Details
Weichai 6WH17C750-2 Marine Propulsion Engine (750 HP, 551 kW)
The Weichai 6WH17C750-2 Marine Diesel Engine is a high-performance medium-speed marine propulsion engine developed for demanding commercial marine applications. Delivering 551kW (750HP) at 1200rpm, this engine belongs to the proven Weichai WH17 Series Engine platform and is designed to provide reliable propulsion power for fishing vessels, cargo boats, transport ships, engineering vessels, and workboats operating under continuous heavy-duty conditions.
As a professional Weichai Marine Diesel Engine Supplier, HekoPower supplies complete engine assemblies, replacement engines, overhaul parts, and technical support services for global marine operators. Whether customers are looking for a new propulsion system or replacing an existing marine engine, the Weichai 6WH17C750-2 propulsion engine offers an excellent balance of power output, fuel economy, durability, and lifecycle operating cost.
The engine adopts an electronically controlled high-pressure common rail fuel injection system, allowing precise fuel delivery under varying load conditions. This advanced design improves combustion efficiency, reduces fuel consumption, and enhances engine responsiveness compared with traditional mechanical injection systems.
Tech Specs of Weichai 6WH17C750-2
General Engine Data
Engine Model: Weichai 6WH17C750-2
Cylinder Count: 6 Cylinders in Line
Engine Type: Inline, 4-Stroke, Water-Cooled, Direct Injection
Total Engine Displacement: 30.22 L
Bore * Stroke: 170 mm × 222 mm
Dry Weight (Engine Only): 3500 kg
Overall Dimension: 2355 mm × 1210 mm × 1615 mm
Key Performance Data
Rated Power: 551 kW / 750 HP
Rated Speed: 1200 RPM
Idle Speed: 500 RPM
Minimum fuel consumption rate: 190 g/kW.h
Oil consumption rate: ≤0.3 g/kW·h
More Technical Data
Certification: IMO Tier II / China Stage II Inland Marine
Aspiration: turbocharged and aftercooled
Starting system: Electrical
Rotation(facing the flywheel) : Counter-clockwise
Fuel system: HPCR
Power rating: P1
Comparative Performance Analysis
When designing or repowering a commercial vessel, selecting the right medium-speed propulsion unit is critical. The Weichai 6WH17C750-2 balances mechanical traditional robustness with precise electronic injection control.
Technical Comparison: Weichai 6WH17C750-2 vs. Traditional Mechanical Engines
Older 750 hp marine engines traditionally rely on mechanical inline injection pumps. The Weichai 6WH17C750-2 electronically controlled common rail engine fundamentally alters performance via a closed-loop ECU (Electronic Control Unit) platform.
- Fuel Injection Precision: Mechanical systems rely on engine speed to generate injection pressure, resulting in poor atomization at lower RPMs. The 6WH17C750-2 utilizes a high-pressure common rail fuel system that decouples injection pressure from engine speed. This allows for multi-stage micro-injections, optimizing the combustion profile and reducing cold-start smoke.
- Torque Elasticity: The WH17 series features a newly engineered bleed-valve pulse turbocharger system. At 50% of its rated speed, this high torque marine diesel engine can hit up to 115% of its rated torque. Mechanical legacy engines generally provide a 10% to 15% torque reserve; the 6WH17C750-2 offers a ≥ 25% torque reserve, enabling superior vessel acceleration and draft management under heavy resistance.
- Operational Economy: By refining the piston-bowl geometry and optimizing fluid dynamics within the tangential intake ports, the 6WH17C750-2 lowers fuel consumption down to an efficient ≤ 185 g/kW·h.
Performance Comparison: Weichai 6WH17C750-2 vs. Competitive Medium-Speed Units
Compared directly to other international high-displacement 6-cylinder marine engines in the 550 kW class, the Weichai WH17 series excels across core operating metrics:
- Power-to-Weight Optimization (3,500 kg net mass ensures structural durability without overloading the vessel floor)
- Low Fuel Consumption Performance (Achieved via precise Common Rail multi-injection logic)
- Overhaul Life Cycle Capability (20,000 hours structural design threshold via high-grade graphite cast iron block)
The cylinder block itself is cast using advanced vermicular graphite iron, providing high thermal fatigue resistance and tensile strength. This structural foundation directly enables a marine engine with a 20,000h overhaul interval, outperforming standard gray-iron alternatives that require major component overhauls thousands of hours earlier.
Real-World Application Scenarios
The P1 continuous heavy-duty rating dictates that the Weichai 6WH17C750-2 can run at 100% rated power without time limitations, making it well-suited for high-uptime workboats and commercial vessels.
Fishing Boat and Trawler Operations
For a fishing boat diesel engine (750 hp), operating profiles transition rapidly from high-speed cruising to high-drag, low-speed trawling. When deep-sea trawlers pull heavy nets, the engine experiences severe thermal loading and rapid load spikes. The 6WH17C750-2 handles these conditions effectively:
- Its high low-speed torque ensures the vessel maintains steady trawling speeds without straining the powertrain.
- Its configuration as a diesel engine for fishing vessels translates to consistent fuel savings during extended open-ocean voyages.
