Details
Weichai 6WH17C680-2 Marine Diesel Engine Assembly: The Definitive Commercial Propulsion Solution
The Weichai 6WH17C680-2 is an advanced, inline 6-cylinder medium speed engine that represents the cutting edge of industrial maritime engineering. Developed through a strategic design partnership between the Weichai Group and FEV Germany, this 30.22-liter displacement power plant is engineered to meet the unrelenting demands of continuous, heavy-load maritime operations. Delivering a rated power of 680HP (500kW) at 1200 RPM, this model is built precisely for heavy-duty commercial propulsion applications.
As an authorized, global Weichai marine engine supplier, exporter, and wholesaler, HekoPower maintains a steady inventory of the genuine Weichai 6WH17 engine assembly alongside a comprehensive catalog of authentic maintenance components. Our engineering-focused approach ensures that shipyard operators, vessel owners, and fleet managers receive not only a factory-certified propulsion block but a complete, optimized powertrain system backed by professional technical consultation.
Tech Specs of Weichai 6WH17C680-2
General Engine Data
Engine Model: Weichai 6WH17C680-2
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: 500 kW / 680 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 Architectural Comparison
When assessing power options for a commercial fleet, understanding specific design advantages is critical. The Weichai 6WH17C680-2 marine engine stands apart from both domestic alternatives and legacy Weichai architectures through its high explosion pressure capability (170 bar) and a series of core thermodynamic advancements.
Weichai 6WH17C680-2 vs. Older Generation 6170ZC Series
While the venerable Weichai 6170 series served the commercial maritime sector well for generations, the Weichai WH17 medium speed engine is a completely reimagined modular platform.
- Fuel Injection System Architecture: The older 6170 architectures rely on traditional mechanical inline fuel pumps, which lack precision timing and lead to incomplete combustion at lower speeds. The newer 6WH17C680-2 uses an electronically controlled common rail fuel system. By maintaining injection pressures independent of engine speed, it drastically reduces smoke, achieves a minimum fuel consumption rate of ≤ 185 g/kW·h, and complies fully with IMO Tier II marine diesel engine standards.
- Structural Mechanics and Piston Design: The stroke of the WH17 platform has been extended to 222 mm compared to the 200 mm profile of the 6170, increasing total displacement to 30.22 L. Furthermore, the 6WH17C680-2 uses a high-strength vermicular graphite cast iron cylinder block and a steel crankshaft. It incorporates an advanced three-piston-ring layout paired with a specialized carbon-scraping ring, reducing oil consumption to a lean ≤ 0.3 g/kW·h.
Weichai 6WH17C680-2 vs. High-Speed 13-Liter Class Engines (WP13C)
Fleet managers often debate between using scaled-up high-speed automotive blocks or purpose-built medium speed blocks for mid-sized commercial hulls.
- Duty Cycle and Torque Reserves: A typical high-speed 13-liter engine running at 1800–2100 RPM can achieve high peak horsepower but does so under immense thermal stress, limiting its un-interrupted runtime. The 6WH17C680-2 is a true medium-speed unit calibrated to a conservative 1200 RPM with a P1 continuous power rating (unlimited running hours under 100% load).
- Transient Load Recovery: Backed by a newly engineered bleed-valve pulse turbocharger system, this engine features a massive 25% torque reserve. At just 50% of its rated speed (600 RPM), it can rapidly reach 115% of its rated torque. This low-end lugging power is mathematically unavailable in small-displacement, high-speed blocks.
Real-World Maritime Application Scenarios
The architectural parameters of the 6WH17C680-2 translate directly into operational stability across three primary heavy-duty vessel categories.
High-Endurance Fishing Vessels
For commercial ocean-going trawlers and purse seiners, an engine is more than propulsion—it is a survival mechanism. The Weichai marine engine for fishing vessel configurations excels because its 1200 RPM matching allows the ship to maintain steady, high-tractive dragging power while towing heavy nets through adverse swells. The integrated Voyage Safeguard Monitor stands up to harsh salt-air corrosion, while the specialized engine control unit (ECU) features an emergency "Stormy Wave Mode" that overrides secondary fault shut-downs to prioritize hull control over standard sensor parameter limits during extreme storms.
