Details
Weichai 6WH17C718-2 Marine Propulsion Power System: The Premium Medium-Speed Alternative for Commercial Fleets
The Weichai 6WH17C718-2 Marine Diesel Engine is a high-performance medium-speed marine propulsion engine developed for commercial marine applications requiring excellent reliability, fuel efficiency, and continuous-duty operation. Delivering 718 HP (528 kW) at 1200 RPM, this engine is part of the proven Weichai WH17 series propulsion engine platform, which incorporates advanced electronic control technology and marine-specific engineering solutions.
As a professional engine supplier, HekoPower provides genuine Weichai 6WH17C718-2 engine assemblies, marine propulsion power system solutions, spare parts support, and international logistics services for shipbuilders, fleet operators, marine engineering contractors, and vessel owners worldwide.
Tech Specs of Weichai Weichai 6WH17C718-2
General Engine Data
Engine Model: Weichai 6WH17C718-2
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: 528 kW / 718 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
Technical Benchmarking & Comparative Engineering Analysis
When fleet superintendents, naval architects, and vessel operators evaluate main propulsion units, they often default to high-speed alternatives like the Weichai WP13C or comparable mechanical commercial engines. However, looking closely at the engineering details reveals why the Weichai WH17 Marine Engine series is the superior economic choice for heavy commercial work profiles.
Architectural Core Differences
The most critical asset of the 6WH17C718-2 is its 30.22-liter total displacement split across an inline-6 configuration. To put this in perspective, high-speed 700HP engines typically rely on smaller 13-to-15-liter blocks running at high speeds between 1800 and 2100 RPM to achieve similar power numbers.
By using a massive 170 mm bore and 222 mm stroke, the 6WH17C718-2 hits its 528kW output at just 1200 RPM. This low-stress operation yields immediate technical advantages:
- Lower Piston Speeds: Drastically reduces frictional wear across the cylinder walls, crankshaft journals, and main bearings.
- Superior Thermal Dissipation: The larger mass avoids localized heat spikes, preventing thermal stress fractures in the cylinder heads.
- Massive Rotational Inertia: Seamlessly absorbs sudden torque spikes caused by rough seas or fouled propellers, protecting the internal drivetrain.
Fuel Delivery and Injection Innovation
Unlike older mechanical designs that use fixed-timing inline injection pumps, the 6WH17C718-2 features an advanced Weichai Electronic Common Rail Marine Engine configuration. This system runs on an independent Weichai ECU, controlling a high-pressure common rail array capable of hitting up to 2200 bar injection pressure.
This ultra-fine fuel atomization creates an efficient burn profile, keeping fuel consumption at a remarkably low ≤185g/kW·h. Multi-stage injection profiles (including pre- and post-injection pulses) also reduce structural combustion noise and vibration by 20%, ensuring a safer and more comfortable environment for crew members working near the engine casing.
Real-World Commercial Application Scenarios
The 6WH17C718-2 is engineered to excel in application environments defined by continuous, variable load profiles, where engine failure directly impacts crew safety and corporate profitability.
Deep-Sea Trawler and Fishing Vessel Operations
In the commercial fishing sector, a Weichai Fishing Boat Engine must perform two completely different tasks. First, it must provide high-speed transit to reach fishing grounds quickly. Second, it needs to transition into high-torque towing profiles when dragging heavy, fully laden nets across the ocean floor.
The 6WH17C718-2 features an advanced bleed valve turbocharger and a pulse supercharging system that gives it an impressive 25% torque reserve.
Low-Speed Torque Performance: When a trawler drops its speed to handle nets, the engine can drop down to 50% of its rated speed while still outputting up to 115% of its rated torque. This prevents engine lugging and exhaust temperature spikes, making it an excellent marine diesel engine choice for demanding trawler boats.
Coastal Transport Vessels and Bulk Carriers
For short-sea bulk carriers shipping heavy aggregate, steel, or agricultural goods, profit margins depend heavily on fuel efficiency and keeping the boat moving. The 6WH17C718-2 diesel engine for bulk carriers gives transport operators a reliable P1 heavy-duty power rating. This means the engine can run continuously at 100% load without any time or power limits.
Its fuel injection timing maps perfectly to regional cruising speeds, letting a medium speed diesel engine for coastal vessels cut thousands of dollars from monthly fuel bills compared to less efficient engines.