Commercial Freight and Transport Ships
In inland water systems and coastal shipping lanes, cargo boats require constant propulsion across changing currents. Operating as a marine engine for cargo boats and diesel engine for transport ships, the 6WH17C750-2 runs smoothly at 1200 rpm, keeping structural hull vibrations to a minimum. Its compact width (1220 mm) allows for twin-engine installations in narrower engine rooms, multiplying total power while maintaining accessibility for maintenance.
Engineering Vessels and Heavy Workboats
Whether driving a cutter-suction dredger, an offshore supply vessel, or a harbor tug, a marine propulsion solution for workboats must tolerate highly variable load factors. The heavy-duty marine propulsion engine structural setup incorporates a specialized three-piston-ring layout paired with a carbon-scraping ring, keeping oil consumption down to ≤ 0.3 g/kW·h while preventing ring stick even during sustained low-load idling.
Maintenance, Lifecycle Management, and Replacement Tips
Maximizing the 20,000-hour design life of your Weichai power plant requires adhering to planned maintenance protocols and using Genuine Weichai marine parts. As an expert Weichai marine engine supplier, HekoPower supports your operations with comprehensive technical guidance.
Essential Preventive Maintenance Schedule
- Daily / Pre-Operation Check: Inspect fluid levels across the primary loops. Monitor the high-pressure fuel pipe leak-off system via the integrated collection sensors.
- Every 250 Operating Hours: Replace the secondary fuel filters and primary lube oil filters. Check the tension on the 24V/11kW electric starter drive belt.
- Every 1,000 Operating Hours: Check and calibrate valve clearances (4 valves per cylinder). Inspect the zinc anodes within the seawater-cooled heat exchanger to prevent galvanic corrosion.
- Every 5,000 Operating Hours: Service the Weichai marine turbocharger. Check the common rail injection pressures via the Weichai marine ECU system diagnostics tool.
Repowering and Engine Replacement Guidelines
If you are executing a Weichai 1200 rpm marine engine replacement for an aging or mechanical propulsion unit, follow these core technical guidelines:
- Foundation Alignment: Ensure the hull's mounting stringers can support the 3,500 kg static dry mass and accommodate the 2355 mm footprint. Use adjustable anti-vibration mounts to isolate the hull.
- Cooling Configuration: The 6WH17C750-2 features a multi-layer fluid heat exchange setup. Verify that the sea-chest intake diameters can supply adequate raw-water flow to match the centrifugal pump's requirements.
- ECU System Integration: When replacing older mechanical engines with this electronically controlled common rail model, install the digital dashboard monitor securely within the wheelhouse. Ensure all CAN-bus connections follow IP55 or higher deck protection protocols.
Critical Part Warning: Avoid using generic components during routine service. Non-OEM filters and internal components can compromise common rail injection pressures, invalidate emissions compliance, and shorten engine life. Always source verified component kits directly from a recognized supplier.
OEM Spare Parts and Component Support from HekoPower
HekoPower maintains a complete inventory of factory-original replacement parts for the Weichai WH17 series, ensuring rapid dispatch to minimize vessel downtime:
- WH17 Cylinder Head Assembly: Features a multi-valve cast configuration designed to optimize swirl ratios and tolerate extreme peak combustion pressures.
- WH17 Piston Liner Kit: Includes wet cylinder liners made from high-strength alloys, matched with precision-machined pistons and a specialized carbon-scraping ring array.
- WH17 Fuel Injector & Common Rail Components: High-pressure injectors designed to deliver precise micro-injections under tight tolerances.
- Weichai Marine ECU System & Sensors: Original factory engine control units pre-mapped with optimal fuel profiles for IMO Tier II compliance.
Weichai 6WH17 series marine diesel engine, original products from Weichai. This series mainly includes 6WH17C650-1, 6WH17C680-2, 6WH17C700-1, 6WH17C718-2, 6WH17C750-2, 6WH17C850-2, 6WH17C900-3, 6WH17C900-5, 6WH17C1000-5, 6WH17C1100-5.
Frequently Asked Questions (FAQs)
What is the exact price of the Weichai 6WH17C750-2 marine propulsion engine?
The price of a Weichai 6WH17C750-2 marine engine varies based on standard variables, including the choice between electric or air starting systems, auxiliary power take-off (PTO) options, required marine classification certificates (such as CCS, BV, ABS), and order volume. For precise Weichai marine engine price quotations and wholesale packages, please contact the HekoPower sales engineering department directly.
Does this engine require specialized low-sulfur fuel to maintain emissions compliance?
The Weichai 6WH17C750-2 is fully compliant with IMO Tier II and China Stage II standards when operating on standard Marine Gas Oil (MGO) or Marine Diesel Oil (MDO). To protect the high-pressure common rail injection system, ensure the fuel meets clear water-separation and particulate filtration standards before entry.
Can the Weichai 6WH17C750-2 be fitted with an air-start fallback option?
Yes. While the standard layout utilizes a dual-pole 24V/11kW electric motor starter system, HekoPower can deliver the engine configured with an auxiliary air-start motor system, providing redundant starting capabilities for specialized commercial or engineering vessels.
What is covered under the standard Weichai marine engine warranty?
Genuine Weichai marine engine assemblies sourced through HekoPower come with comprehensive factory warranty protection covering major structural castings (such as the engine block and crankshaft) along with all critical core ancillaries, backed by our international service and parts distribution network.
