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Weichai 6WH17C900-5 Marine Diesel Engine: The Ultimate 900HP Propulsion Guide
The Weichai 6WH17C900-5 Marine Diesel Engine is a high-performance medium speed marine propulsion engine developed for commercial marine operators seeking reliable power, fuel efficiency, and long service life. Delivering 661kW (900HP) at 1500rpm, this engine belongs to the proven 6WH17 series Weichai engine family and is widely used in fishing vessels, coastal cargo ships, passenger ferries, patrol boats, and various workboat applications.
Featuring advanced common rail fuel injection technology, optimized combustion control, and a robust structural design, the Weichai 900HP marine engine provides outstanding operational efficiency while meeting IMO II marine emission requirements. As a professional marine engine supplier, Heko Power supplies genuine Weichai engines, spare parts, technical support, and export services for customers worldwide.
Tech Specs of Weichai 6WH17C900-5
General Engine Data
Engine Model: Weichai 6WH17C900-5
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: 661 kW / 900 HP
Rated Speed: 1500 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 Deep-Dive: Architecture and Variant Comparison
Choosing the correct machine layout requires a clear understanding of configuration variants. Within the broader Weichai WH17 series engine ecosystem, specific sub-models cater to different operational profiles.
6WH17C900-5 vs. 6WH17C900-3: The 1500 RPM Advantage
A common point of confusion when buyers look to buy Weichai 6WH17C900-5 marine engine systems is how it differs from the -3 variant. While both engines generate identical power output (661kW / 900HP), their internal speed calibrations change their operational profiles entirely:
- The 6WH17C900-3 variant hits its 900HP peak at a lower 1350 RPM. This configuration maximizes raw torque at lower shaft speeds, making it excellent for heavy, deep-draft displacement vessels like tugs and heavy cargo barges pulling massive resistances.
- The 6WH17C900-5 variant achieves its 900HP rating at 1500 RPM. This higher rated speed makes the engine highly versatile. It aligns perfectly with higher-pitch propeller curves found on faster hulls, and matches standard 1500rpm marine engine requirements for electrical generation (50Hz marine gensets).
Common Rail vs. Mechanical Injection Performance
The core driver behind the Weichai 661kW marine propulsion engine's dominance is its standard high-pressure common rail fuel system.
Traditional mechanical injection systems rely on engine speed to generate injection pressure. This results in poor fuel atomization and smoke generation at lower RPM ranges. In contrast, the Weichai common rail marine engine maintains an incredibly high fuel rail pressure independent of engine RPM. Controlled by an advanced electronic control unit (ECU), fuel is atomized into micro-droplets and delivered via multi-stage injection.
This technical approach directly lowers the Weichai 6WH17 fuel consumption rate to a low 185 g/kW·h at peak efficiency. It also significantly dampens combustion noise and ensures full compliance with IMO Tier II Weichai 661kW engine emissions regulations without requiring bulky exhaust after-treatment.
Operational Scenarios: Where the 6WH17C900-5 Excels
The 1500 RPM power curve makes this medium speed marine diesel engine exceptionally versatile across multiple hull profiles.
Industrial Fishing and Trawling Fleets
For deep-sea fishing operators, a Weichai engine for fishing vessels must handle two completely distinct operational modes: running quickly to the fishing grounds at full speed, and low-speed trawling with massive net drags. The 6WH17C900-5 features a 25% torque reserve. This means that when nets are dropped and mechanical resistance spikes, the pulse turbocharging layout responds instantly, avoiding engine bogging or structural thermal overload.
Passenger Ferries and Coastal Patrol Craft
Safety, speed consistency, and low vibration are crucial when configuring a Weichai engine for passenger ferries or a Weichai engine for patrol boats. The FEV-optimized engine block utilizes an in-line 6-cylinder layout with vermicular graphite cast iron, which inherently dampens secondary engine vibrations. This creates a quieter environment for passengers and crew while extending the structural lifespan of surrounding onboard electronics and hull welds.
