Details
Weichai 6WH17C650-1 Marine Diesel Engine Assembly & Propulsion Solutions
The Weichai 6WH17C650-1 Marine Diesel Engine is a high-performance medium-speed marine power solution designed for continuous-duty propulsion applications. Rated at 478kW (650HP) at 1000rpm, this engine combines advanced common rail fuel injection technology, excellent fuel efficiency, and long service life to meet the operational demands of commercial marine fleets worldwide.
As a professional Weichai Marine Engine Supplier, HekoPower provides genuine engine assemblies, replacement parts, maintenance support, and export services for customers operating fishing vessels, cargo boats, tug boats, engineering vessels, and other commercial marine applications.
The Weichai 6WH17 marine engine is developed for reliability in harsh marine environments, delivering stable torque output, low fuel consumption, and compliance with IMO II emission standards.
Tech Specs of Weichai 6WH17C650-1
General Engine Data
Engine Model: Weichai 6WH17C650-1
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: 478 kW / 650 HP
Rated Speed: 1000 RPM
Idle Speed Setting: 500 ± 30 RPM
Minimum Fuel Consumption Rate: ≤185 g/kW·h
Lubricating Oil Consumption Rate: ≤0.3 g/kW·h
More Technical Data
Certification: IMO Tier II / China Stage II Inland Marine
Aspiration: Turbocharged and Intercooled
Compression Radio: 16.5:1
Fuel Injection Architecture: Electronically Controlled High-Pressure Common Rail
Flywheel Housing Interface: SAE 0 / Flywheel 18"
Crankshaft Rotation Vector: Counter-Clockwise (viewed from flywheel end)
The Weichai 6WH17C650-1 Common Rail System
A core highlight of this configuration is the specialized Weichai 6WH17C650-1 common rail system. Moving away from older, rigid mechanical unit pumps, this system relies on an ECU-driven fuel rail that decouples injection pressure from engine RPM.
This means even when your vessel is idling or running at low speeds in heavy seas, the injection pressure remains optimal, drastically reducing soot accumulation and eliminating the typical white or black smoke associated with medium-speed engines. The system continuously adapts injection timing across multiple micro-injections per cycle, maximizing thermal expansion and keeping the Weichai 6WH17C650-1 fuel consumption curve exceptionally flat across 50% to 100% load profiles.
Physical Installation Footprint
When retrofitting a vessel, managing engine room space is critical. The Weichai 6WH17C650-1 engine dimensions (2355 mm length by 1210 mm width) make it remarkably compact for a 30-liter displacement block. The rigid block design limits structural vibration, allowing for simpler foundation bed alignments. Because it uses an integrated plate-type oil cooler and fresh-water heat exchanger directly mounted to the front gear train, the external plumbing footprint is minimized, freeing up valuable space in tight engine rooms.
Technical Comparisons: Mechanical vs. Common Rail
To appreciate the design of this 650HP marine diesel engine, it is valuable to compare it directly against traditional mechanical-injection platforms and older generation 170mm bore engines still found on the secondary market.
Common Rail Efficiency vs. Mechanical Unit Pumps
Traditional mechanical marine engines rely on the engine's camshaft to drive individual injection pumps. At low engine speeds, injection pressure drops, leading to incomplete combustion, carbon buildup on valves, and increased fuel waste.
The advanced Weichai common rail marine engine overcomes this limitation. By maintaining a constant high pressure within the fuel rail, fuel is atomized into a microscopic mist the instant the electronic injector opens. This results in cleaner combustion, a quieter engine room, and an average fuel saving of 6% to 10% when operating under variable mid-range loads.
The Benefits of Medium-Speed 1000 RPM Operations
Many operators face a choice between a high-speed engine running at 1800–2100 RPM and a Weichai 1000 rpm medium speed engine like the 6WH17C650-1. While high-speed options are lighter, they suffer from rapid component wear and require frequent top-end overhauls.
The 6WH17C650-1 operates at a relaxed 1000 RPM. This lower linear piston speed significantly reduces friction heat and structural wear on moving components, extending the engine’s operational life. Consequently, it achieves an exceptionally long Time Between Overhauls (TBO)—up to 20,000 hours—making it the ideal choice for heavy-duty commercial operations.
Real-World Marine Application Scenarios
The 650hp continuous duty marine diesel rating of the 6WH17C650-1 makes it highly versatile. Below are the primary hull types where this specific power configuration delivers optimal economic returns.
Heavy-Duty Engine for Fishing Vessels
Deep-sea trawlers and long-liners require an engine that can handle sudden, drastic changes in load. When deploying or hauling heavy trawl nets, the hull demands massive torque at low speeds. The 6WH17C650-1 features a 25% torque reserve, enabling it to handle sudden resistance without stalling or bogging down. Additionally, its front-end power take-off (PTO) capability can comfortably drive heavy hydraulic pump arrays for winches and onboard refrigeration systems simultaneously.
Primary Propulsion Engine for Coastal Transport Vessels
For coastal cargo carriers and inland river barges, profitability depends on keeping fuel consumption predictable over long journeys. Operating as a marine main propulsion engine, the 6WH17C650-1 allows coastal transport vessels to maintain stable cruising speeds even when fully laden with bulk cargo. Its strict compliance as an IMO II marine diesel engine also ensures seamless entry into international ports and environmentally regulated waterways without the risk of compliance penalties.