Heavy-Duty Tugboats and Maritime Engineering Ships
Harbor tugs and marine construction barges need instant power response and maximum durability. Operating a high torque marine diesel engine for tugboats (528kW) means having the structural support of a cylinder block cast from high-strength Vermicular Graphite Cast Iron.
This advanced material withstands the high explosion pressures generated within the common rail cylinders. Combined with a rugged steel crankshaft and a dual-loop freshwater/seawater cooling circuit, this platform handles the harsh thermal cycling of push-pull operations on engineering ships and workboats.
Maintenance Protocols, Lifespan Extension & Genuine Spare Parts
The foundational engineering goal of the WH17 platform is long-term reliability. Built inside a dust-free, constant-temperature Weichai production facility, every structural assembly is engineered to hit a Weichai marine engine 20,000 hours overhaul time—provided operators follow proper maintenance schedules and use genuine components.
Preventing Common Rail Fuel System Contamination
The high-pressure electronic common rail system uses tight tolerances inside the Weichai injector for 6WH17 engine assemblies. Poor fuel quality or water contamination is the leading cause of premature component wear.
HekoPower recommends installing a multi-stage water separator alongside the engine's switchable dual fuel filters. This setup lets engineers swap out filter elements safely while the engine is running, keeping the fuel lines clean during long voyages.
Piston Ring and Cylinder Liner Management
To keep oil consumption low at ≤0.3g/kW·h, the 6WH17C718-2 relies on a specialized three-piston-ring assembly paired with an integrated carbon-scraping ring at the top of the wet cylinder liner.
During routine maintenance breaks, engineers should check the oil consumption rate. If oil usage spikes without an external leak, it often means carbon is building up on the top ring. Cleaning this early protects the wet cylinder liner from glazing and maintains proper engine compression.
HekoPower Supply Guarantee for Genuine Parts
As a comprehensive maritime partner, HekoPower maintains an expansive inventory of factory-certified parts to support your engine through its entire working life. We ship parts globally to keep your fleet running smoothly:
- Routine Maintenance Kits: High-efficiency air filters, switchable oil filter cartridges, and zinc anodes for sea-water heat exchangers.
- Fuel System Support: Replacement common rail high-pressure pumps, factory-calibrated fuel injectors, and armored double-layer explosion-proof fuel lines with integrated leak alarms.
- Weichai Marine Diesel Engine Overhaul Kit: Complete kits including fresh cylinder liners, vermicular iron pistons, main bearing shells, and specialized cylinder head gaskets to streamline your 20,000-hour overhaul.
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 are the main benefits of choosing the Weichai 6WH17C718-2 over a high-speed engine of the same horsepower?
The 6WH17C718-2 is a true medium-speed commercial engine (1200 RPM). It features a much larger 30.22L displacement compared to high-speed alternatives that typically sit around 13L. This larger footprint lets the engine run at lower speeds with less internal stress and mechanical wear. This structural advantage gives it a massive 20,000-hour overhaul interval, making it far more reliable than high-speed engines for heavy continuous work like towing or commercial fishing.
Does this engine meet international maritime emission regulations?
Yes, it is fully Weichai marine engine IMO II compliant (and meets China Stage II Marine standards). The combination of the electronic common rail injection system and optimized combustion bowls helps it comfortably meet international NOx emission limits without needing complex post-treatment exhaust systems.
Can HekoPower supply a complete marine propulsion power system instead of just the bare engine block?
Absolutely. As an experienced marine main engine Weichai supplier, HekoPower designs and configures complete, integrated powertrain systems. We match the 6WH17C718-2 engine with properly geared marine gearboxes (such as Advance or Twin Disc brands), tailored propulsion shafts, custom-pitched propellers, and local or remote LCD monitoring control panels.
What is the expected delivery timeline and wholesale price for a 6WH17C718-2 engine assembly?
Because 6WH17C718-2 price quotes depend heavily on your specific classification society certificates (such as CCS, BV, ABS, or LR) and any extra propulsion accessories you need, we provide customized pricing for every project. HekoPower holds priority wholesale allocations with the factory, ensuring short lead times and highly competitive commercial pricing for global shipments.
How does the electronic common rail system handle lower-quality marine diesel fuel?
The system features switchable dual fine-mesh fuel filters and high-strength, double-layer explosion-proof fuel piping with built-in leak monitoring. For vessels operating in areas with variable fuel quality, HekoPower recommends installing a dedicated primary centrifugal water-separator filtration unit ahead of the engine to protect the high-pressure common rail components.