Cargo Barges and Inland Water Transport
In rivers, canals, and shallow coastal waterways, the inland water transport diesel engine 661kW configuration offers the perfect balance of power-to-weight ratio. With total dry dimensions of 2355 mm in length and a net weight of 3500 kg, it drops easily into compact engine rooms without sacrificing the displacement power required to push heavy payloads against strong currents.
Maintenance Guide & Fleet Replacement Protocols
Achieving the rated 20,000-hour Time Between Overhauls (TBO) requires a disciplined approach to maintenance. As a premium genuine Weichai 6WH17C900-5 supplier, HekoPower recommends the following fleet engineering protocols.
Critical Preventative Maintenance Schedules
- Every 250 Hours: Perform standard engine oil and fuel filter element replacements. The 6WH17C900-5 features a specialized switchable dual-filter configuration. This allow ship engineers to switch over to a fresh filter element while the engine is actively running, preventing power loss or vessel downtime during critical voyages.
- Every 1,500 Hours: Inspect and clear the heat exchanger cores. Marine growth and scale accumulation reduce cooling efficiency, which can lead to premature wear on the 170mm cylinder liners.
- Every 6,000 Hours: Calibrate the high-pressure common rail injectors and evaluate rail pressure sensors via the ECU diagnostic interface to ensure optimal fuel atomization.
Retrofit and Repower Blueprint
When sourcing a replacement engine for 900hp fishing boat Weichai or workboat upgrades, mechanical compatibility extends far beyond simple horsepower matching. Fleet engineers must verify three primary interface dimensions:
- Flywheel and Housing Layout: The 6WH17C900-5 generally utilizes a standard SAE 0 flywheel housing configuration with an SAE 18 flywheel setup. Ensure your existing marine gearbox input shaft matches this layout exactly.
- Cooling Circuit Integration: This model utilizes a dual-loop liquid cooling system (freshwater keel-cooling or seawater-heat exchanger). Ensure your sea-chest intake piping can support a minimum water flow rate matching Weichai's raw water pump capacity.
- Exhaust Backpressure Limits: The pulse turbocharger configuration is highly sensitive to exhaust backpressure. Ensure that the shipyard's replacement exhaust ducting layout does not exceed 5 kPa of total restriction, or turbocharger life will drop significantly.
Procurement and Global Logistics Support
When looking for a Weichai 900HP diesel engine for sale, dealing with a specialized Weichai marine engine exporter like HekoPower streamlines the importing process. We manage everything from custom maritime packaging to full classification society certifications.
- Tailored Engineering Support: We assist your shipyard engineers with matching gearboxes (Advance, Twin Disc, or ZF options), calculating torsional vibration characteristics, and designing custom engine mounts.
- Global Spare Parts Security: Purchasing through HekoPower ensures access to genuine replacement parts, including injection pumps, cylinder heads, liners, and filters, keeping your fleet operational worldwide.
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 (FAQ)
What is the exact fuel and oil consumption of the Weichai 6WH17C900-5?
The engine features a minimum rated fuel consumption of 185 g/kW·h under ideal test conditions. Thanks to an innovative three-piston-ring layout paired with a carbon-scraping ring on the cylinder liner, engine oil consumption is held to ≤0.3 g/kW·h, minimizing operational costs over long voyages.
Is the 6WH17C900-5 certified for global maritime use?
Yes. The engine is fully certified to IMO Tier II and China Stage II marine emission regulations. HekoPower provides comprehensive certification options through major global classification societies, including CCS (China Classification Society), BV (Bureau Veritas), and ABS (American Bureau of Shipping) depending on your project needs.
How can I verify that I am buying a Genuine Weichai Marine Engine?
Every authentic Weichai engine features an engraved, anti-counterfeit data plate detailing the engine serial number, build date, and model code. As an authorized genuine Weichai 6WH17C900-5 supplier, HekoPower supplies all engines with factory-original quality certificates, testing logs, and matching ECU software decryption codes.
What is included in the Weichai 6WH17C900-5 specifications PDF?
Our official technical documentation includes full external dimensional engineering drawings, engine performance curves (torque/power/fuel vs. RPM), electrical wiring schematics for the digital helm control panel, and detailed auxiliary system interface guidelines.
