YANMAR 8LV-320 Marine Diesel Engine 320 HP
The YANMAR 8LV-320 Marine Diesel Engine 320 HP is a compact, high-performance V8 inboard diesel engine designed for recreational motor yachts, sports cruisers, fishing boats, and compatible marine repowering projects.
Producing 320 metric horsepower (235 kW) at 3,800 RPM, the YANMAR 8LV-320 combines a 4.46-litre, 90-degree V8 engine with electronically controlled Denso common-rail direct fuel injection, twin turbochargers, charge-air cooling, and advanced electronic engine management.
Part of YANMAR’s established 8LV marine diesel series, the engine provides substantial propulsion power from a compact engine platform. Its combination of smooth V8 operation, responsive acceleration, and flexible transmission options makes it suitable for a variety of recreational marine applications.
The 8LV-320 can be configured with compatible inboard marine gearboxes, including the YANMAR KMH50A down-angle gearbox and KMH52V V-drive. The related 8LV-320Z variant is intended for sterndrive propulsion using the YANMAR ZT370.
At JB Marine GmbH, customers can request quotations for the YANMAR 8LV-320, including engine-only assemblies, compatible gearbox packages, electronic controls, installation accessories, warranty arrangements, and international shipping.
Why Choose the YANMAR 8LV-320?
Powerful 320 HP V8 Diesel Performance
The YANMAR 8LV-320 delivers 235 kW (320 mhp) at 3,800 RPM.
Its eight-cylinder configuration and 4.46-litre displacement provide substantial power for appropriately matched recreational vessels.
The engine is particularly suitable for applications requiring responsive acceleration and a compact propulsion installation.
Compact and Lightweight V8 Construction
Despite its substantial output, the YANMAR 8LV-320 has a published dry engine weight of approximately 435 kg without the marine gearbox.
This makes it an attractive option for:
- Recreational marine repowering
- New motor yacht installations
- Sports cruiser propulsion
- Twin-engine arrangements
- Weight-sensitive engine-room layouts
The complete installation weight depends on the selected transmission, cooling and exhaust equipment, and additional accessories.
Advanced Denso Common-Rail Fuel Injection
The YANMAR 8LV-320 uses electronically controlled Denso common-rail direct injection.
The engine-management system regulates fuel delivery according to operating conditions.
Benefits include:
- Accurate fuel injection
- Responsive throttle operation
- Smooth engine performance
- Efficient combustion
- Electronic engine monitoring
- Controlled power delivery
Proper fuel filtration and the use of manufacturer-approved diesel fuel remain essential for dependable operation.
Twin-Turbocharged and Intercooled Performance
The YANMAR 8LV-320 uses two turbochargers with charge-air cooling.
The turbochargers increase the amount of air delivered to the engine, while the intercooling system helps reduce compressed-air temperature.
This arrangement supports high power output and responsive performance from the engine’s relatively compact displacement.
Smooth and Responsive V8 Operation
The 90-degree V8 configuration is designed to deliver smooth operation across the engine’s operating range.
YANMAR highlights the 8LV series’ broad operating-speed range, extending from approximately 550 RPM idle to 3,800 RPM rated speed.
This provides flexibility for low-speed maneuvering and responsive cruising in compatible vessels.
Flexible Marine Transmission Options
The YANMAR 8LV-320 supports different propulsion arrangements, including:
- Conventional inboard shaft drive
- Down-angle marine gearbox
- V-drive transmission
- Sterndrive propulsion with the related 8LV-320Z version
The correct arrangement depends on the vessel’s existing propulsion system, shaft alignment, engine-room layout, and performance requirements.
Electronic Vessel Control
The YANMAR 8LV-320 uses electronic engine management and compatible YANMAR vessel control equipment.
Depending on the installed system, available functions may include:
- Electronic throttle and shift
- Digital engine monitoring
- Engine alarms
- Single- and twin-engine operation
- Multiple helm stations
- Compatible NMEA 2000 integration
- Optional joystick maneuvering
The precise functions depend on the selected controls and accessories.
