Yanmar 6HYM-WET 500HP Diesel Marine Inboard Engine
The Yanmar 6HYM-WET 500HP Marine Diesel Engine is a heavy-duty six-cylinder diesel propulsion engine developed for commercial fishing vessels, workboats, passenger boats, and demanding marine repowering projects.
Producing 500 metric HP (368 kW) at 1,950 RPM under its H-rating, the Yanmar 6HYM-WET combines a 13.733-litre displacement with twin turbochargers, intercooling, direct fuel injection, and heat-exchanger cooling.
Designed for conventional inboard shaft-drive propulsion, this engine provides substantial torque, durable construction, and reliable performance for professional marine operators.
Why Choose the Yanmar 6HYM-WET?
Powerful 500 HP Commercial Performance
The engine delivers 368 kW at 1,950 RPM, providing substantial propulsion power for appropriately matched commercial vessels.
Twin-Turbocharged Diesel Technology
The 6HYM-WET features twin turbochargers and intercooling to improve intake-air delivery and support efficient combustion under demanding loads.
Four-Valve Cylinder Design
With four valves per cylinder and direct fuel injection, the engine is designed to support effective combustion, dependable power delivery, and efficient marine operation.
Heavy-Duty Marine Construction
The large-displacement inline-six configuration, heat-exchanger cooling, and compatibility with hydraulic marine gearboxes make the 6HYM-WET suitable for demanding shaft-drive installations.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Yanmar |
| Engine Model | 6HYM-WET |
| Engine Series | Yanmar 6HY |
| Engine Type | Four-stroke marine diesel |
| Configuration | Inline six-cylinder |
| Displacement | 13.733 litres |
| Rated Power — H-Rating | 500 metric HP / 368 kW |
| Rated Engine Speed | 1,950 RPM |
| Bore × Stroke | 132.9 × 165 mm |
| Fuel Injection | Direct injection |
| Aspiration | Twin turbocharged and intercooled |
| Valvetrain | Four valves per cylinder |
| Cooling System | Freshwater cooling with heat exchanger |
| Starting System | 24V electric starter |
| Starter Motor | 6.0 kW |
| Engine Controls | Mechanical |
| Flywheel Housing | SAE No. 1 |
| Flywheel Diameter | 14 inches |
| Dry Engine Weight | Approximately 1,385 kg without gearbox |
| Engine Dimensions (L × W × H) | 1,556 × 1,014 × 1,133 mm |
| Emissions | IMO Tier II, applicable certified configuration |
| Compatible Gearboxes | YXH-160 / YX-161L |
| Propulsion | Conventional inboard shaft drive |
| Applications | Fishing vessels, workboats, passenger vessels and repowering |
Specifications refer to the manufacturer-documented 6HYM-WET H-rated engine. Weight and dimensions exclude the marine gearbox.
Compatible Marine Gearboxes and Controls
The Yanmar 6HYM-WET 500HP supports selected heavy-duty hydraulic marine transmissions.
| Marine Gearbox | Published Reduction Ratios |
|---|---|
| Yanmar YXH-160 | 1.97:1 / 2.46:1 / 3.05:1 |
| Yanmar YX-161L | 3.65:1 / 4.08:1 / 4.55:1 |
Both gearbox models use hydraulic multi-disc clutches.
The correct gearbox and reduction ratio must be selected according to the vessel’s displacement, propeller size, shaft arrangement, and operating requirements.
Compatible Control Equipment
Depending on the engine and gearbox configuration, suitable equipment may include:
- Mechanical throttle and shift controls
- Yanmar engine instrument panel
- Engine temperature and oil-pressure monitoring
- Engine warning and protection systems
- Compatible wiring harnesses
- Remote engine control cables
- Marine shaft couplings and installation accessories
Applications and Duty Ratings
The Yanmar 6HYM-WET is suitable for appropriately matched commercial marine applications, including fishing vessels, workboats, passenger boats, utility vessels, and heavy-duty repowering projects.
Published Engine Power Ratings
| Rating | Output | Rated Speed |
|---|---|---|
| H-Rating | 500 metric HP / 368 kW | 1,950 RPM |
| M-Rating | 600 metric HP / 441 kW | 2,100 RPM |
| L-Rating | 650 metric HP / 478 kW | 2,150 RPM |
| S-Rating | 700 metric HP / 515 kW | 2,200 RPM |
The 500 HP H-rating is the manufacturer’s 24-hour rating category. The higher M, L, and S ratings have progressively more restrictive rated-output operating durations.
The engine must be operated within Yanmar’s applicable load, speed, and maintenance requirements.
Price, Package Contents and Warranty
Price: Contact JB Marine GmbH for a quotation.
Depending on the selected configuration, the package may include:
- Yanmar 6HYM-WET 500HP marine diesel engine
- Twin turbochargers and intercooler
- Freshwater cooling system
- Electric starter motor
- Compatible hydraulic marine gearbox
- Engine instrument panel
- Selected wiring and installation accessories
The gearbox, alternator, exhaust components, shaft coupling, engine mounts, and additional accessories must be specifically confirmed in the quotation.
Warranty: Applicable manufacturer or seller warranty coverage depends on the engine’s condition, production year, market, and supply arrangement. Full warranty terms will be confirmed before purchase.
Frequently Asked Questions
How Much Power Does the Yanmar 6HYM-WET Produce?
The H-rated engine produces 500 metric HP (368 kW) at 1,950 RPM.
What Is the Displacement of the Yanmar 6HYM-WET?
The engine has a displacement of 13.733 litres.
Is the Yanmar 6HYM-WET Twin-Turbocharged?
Yes. It features twin turbochargers and an intercooler.
Which Marine Gearboxes Are Compatible?
Manufacturer-documented options include the Yanmar YXH-160 and YX-161L hydraulic marine gearboxes.
What Is the Difference Between the 500 HP and 700 HP Versions?
The 500 HP configuration uses Yanmar’s H-rating, while the 700 HP configuration uses the S-rating. The ratings have different maximum outputs, operating speeds, and permitted operating durations.
Is the Yanmar 6HYM-WET Suitable for Commercial Repowering?
Yes. It can be suitable for compatible commercial repowering projects, provided the engine dimensions, mounting system, transmission, propeller, shafting, cooling, and exhaust requirements are correctly matched.
Buy the Yanmar 6HYM-WET 500HP from JB Marine GmbH
Looking for a Yanmar 6HYM-WET 500HP diesel marine inboard engine for sale?
JB Marine GmbH provides quotations for Yanmar commercial marine diesel engines, compatible hydraulic gearboxes, propulsion accessories, and international shipping.
Contact our sales team with your vessel specifications, preferred gearbox ratio, required quantity, and delivery destination.
Request your Yanmar 6HYM-WET 500HP quotation today.
Website: https://jbmarinegmbh.de/
