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Weichai 8170ZC900-5 Marine Diesel Engine: Heavy-Duty 900HP Fleet Propulsion
Navigating harsh marine environments requires an uncompromised balance of steady torque, physical thermal resilience, and simple mechanical dependability. The Weichai 8170ZC900-5 marine diesel engine represents the absolute peak of the venerable Weichai 170 series platform. As a dedicated commercial marine engine supplier, HekoPower provides this 8-cylinder, in-line, four-stroke power plant to fleet owners who cannot afford unscheduled downtime.
Engineered with a 170mm cylinder bore and a 200mm piston stroke, this 36.32-liter displacement giant delivers a rated output of 661kW (900 Horsepower) at 1500 RPM. It complies fully with IMO Tier II environmental regulations, making it a globally viable choice for severe-duty applications. Whether you are refitting an inland cargo vessel or commissioning a new coastal fishing trawler, this propulsion engine offers the predictable mechanical footprint required for modern maritime commerce.
Tech Specs of Weichai 8170ZC900-5
General Engine Data
Engine Model: Weichai 8170ZC900-5
Cylinder Count: 6 / 8 Cylinders in Line
Engine Type: 4-stroke, water cooled, in-line, turbocharged and aftercooled
Total Engine Displacement: 27.24 L / 36.32 L
Bore * Stroke: 170×200 (mm)
Dimensions L×W×H) / net weight: L6 2463×1200×1650 (mm) / 3100kg; L8 2650×1040×1818 (mm) / 3800kg
Key Performance Data
Rated Power: 661 kW / 900 HP
Rated Speed: 1500 RPM
Idle Speed: 450-650 RPM
Minimum fuel consumption rate: 197 g/kW.h
Oil consumption rate: ≤0.5 g/kW.h
Torque reserve: 20-34%
More Technical Data
Certification: IMO Tier II
Aspiration: turbocharged and aftercooled
Starting system: Gas/Electrical
Rotation(facing the flywheel) : Counter-clockwise
Fuel system: Mechanical pump
Power rating: P1
Noise: ≤105 dB(A)
Technical Engineering Profiles: Deciding Between the 1500 RPM and 1350 RPM Configurations
Selecting the correct propulsion profile dictates your vessel's operational efficiency for the next decade. Within the Weichai 170 platform, fleet operators often weigh the merits of the 8170ZC900-5 against its lower-speed sibling, the 900-3 variant. Understanding the nuanced mechanical divergence between these two systems prevents costly hull-matching mistakes.
Rotational Velocity and Hull Matching Strategy
The 8170ZC900-5 achieves its full 900HP capacity at 1500 RPM. This higher rated speed alters the mean effective pressure inside the cylinders, spreading thermal loads across more power strokes per minute. Conversely, the 900-3 variant hits the same 900HP mark at 1350 RPM.
For vessels that rely on a direct mechanical drive or light reduction gearboxes, the 1500 RPM specification of the 900-5 minimizes the required physical size of the flywheel assembly. It provides an exceptional torque curve that aligns cleanly with medium-speed propellers, minimizing structural hull vibration during rapid acceleration phases.
Gearbox Synchronization and Shafting Vibrations
When pairing the 8170ZC900-5 with standard marine gearboxes like the Advance MB170 or Hangzhou mass-transit series, the 1500 RPM input velocity is ideal. It matches standard input ratios perfectly, allowing shipyards to source off-the-shelf running gear.
The higher input speed allows the torsional vibration damper at the front end of the crankshaft to cancel out harmonic frequencies more effectively. This protects the tail shaft and propeller blades from fatigue cracks caused by engine resonance.
Application Profiles: Where the Weichai 8170ZC900-5 Claims Dominance
Every commercial hull demands a specific power delivery profile. The structural engineering of the Weichai 8170ZC900-5 makes it exceptionally suited for continuous, unyielding workloads where stopping is not an option.
Coastal Tugs and Harbor Workboats
Tugboats operate under a duty cycle characterized by sudden load spikes and long periods of high-torque towing. The gantry-style cylinder block of this engine prevents structural flexing when transitioning from zero load to maximum bollard pull. The single-cylinder, single-head structural architecture allows the engine block to handle sudden thermal expansions without blowing the main cylinder head gaskets.
Deep-Sea Fishing Trawlers
Commercial fishing hulls require an engine that can power large hydraulic net winches while maintaining steady propulsion speeds through rough swells. The mechanical or electronic governor on the Weichai 8170 series responds immediately to fluctuating propeller resistance caused by changing sea states. Furthermore, the 3800 kg dry weight provides a solid, low center of gravity that improves overall vessel stability in heavy weather.
Inland Cargo Barges and River Transports
For long-distance river freight, fuel efficiency over thousands of miles is what drives profitability. The 8170ZC900-5 features an optimized pulse turbocharging system that maximizes air intake density. This ensures complete fuel atomization within the combustion chamber, maintaining a highly economical fuel burn rate across the entire P1 continuous duty cycle.
