Shandong Shengyue Technology Development Co.,Ltd is one of the most professional weichai 400hp engine assembly 11.6-liter, heavy-duty inline-six diesel engine wp12400e201 manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.
Weichai 400HP Engine Assembly 11.6-liter, heavy-duty inline-six diesel engine Wp12400E201
General Specifications & Basic Performance
| Parameter Item | Specification Data / Description | Remarks |
|---|---|---|
| Engine Model | WP12.400E201 | Belongs to Weichai's classic Landking WP12 heavy-duty series. |
| Type | Inline, water-cooled, 4-stroke | Standard layout for heavy-duty commercial trucks. |
| Aspiration | Turbocharged & Intercooled | Increases air intake density to optimize combustion efficiency. |
| Number of Cylinders | 6 | Inline 6-cylinder layout offers excellent natural balance. |
| Valves per Cylinder | 4 (2 intake, 2 exhaust; 24 valves in total) | Overhead valve (OHV) design for smoother gas exchange under heavy loads. |
| Bore × Stroke | 126 mm × 155 mm | Classic long-stroke, high-torque configuration. |
| Displacement | 11.596 L (commonly referred to as a 12L engine) | Provides a massive displacement foundation for heavy hauling and hill climbing. |
| Compression Ratio | 17 : 1 | High compression ratio translates to superior thermal efficiency. |
Power & Fuel Economy Parameters
| Parameter Item | Specification Data / Description | Remarks |
|---|---|---|
| Rated Power | 400 HP (294 kW) | Achieved at a rated engine speed of 1900 rpm. |
| Maximum Torque | 1800 N·m | Delivered within a wide torque band of 1000–1400 rpm. |
| Max Torque Engine Speed | Approx. 1200 rpm | Demonstrates a distinct low-speed, high-torque characteristic. |
| Min. Fuel Consumption at Full Load | ≤ 192 g/kW·h | Highly fuel-efficient within the economic RPM zone. |
| Idle Speed | 600 ± 50 rpm | Stable, low-vibration idling speed. |
| Max. No-Load Speed | 2150 ± 50 rpm | Controlled by the governor to prevent engine overspeed (runaway). |
| Applicable Gross Vehicle Weight (GVW) | 40 to 60 tons (Vehicle + Cargo) | Ideal for 6×4 tractors, heavy tippers, and construction dump trucks. |
Mechanical Structure & Manufacturing Craftsmanship
| Parameter Item | Specification Data / Description | Remarks |
|---|---|---|
| Cylinder Block Structure | Monoblock high-strength cast iron | Gantry-style structure with reinforcing grids for extreme rigidity. |
| Cylinder Head Type | Split-type (individual head for each cylinder) | Prevents thermal deformation interference; significantly lowers repair costs. |
| Crankshaft Type | Monoblock forged steel crankshaft | Offers much higher strength and fatigue resistance compared to cast iron. |
| Cylinder Liner Type | Dry, replaceable alloy cast iron liner | Simplifies boring and honing operations during major engine overhauls. |
| Piston Material | Aluminum alloy piston | Features internal cooling oil galleries and wear-resistant ring carrier inserts. |
| Flywheel / Housing Interface | SAE 1 / SAE 14 | Industry-standard interface, highly compatible with FAST manual/AMT gearboxes. |
Auxiliary Systems (Fuel, Lubrication & Cooling)
| Parameter Item | Specification Data / Description | Remarks |
|---|---|---|
| Fuel Injection System | Mechanical injection pump (P-type) / Inline pump | Highly adaptable to variable fuel qualities in export markets (some regional variants feature CRDI/EUP). |
| Emission Standard | Euro II / National II | Configured for markets without complex exhaust aftertreatment (SCR/DPF) requirements. |
| Engine Oil Capacity | Approx. 23 L – 28 L | Varies depending on whether a flat-bottom or sloped-bottom oil pan is fitted. |
| Optimum Oil Pressure | 350 ~ 550 kPa (at rated speed) | Should not drop below 100 kPa at hot idle. |
| Oil-to-Fuel Consumption Ratio | ≤ 0.2% | Enabled by advanced piston ring sealing and precise oil control. |
| Coolant Capacity | Approx. 20 L (engine block internal circuit only) | Must be filled with heavy-duty anti-freeze and anti-rust coolant. |
| Thermostat Opening Temp. | Opens at 80°C, fully open at 95°C | Ensures the engine warms up quickly to its ideal operating temperature. |
| Auxiliary Braking System | WEVB (Weichai Exhaust Valve Brake) | Improves downhill safety and reduces service brake pad wear. |
Installation Dimensions, Weight & Overhaul Data
| Parameter Item | Specification Data / Description | Remarks |
|---|---|---|
| Dry Weight (Net) | Approx. 905 kg | Excludes engine oil, coolant, and certain external chassis-mounted brackets. |
| Overall Dimensions (L×W×H) | Approx. 1500 mm × 817 mm × 1094 mm | Compact layout for a long-stroke, heavy-duty engine. |
| Overhaul Component Kit Codes | WP12400E201-XLB / WP12-DXB | Standard part numbers for full engine gasket sets and "cylinder rebuild kits" (Piston/Ring/Liner/Pin). |
| Cylinder No. 1 TDC Timing Mark | Flywheel housing inspection hole 0° / Crankshaft front damper | Used for checking fuel injection timing and adjusting valve clearances. |
| Valve Clearance (Cold Engine) | Intake: 0.40 mm / Exhaust: 0.60 mm | Must be adjusted precisely according to these cold clearance values. |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Hot Tags: weichai 400hp engine assembly 11.6-liter, heavy-duty inline-six diesel engine wp12400e201, manufacturers, suppliers, factory, parts, genuine, original
