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Shacman X3000 Sinotruk Howo T7H Truck Parts Weichai Engine Parts Exhaust Pipe 1003394037 1631
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The 1003394037 1631 is an original equipment (OE) exhaust pipe component designed specifically for Weichai Power (Weifang Diesel Engine Co., Ltd.) heavy-duty diesel engines, such as the WP10 and WP12 series. This part serves as a critical link in the engine exhaust system, connecting the exhaust manifold to downstream components like the turbocharger, aftertreatment system (e.g., SCR or DPF), or main exhaust piping.
The suffix "1631" likely indicates a specific version, configuration, or assembly variant tailored to different vehicle models or emission standards, ensuring precise fitment and performance.
| Attribute | Description |
|---|---|
| Part Name | Exhaust Pipe / Exhaust Connecting Pipe |
| OEM Number | 1003394037 1631 |
| Alternative Reference | May be listed internally as "1003394037-1631" or similar |
| Type | Rigid Metal Pipe Assembly – Fixed Geometry |
| Function | Connects exhaust manifold to turbocharger or downstream exhaust system |
| Position in System | Mid-position exhaust conduit (post-manifold, pre-turbo or post-turbo) |
| Application | Heavy-Duty Trucks, Construction Machinery, Commercial Vehicles |
| Genuine Part | Yes – Manufactured to Weichai OE specifications |
| Quality Standard | Complies with IATF 16949 and Weichai internal quality control systems |
| Parameter | Value |
|---|---|
| Material | Heat-Resistant Cast Iron or Alloy Steel (e.g., stainless steel or silicon-molybdenum cast iron) |
| Wall Thickness | Typically 4–6 mm (varies by design load) |
| Operating Temperature Range | Up to 700°C (intermittent), peak spikes may exceed 800°C |
| Pressure Resistance | Designed for high-pressure pulsating exhaust gases |
| Connection Type | Flanged Joint with Bolt Holes (M10–M14 bolts typical) |
| Sealing Method | High-Temperature Exhaust Gasket (metallic or composite) required between flanges |
| Design Features | Smooth internal contour to reduce backpressure; optimized bend radius |
| Dimensions (Approx.) | Varies by engine layout; typically 300–600 mm in length depending on routing |
| Weight | ~5–12 kg (depending on material and length) |
| Surface Treatment | Bare metal or heat-treated finish; some versions may have anti-corrosion coating |
Note: Exact dimensions and shape are model-specific — always verify against original for replacement.
This exhaust pipe is engineered for integration with Weichai-powered commercial vehicles across major Chinese truck manufacturers.
Sinotruk HOWO Series (China National Heavy Duty Truck Group)
FAW Jiefang Trucks (J6, J7 series)
Shacman (Shaanxi Auto) F2000, F3000, X3000, M3000
Beiben Trucks (North Benz) heavy-duty models
Other heavy trucks and construction machinery using Weichai WP10/WP12 engines
Weichai Power Engines:
WP10 Series (e.g., WP10H, WP10G)
WP12 Series (e.g., WP12H, WP12G)
May also fit certain Euro III, IV, V compliant variants depending on aftertreatment layout
✅ System Compatibility: Must match the exact engine version and emissions configuration (e.g., EGR + SCR setup).
High-Temperature Resistance: Constructed from durable, heat-resistant materials to withstand continuous exposure to hot exhaust gases.
Optimized Gas Flow: Precision casting ensures smooth internal flow path, minimizing exhaust backpressure and improving engine efficiency.
Vibration & Shock Resistant: Robust design handles mechanical stress from engine vibration and road shocks during operation.
Reliable Sealing: Flange geometry matches OEM specs to ensure leak-free connection when used with correct gasket.
Noise Dampening Contribution: Helps reduce pulsation noise when integrated into full exhaust system (in conjunction with muffler).
Corrosion Resistant Finish: Surface treatment provides protection against oxidation and environmental degradation over time.
Emission System Ready: Designed to interface seamlessly with turbochargers, EGR coolers, and SCR systems in modern diesel platforms.
Due to its specificity as an engine-integrated structural component, this part has limited direct aftermarket equivalents. It is primarily identified by the Weichai OE number.
| Brand | Part Number |
|---|---|
| Weichai Original Equipment | 1003394037 1631 (primary ID) |
| Internal Variant Markings | 1003394037-1631, 1003394037A 1631 |
| Aftermarket Suppliers | Rarely available under universal names; often labeled as “Weichai WP10/WP12 exhaust pipe” |
| No Common Global Equivalents | Not interchangeable with Bosch, Cummins, or Volvo parts due to proprietary design |
Search Tips: Use keywords like "1003394037 1631 exhaust pipe", "Weichai WP12 exhaust connector", or "HOWO exhaust pipe for Weichai engine" when sourcing.
Proper installation and maintenance are crucial for safety, performance, and longevity.
Professional Installation Required
→ This is not a DIY-level part. Installation must be performed by trained technicians familiar with Weichai engine layouts.
Use Correct Gaskets Only
→ Always install a new high-temperature exhaust gasket at each flange joint. Reusing old gaskets can lead to leaks.
Torque to Specification
→ Tighten mounting bolts gradually and evenly in a crisscross pattern to avoid warping the flange. Follow manufacturer torque specs (typically 40–60 Nm, depending on bolt size).
Check for Clearance
→ After installation, verify that the pipe does not contact surrounding components (wiring, hoses, chassis) — especially under engine movement.
Inspect for Leaks Post-Installation
→ Start the engine and inspect joints visually and audibly (hissing sound = leak). Use soapy water or smoke test if necessary.
Avoid Forced Fitment
→ Never force misaligned pipes together — this can crack welds or damage mating surfaces. Verify compatibility before assembly.
Regular Inspection Schedule
→ Check every 6,000–10,000 km or 500 operating hours for:
Cracks or fractures near welds or bends
Rust penetration or thinning walls
Loose or broken mounting brackets
Discoloration indicating overheating
Replace When Damaged
→ Even small cracks can cause dangerous exhaust gas leakage, leading to reduced performance, increased emissions, or carbon monoxide entering the cabin.
Match Version Exactly
→ The "1631" suffix is critical — it may denote differences in angle, port orientation, or compatibility with EGR/SCR systems. Using the wrong version can result in improper fit or failed emissions compliance.
Safety Warning
→ Exhaust pipes become extremely hot during operation. Allow engine to cool before inspection or repair. Ensure no flammable materials are near the hot surface.
Long-Haul Freight Transport
Mining & Quarry Operations
Construction Sites
Urban Delivery Fleets (with stop-start cycles)
High-Altitude or Extreme Climate Regions
Packaging: Packed in sturdy cardboard or wooden crate; protected against scratches and moisture
Labeling: Includes part number, barcode, production batch, handling instructions
Warranty: Typically 12 months against manufacturing defects (excluding thermal cracking due to misuse)
Origin: China (manufactured by Weichai or authorized supplier)
The Exhaust Pipe 1003394037 1631 is a high-strength, precision-engineered component essential for the safe and efficient operation of Weichai WP10 and WP12 series diesel engines. As a key segment of the exhaust system, it ensures reliable gas flow, minimizes backpressure, and supports optimal engine performance and emissions control.
With applications across Sinotruk HOWO, FAW Jiefang, Shacman, and Beiben trucks, this part must be replaced with exact OE-match components to maintain system integrity.