Reliable Marine Engine for Workboats and Tug Boats
Harbor tugs and push-boats demand exceptional maneuverability and high bollard pull. The low rated speed of this medium speed marine propulsion engine allows it to pair efficiently with large-diameter, high-pitch propellers via heavy-reduction marine gearboxes (such as Advance or Twin Disc units). This setup delivers maximum hydrodynamic thrust exactly when pushing or towing large ships, providing captains with the instant, predictable power needed for precise harbor maneuvers.
Maintenance, Lifecycle Management & Genuine Spare Parts
Every commercial operator knows that a marine engine is only as good as the supply chain supporting it. As an experienced genuine Weichai marine engine exporter, HekoPower ensures you have access to both expert service knowledge and authentic factory components to protect your investment.
Critical Preventative Maintenance Milestones
To maximize the working life of your 6WH17C650-1 and protect your warranty, follow these factory-recommended maintenance intervals:
- Every 250 Operating Hours: Inspect and clean the primary sea-water strainers. Check the tension of the front end auxiliary drive belts. Sample the engine oil to check for any fuel dilution from the high-pressure system.
- Every 500 Operating Hours: Replace the engine oil and the dual spin-on lube oil filters. Replace the primary and secondary fuel filter elements. Clean the air filter housing and inspect the turbocharger compressor wheel for salt crusting.
- Every 1500 Operating Hours: Inspect and adjust intake and exhaust valve clearances. Check the common-rail injector line connections for micro-fractures. Inspect the zinc sacrificial anodes within the raw-water heat exchanger loop and replace them if more than 50% consumed.
- Every 5000 Operating Hours: Perform a top-end inspection. Inspect the valve guides, test the pressure profile of the turbocharger wastegate, and run diagnostic calibrations on the engine control unit (ECU).
Essential Overhaul Components & Support
When the engine approaches its major service interval, using cheap imitation parts can lead to catastrophic failure at sea. HekoPower is a specialized Weichai engine cylinder liner supplier and stocks complete, factory-certified overhaul kits.
When rebuilding your engine, it is critical to replace worn components with a genuine Weichai marine engine overhaul kit. Our kits include matching piston assemblies with graphite-coated skirts, high-alloy valve seats, and precisely honed cylinder liners designed to handle the high combustion pressures of the common-rail cycle. Utilizing these Weichai marine engine maintenance parts ensures your engine is restored to original factory specifications, preserving its fuel efficiency and reliability for its next multi-thousand-hour operating cycle.
Complete Marine Propulsion System Integration
HekoPower does not simply ship an engine in a crate; we deliver a fully integrated Weichai 6WH17 marine propulsion solution. Our engineering team helps design and optimize the entire drivetrain from the flywheel back.
- Power Matching Analysis: We evaluate your vessel’s waterplane data, displacement, and desired service speed to determine the ideal reduction gear ratio.
- Torsional Vibration Calculations (TVC): To prevent premature shaft breakage or bearing wear, we assist in selecting the correct flexible coupling to isolate vibrations between the engine and the gearbox.
- Control System Setup: We supply integrated bridge control stations, complete with electronic throttles, multi-function digital displays, and secondary mechanical override controls to ensure full command of the vessel under all conditions.
Secure Your Propulsion Solution with HekoPower
Choosing the right main engine is one of the most critical decisions for the lifetime profitability of your vessel. With the Weichai 6WH17C650-1 Marine Diesel Engine, you gain a durable, highly efficient, and modern propulsion system designed to lower your operational costs.
Whether you are looking to buy a Weichai 6WH17C650-1 marine engine or need a complete powertrain consultation, the engineering team at HekoPower is ready to assist. Contact us today to receive detailed technical drawings, performance curves, and direct pricing for your upcoming marine project.
Weichai 6WH17 series marine diesel engine, original products from Weichai. This series mainly includes
Frequently Asked Questions (FAQs)
What is the exact price of the Weichai 6WH17C650-1 engine?
The Weichai 6WH17C650-1 price depends on your required configuration, including classification society certifications (such as CCS, BV, ABS, or GL), choice of cooling configuration (keel cooled vs. heat exchanger), and any matching marine gearbox options. As a factory-direct Weichai marine diesel engine supplier in China, HekoPower provides competitive commercial pricing. Contact our sales engineering team today for a detailed, itemized quote tailored to your project requirements.
Can this engine be run on low-sulfur marine gas oil (MGO)?
Yes, the IMO Tier II Weichai 6 cylinder engine is fully compatible with standard marine gas oil (MGO) and marine diesel oil (MDO). The high-pressure common-rail fuel system features specialized coatings on the injector needles and pump plungers to ensure excellent lubrication and wear resistance, even when running on ultra-low sulfur eco-fuels.
What classifications certificates are available for the 6WH17 series?
As an international Weichai marine engine supplier, we can deliver the engine assembly certified by major global maritime classification societies. These include the China Classification Society (CCS), Bureau Veritas (BV), and American Bureau of Shipping (ABS). Please specify your required certification framework during the initial inquiry stage so we can ensure full compliance during factory testing.
How does HekoPower handle international service support?
HekoPower offers comprehensive Weichai marine engine service support worldwide. Every engine assembly we export is backed by Weichai’s global service network, complemented by HekoPower’s remote technical assistance. If your vessel operates in remote regions, we can configure a custom on-board spare parts package—including critical sensors, fuel filters, gaskets, and an extra injector assembly—ensuring your crew has everything needed to perform essential repairs and maintain uptime at sea.
