Details
Weichai 6WH17C850-2 Marine Diesel Engine
The Weichai 6WH17C850-2 Marine Diesel Engine is a high-performance medium-speed propulsion engine developed for demanding marine applications. Delivering 850HP (625kW) at 1200rpm, this model belongs to the proven Weichai WH17 Series Marine Engine platform and is widely used in commercial fishing vessels, cargo ships, utility boats, offshore service vessels, and inland transportation fleets.
As a professional marine engine assembly supplier, HekoPower provides genuine Weichai marine engines, complete propulsion packages, replacement parts, and international logistics services for shipowners, shipyards, and marine equipment distributors worldwide.
Tech Specs of Weichai 6WH17C850-2
General Engine Data
Engine Model: Weichai 6WH17C850-2
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: 625 kW / 850 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 Features of the Weichai 6WH17C850-2
Advanced Electronic Common Rail Fuel Injection
Unlike older mechanical fuel systems, the electronic common rail marine diesel engine technology used in the Weichai 6WH17C850-2 enables precise fuel delivery at various operating conditions.
Benefits include:
- Improved fuel atomization
- Lower fuel consumption
- Reduced emissions
- Faster throttle response
- Improved combustion efficiency
This technology helps vessel owners reduce operational expenses while maintaining reliable propulsion performance.
Heavy-Duty Engine Structure
The engine block is designed for long-term continuous-duty marine operation.
Major components include:
- High-strength cylinder block
- Forged steel crankshaft
- Heavy-duty connecting rods
- Efficient cooling system
- Turbocharging and intercooling technology
These features make the engine suitable as a heavy-duty marine engine for commercial vessels operating under challenging marine environments.
Long Overhaul Interval
One of the most attractive features of the engine is its durability.
The marine engine with 20000-hour overhaul interval significantly reduces:
- Maintenance downtime
- Spare parts expenses
- Total ownership costs
For fleet operators, fewer major overhauls translate directly into higher vessel availability and profitability.
Technical Comparisons: Weichai vs. Caterpillar & Cummins
In the international commercial marine market, vessel owners frequently evaluate the Weichai 6WH17C850-2 as a high-value engineering replacement for CAT marine engines (such as the legacy Cat 3406 or early C18 platforms) and an attractive replacement for Cummins marine propulsion engines (such as the KTA19 series).
Understanding the structural deviations between these systems clarifies why the Weichai medium speed marine engine often wins the long-term total cost of ownership (TCO) calculation.
Displace-to-Speed Ratios
Legacy Western alternatives in the 800HP to 850HP power band often rely on high-speed commercial blocks running anywhere between 1800rpm and 2100rpm to extract their rated power. The Weichai 6WH17C850-2, by contrast, operates as a true marine propulsion engine 1200rpm medium-speed block.
By utilizing a vast 30.22L displacement and a prolonged stroke 222 mm), the Weichai engine generates its 850HP easily at lower rotational speeds. Lower speeds inherently translate into reduced friction, lower thermal stress across the internal components, and minimized structural vibration inside the vessel engine room.
Fuel System Flexibility & Emissions Compliance
Older Cummins and CAT mechanical platforms struggle to meet tightening worldwide environmental baselines without extensive, expensive after-treatment alterations. As an IMO II marine diesel engine, the Weichai 6WH17 common rail marine diesel engine precisely modulates its multiple-injection events (including pre-injection and post-injection phases) through an intelligent electronic control unit.
This enables native compliance with Weichai IMO II compliant marine engine parameters while simultaneously flattening the fuel consumption curve across the entire 700rpm to 1200rpm operating spectrum.
Real Application Scenarios: Where the 6WH17C850-2 Excels
The 625kW medium-speed platform is explicitly non-generalized; it is configured for displacement hulls that demand continuous torque under high load resistance.
Heavy-Duty Weichai Marine Engine for Cargo Vessels
For inland river pushers, self-propelled barges, and coastal bulk carriers tracking up to 2,000 deadweight tons (DWT), continuous power delivery is mandatory to combat swift river currents or ocean headwinds.
Operating under a P1 heavy-duty continuous rating, the 6WH17C850-2 can sustain 100% power output indefinitely. Its high torque reserve (exceeding 20-25%) ensures that if the vessel encounters resistance, the engine does not bog down; instead, it maintains propeller RPM efficiently.
Rugged Weichai Marine Engine for Fishing Boats
Deep-sea trawlers and ocean fishing boats subject engines to severe load cycles—cruising rapidly to a fishing ground requires speed, while dragging heavy nets requires raw, low-speed pulling force.