Heavy-Duty Tug Boats and Harbor Workboats
A Weichai marine engine for tug boat applications must withstand instantaneous, severe load fluctuations without choking on fuel or stalling out. When a tug engages the towline of a deadweight cargo barge, the engine moves from idle to full load in moments. The 6WH17C680-2 handles this via its FEV-engineered tangential air ports and eccentric combustion chamber chamfers, which induce optimal air-fuel swirling. The result is rapid turbocharger spooling, zero soot-blindness on the water, and steady bollard pull.
River Cargo Barges and Inland Water Workboats
For a Weichai marine engine for workboat duties on major inland shipping lanes, long-term operational costs override raw speed. Navigating upriver against high currents demands unyielding, continuous output for days on end. Because the WH17 platform is built for a proven 20,000-hour overhaul cycle, single-vessel operators can log years of dependable revenue generation before scheduling an engine pull.
Proactive Maintenance Lifecycle & Spare Parts Kit Setup
To protect your investment and eliminate costly unexpected downtime, HekoPower provides complete Weichai marine engine maintenance kit packages along with individual genuine Weichai marine engine components.
Essential Onboard Emergency Spares
We advise all commercial vessels to carry a standardized "Voyage Preservation Kit" in their engine rooms, consisting of the following factory-certified components:
- Weichai Cylinder Head for 6WH17 Assembly Seals: High-temperature O-rings and premium multi-layer steel (MLS) head gaskets to maintain integrity under extreme 170 bar internal explosion dynamics.
- Common Rail High-Pressure Fuel Feed Elements: A minimum of two spare fuel injectors and a complete set of anti-explosion, dual-layer high-pressure fuel pipes with built-in leak-off indicator monitors.
- Switchable Filtration Components: Replacement element kits for both primary oil lines and the switchable fuel fine filters, allowing operators to safely hot-swap a clogged filter element during live operation without dropping engine speed.
Scheduled Technical Maintenance Interval Schedule
- Every 250 Hours: [Change Oil & Primary Filters] ---> [Inspect Dual-Wall Fuel Lines]
- Every 1,000 Hours: [Calibrate Valve Clearances]
- Every 5,000 Hours: [Bench-Test Common Rail Injectors] ---> [Inspect Bleed-Valve Supercharger]
- At 20,000 Hours: [Complete System Overhaul]
HekoPower maintains high-volume Weichai marine engine stock available and ready for rapid international transport. Our dedicated logistics team coordinates secure ocean freight routing, export documentation, and customs clearance to minimize lead times for international shipyards.
Whether you need a single unit to repower an active fishing hull or are seeking a long-term supply contract for a commercial shipbuilding program, our team delivers competitive factory-direct wholesale pricing alongside deep technical support. Contact our sales department today for a formal quotation, a complete technical schematic file, or to verify our current inventory allocation status.
Weichai 6WH17 series marine diesel engine, original products from Weichai. This series mainly includes
Frequently Asked Questions
What is included in a "New Weichai 6WH17C680-2 for Sale" engine assembly from HekoPower?
Our complete Weichai marine diesel engine assembly includes the core vermicular iron cylinder block, steel crankshaft, complete common-rail fuel system with dual-walled piping, a bleed-valve turbocharger, air intercooler, freshwater-to-seawater heat exchanger system, 24V electrical starter motor, and the digital Voyage Safeguard monitoring dash panel.
Is the Weichai 6WH17C680-2 engine compliant with local environmental standards?
Yes. The engine is fully certified as an IMO II marine diesel engine and also complies with China Stage II inland waterway emission rules. The precise mapping of its high-pressure fuel injection allows it to maintain these low emission metrics without requiring bulky or expensive selective catalytic reduction (SCR) exhaust after-treatment devices.
How does HekoPower manage the supply of original Weichai marine engine overhaul parts?
As an established Weichai marine engine dealer and wholesale exporter, HekoPower holds extensive physical inventories of internal engine wear parts. We supply everything from complete piston kits (including carbon-scraping rings), wet-type cylinder liners, and main crankshaft bearings to complete top-end gaskets. All parts ship with original factory tracking tags to guarantee authenticity.
Why does the 6WH17C680-2 price vary between quotes on the web?
Many online marketplace quotes originate from unregulated secondary agents or display stripped-down configurations lacking critical marine classification certifications (such as CCS or BV). When you buy from an authorized Weichai marine engine wholesaler like HekoPower, your quote reflects an authentic, fully marinized marine propulsion unit complete with high-end safety accessories, formal factory warranties, and matching technical documentation.
