooting guides for symptoms like hard starting (clogged filter), loss of power (restricted flow), and black smoke (inadequate filtration or water contamination) are provided [14†L13-L19].
For fleets, sample testing is available. Order one WEICHAI WP12 Fine Filter for trial; volume pricing applies. Many customers report over 500,000 km trouble-free fuel system operation after replacing aftermarket filters with our genuine components. We provide cross-reference support for part number verification—please provide your engine serial number for accurate matching. We stock both standard fine filters (1000422382) and the complete three-stage filter set including water separator (1000422381) and coarse filter (612630080203).
Also monitor the engine’s fuel consumption and exhaust emissions. A gradual increase in fuel consumption may indicate a clogged fine filter restricting flow, forcing the high-pressure pump to work harder. Excessive black smoke from the exhaust may indicate poor combustion due to inadequate fuel filtration or water contamination. The three-stage “nanny” filter architecture, including the fine filter, is designed to provide progressively cleaner fuel, ensuring that the common rail system receives only ultra-clean fuel for optimal combustion [5†L27-L28][3†L5-L8].
For severe-duty applications (mining, construction, heavy haul, marine), reduce filter replacement intervals to every 15,000-20,000 km (9,000-12,000 miles) or 250 operating hours. High ambient temperatures, dusty environments, and frequent stop-start cycles accelerate filter loading. Marine applications require additional water drain checks—saltwater environments can increase water contamination in fuel storage tanks.
When installing a new WEICHAI WP12 Fine Filter, ensure that all mounting surfaces are clean and free of old sealant residue. Use a lint-free cloth to clean the filter mounting base. Lubricate the new O-ring with clean diesel fuel before installation to prevent pinching and ensure proper sealing. After installation, prime the fuel system thoroughly and start the engine, checking for leaks while the system is under pressure. If any leaks are detected, tighten the filter or replace the seal.
Maintain a logbook of all fuel system maintenance: dates of fine filter changes, fuel pressure readings, fuel consumption trends, and any abnormal findings. For fleet operators, tracking fuel pressure drop over time is a powerful predictive maintenance tool—a gradual decline in pressure at full load often indicates progressive filter clogging, providing ample warning before complete blockage occurs. The three-stage “nanny” filter design provides multiple indicators of filter condition, allowing proactive maintenance before engine performance is affected [5†L27-L28][3†L5-L8].
In summary, the WEICHAI WP12 Fine Filter features precision 3-5 micron filtration, extended-life filter media (up to 60,000 km service), 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 fine filter directly impacts fuel system reliability, injector longevity, and overall engine performance. The WP12 series engines can operate in temperatures from -35°C to 50°C and at altitudes up to 4,000 meters, making filter quality critical for consistent operation [5†L27-L28][3†L5-L8].
For workshops performing in-frame overhauls, we recommend ordering the WEICHAI WP12 Fine Filter (1000422382) together with a complete fuel system service kit including primary water separator (1000422381), coarse filter (612630080203), filter bracket (612630080554), and replacement O-rings. This approach eliminates hidden failures and gives your customer a worry-free warranty period. The filter elements are pre-inspected for media integrity, flow capacity, and sealing surface quality before shipment.
Our inventory includes both standard fine filters for highway truck applications and extended-life variants (1000422382) for severe-duty applications. The standard WEICHAI WP12 Fine Filter provides excellent service life for long-haul trucking, while the extended-life variant features enhanced filter media that delivers up to 60,000 km of service, making it ideal for fleets seeking to reduce maintenance frequency and operating costs [9†L5-L6]. We provide cross-reference support for part number verification— please provide your engine serial number for accurate matching.
We provide after-sales documentation including filter media specifications, filtration efficiency test results, burst pressure certification, dimensional inspection reports, and installation torque specifications upon request. Every WEICHAI WP12 Fine Filter 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. The WEICHAI WP12 Fine Filter includes OEM references 1000422382/1000422382A (fine filter), 612630080087, 1000422385, and 1000447498/1000447498A. Always prime the fuel system after filter replacement, lubricate the O-ring before installation, and use only genuine WEICHAI filter elements to ensure proper filtration efficiency (3-5 microns) and system reliability [5†L27-L28][3†L5-L8].
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