Operational Lifespan and Preventive Maintenance Guidelines
Achieving the legendary 20,000-hour overhaul lifespan of the Weichai 170 series requires a strict adherence to component maintenance intervals. Marine environments accelerate component wear through salt crystallization and constant moisture exposure.
Managing the Centrifugal Marine Cooling Circuit
The 8170ZC900-5 utilizes a dual-loop cooling configuration featuring an integrated fresh-water heat exchanger and a seawater pump. The zinc anodes located inside the raw-water cooling covers must be inspected every 250 operational hours. These sacrificial elements prevent galvanic corrosion from eating away at the copper-nickel cooling tubes. If your vessel operates in shallow, sandy rivers, flush the heat exchanger core every six months to clear out silt accumulations that block heat transfer.
Fuel System Cleaning and Injection Pump Calibration
High-sulfur marine diesel or contaminated bunker fuel will quickly degrade the mechanical injection nozzles. HekoPower recommends installing a multi-stage water separator before the primary Weichai fuel filters.
The mechanical fuel injection pump needs precise calibration every 3,000 hours to maintain equal fuel delivery across all eight cylinders. Unbalanced injection volumes cause uneven thermal loading, which can lead to micro-fractures in the aluminum alloy pistons.
Crankcase Ventilation and Valve Train Maintenance
The four-valve technology utilized in each cylinder head enhances breathing efficiency but demands exact valve clearance settings. Check and adjust the intake and exhaust valve clearances every 1,000 operating hours when the engine is completely cold. Ensure that the crankcase breather filter remains free of oil sludge, as excessive crankcase pressure will force engine oil past the rear crankshaft oil seals, creating dangerous oil leaks in the engine room.
Genuine Parts Sourcing: Replacing Wear Components
Over extended lifespans, certain mechanical components face inevitable friction wear. Sourcing exact specification replacements keeps your engine operating within its original factory performance parameters.
Cylinder Liners and Wet Sleeve Maintenance
The Weichai 8170 series employs replaceable wet cylinder liners. Over thousands of hours, the rapid harmonic vibrations of the pistons create tiny vacuum bubbles in the cooling jacket, a destructive process known as cavitation. When executing a mid-life engine inspection, examine the outer walls of the liners for pitting. Always replace the specialized rubber O-rings at the base of the liner to prevent coolant from leaking down into the oil pan.
Crankshaft Main Bearings and Babbitt Integrity
The heavy nodular iron crankshaft rotates within high-lead babbitt bearings designed to withstand immense downward force. During scheduled oil analyses, keep a close eye on trace copper or lead levels in the oil. Elevated counts indicate that the bearing overlays are wearing down. Replacing these main bearing shells before they score the crankshaft journals prevents an expensive, full-engine-out overhaul.
Weichai 170 series marine diesel engine, original products from Weichai. This series mainly includes X6170ZC350-1, X6170ZC408-1, X6170ZC450-1, X6170ZC540-1, X6170ZC450-2, X6170ZC480-2, X6170ZC540-2, X6170ZC620-2, X6170ZC650-2, X6170ZC580-3, X6170ZC608-3, X6170ZC680-3, X6170ZC735-3, X6170ZC620-4, X6170ZC620-5, X6170ZC550-5, X6170ZC756-5, X6170ZC818-5, 8170ZC600-1, 8170ZC720-2, 8170ZC818-3, 8170ZC900-3, 8170ZC900-5, 8170ZC1000-5.
Frequently Asked Questions Regarding the Weichai 8170ZC900-5
What is the exact fuel consumption rate of the Weichai 8170ZC900-5 marine engine?
Under standard rated operating conditions at 1500 RPM, the engine burns approximately 198 grams of fuel per kilowatt-hour. This highly efficient consumption profile is achieved through a optimized combustion chamber design and precise matching of the turbocharger pressure ratio.
Can this engine be fitted with an electric starting system instead of air starting?
Yes. The Weichai 8170 series offers dual starting options. It can be built with a standard 24-volt electric starting motor or an air-powered starter motor depending on your vessel’s existing infrastructure and regulatory class requirements.
Which classification society certificates can HekoPower provide for this engine?
As an experienced supplier, HekoPower can deliver this Weichai marine engine with major global classification certifications. These include CCS (China Classification Society), BV (Bureau Veritas), and ABS (American Bureau of Shipping) documentation based on your specific ordering instructions.
What type of lubricating oil is recommended for the 8-cylinder Weichai 170 series?
This heavy-duty platform requires high-performance marine diesel engine oil with a viscosity grade of SAE 15W-40 or SAE 40, depending on your local climate. The oil must meet or exceed API CF-4 or CH-4 specifications to properly protect the valve train and handle high soot loads.