The electronic common rail system adapts instantly to these shifts, optimizing the fuel injection pressure so that even at 50% of its rated speed, the engine can safely extract up to 95% of its peak rated torque.
Maintenance, Lifecycle Management, and Replacement Tips
Every experienced fleet manager knows that the true value of a marine engine assembly is measured by how long it stays out of drydock. The Weichai 6WH17C850-2 is fundamentally optimized for continuous uptime.
The 20,000-Hour Overhaul Threshold
While typical high-speed marine commercial engines demand comprehensive overhauls every 10,000 to 12,000 operating hours, this unit stands out as a robust marine engine with 20000-hour overhaul interval limits. This massive time-between-overhaul (TBO) is achieved through premium metallurgy, including a high-strength vermicular graphite cast iron cylinder block and a specialized steel-backed, multi-layer alloy crankshaft.
Furthermore, the implementation of a internal three-piston-ring layout paired with an integrated scraping carbon ring at the top of the wet cylinder liner strips away carbon buildup before it can score the liner walls, securing long-term compression stability.
Essential Preventive Maintenance Milestones
To maintain valid class certifications (such as CCS or BV) and protect the powertrain lifecycle, HekoPower recommends sticking to a strict maintenance protocol:
- Every 250 to 500 Hours: Perform standard engine lube oil and fuel filter replacements. Thanks to integrated non-stop duplex filter replacement technology, operators can safely isolate and swap out clogged oil filters during active engine operation without shutting down propulsion.
- Every 5,000 Hours: Inspect and calibrate the electronic common rail injectors. Check the tensioning matrix of the peripheral poly V-belt transmission assemblies.
- Every 10,000 Hours: Conduct an intermediate inspection including turbocharger bearing validation, valve clearance adjustments, and endoscopic evaluation of the wet cylinder liners.
Why Choose HekoPower as Your Weichai WH17 Marine Engine Distributor?
Buying a marine engine is never a simple transactional purchase—it is a long-term technical partnership. As an established Weichai marine power solution supplier and direct Weichai marine diesel engine exporter China partner, HekoPower delivers end-to-end propulsion integration.
We do not simply ship an isolated engine block. The marine engineers at HekoPower actively analyze your vessel’s hull schematics to deliver complete propulsion packages. This includes precision matching with advanced marine gearboxes (such as the Advance MB270A or Hangzhou Advance series), custom shafting line design, propeller sizing, and the programming of dual-bridge integrated remote control safety monitors.
From sourcing genuine Weichai 6WH17C850-2 overhaul interval parts to exporting fully certified assemblies worldwide, HekoPower bridges the gap between factory engineering and real-world maritime deployment.
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 Weichai 6WH17C850-2 marine diesel engine price?
Because marine engine installations depend heavily on required classification society certifications (such as CCS, BV, ABS, or RINA), matching gearboxes, and auxiliary configurations (such as standard electric start vs. dual air-and-electric redundant starters), prices vary. Contact the HekoPower wholesale sales desk directly for a transparent, comprehensive project quotation based on your specific operational profile.
Can the Weichai 6WH17C850-2 operate continuously on Marine Gas Oil (MGO)?
Yes. This electronic common rail propulsion system is fully optimized to run on standard Marine Gas Oil (MGO) and Marine Diesel Oil (MDO), maintaining stable viscosity tracking and complete fuel atomization even during prolonged low-speed idling.
Where can I download the formal Weichai 6WH17C850-2 engine specifications PDF?
HekoPower provides comprehensive technical data packages for naval architects and shipyards. Please submit an inquiry through our digital portal referencing your hull dimensions, and our technical support team will instantly supply the official engineering diagrams, performance curves, and PDF documentation.
What is the fuel consumption rate of the Weichai 6WH17C850-2?
The Weichai 6WH17C850-2 fuel consumption rate depends on operating conditions, vessel load, and maintenance status. Under optimized conditions, the electronic common rail system helps achieve highly competitive fuel efficiency compared with conventional marine diesel engines.
Is the engine compliant with IMO emission regulations?
Yes. The engine is an IMO Tier II 625kW marine propulsion engine Weichai solution designed to meet international marine emission requirements.
Can this engine replace older CAT or Cummins marine engines?
In many retrofit projects, the 6WH17C850-2 is selected as a replacement for CAT marine engines and a replacement for Cummins marine propulsion engines due to its competitive pricing, fuel efficiency, and reliable performance.