Technical Specifications
The following specifications are based on published YANMAR 8LV320 manufacturer documentation.
| Specification | Details |
|---|---|
| Manufacturer | YANMAR |
| Engine model | 8LV320 / 8LV-320 |
| Engine series | 8LV |
| Engine type | Four-stroke marine diesel |
| Engine configuration | 90-degree V8 |
| Number of cylinders | 8 |
| Displacement | 4.46 litres |
| Bore × stroke | 86 × 96 mm |
| Maximum crankshaft output | 235 kW / 320 metric HP |
| Rated engine speed | 3,800 RPM |
| Published continuous crankshaft output | 214 kW / 291 metric HP at 3,683 RPM |
| Combustion system | Direct injection |
| Fuel injection | Denso electronically controlled common rail |
| Aspiration | Twin turbocharged and intercooled |
| Cooling system | Freshwater cooling with seawater heat exchanger |
| Engine management | Electronic |
| Starting system | 12V electric starter |
| Starter motor | 12V / 2.7 kW |
| Alternator | 12V / 180A |
| Starting assistance | Glow-plug system |
| Low idle speed | Approximately 550 RPM |
| Crankshaft rotation | Counterclockwise, viewed from stern |
| Lubrication | Enclosed forced-lubrication system |
| Dry engine weight without gearbox | Approximately 435 kg |
| Dimensions with KMH50A gearbox | Approximately 1,340 × 880 × 766 mm |
| Inboard gearbox options | KMH50A, KMH52V |
| Additional documented installation | ZF220 gearbox arrangement |
| Sterndrive version | 8LV320Z with ZT370 |
| Electronic controls | YANMAR VC10; other compatible controls subject to configuration |
| Published certifications | EU RCD 2, IMO Tier 2, US EPA Tier 3 and other configuration-dependent approvals |
| Primary applications | Recreational motor yachts, sports cruisers, fishing boats and repowering |
YANMAR specifies 320 metric horsepower (mhp/PS), equivalent to approximately 315.6 mechanical horsepower. The published overall dimensions include the KMH50A gearbox and standard mixing elbow, not a bare engine.
Compatible Gearboxes, Sterndrives and Control Systems
YANMAR KMH50A Marine Gearbox
The YANMAR KMH50A is a manufacturer-documented down-angle marine gearbox for the 8LV-320.
It uses a hydraulically actuated multi-friction-disc clutch.
Published specifications include:
| Specification | KMH50A |
|---|---|
| Gearbox type | Hydraulic marine reverse-reduction gearbox |
| Down-angle | 8° |
| Reduction ratio option 1 | 1.67:1 |
| Reduction ratio option 2 | 2.13:1 |
| Reduction ratio option 3 | 2.43:1 |
| Published dry engine-and-gearbox package weight | Approximately 494 kg |
The appropriate reduction ratio must be selected according to the vessel’s displacement, hull characteristics, shaft arrangement, and propeller requirements.
YANMAR KMH52V V-Drive Gearbox
The YANMAR KMH52V provides an alternative transmission arrangement for compatible vessels.
It features an integral V-drive configuration.
Published specifications include:
| Specification | KMH52V |
|---|---|
| Gearbox type | Hydraulic marine V-drive |
| V-drive angle | 12° |
| Reduction ratio option 1 | 1.22:1 |
| Reduction ratio option 2 | 1.58:1 |
| Reduction ratio option 3 | 2.08:1 |
| Reduction ratio option 4 | 2.47:1 |
| Published dry engine-and-gearbox package weight | Approximately 514 kg |
A V-drive arrangement may be suitable where the vessel’s engine-room layout requires a different shaft-drive configuration.
Additional ZF Gearbox Arrangements
YANMAR publishes installation drawings for the 8LV series with a ZF220 gearbox.
However, the availability of a drawing does not automatically establish approval for every gearbox variant, reduction ratio, or operating duty.
Final compatibility must be verified against the exact engine and transmission specifications.
YANMAR ZT370 Sterndrive — 8LV320Z
The related YANMAR 8LV320Z configuration is designed for use with the YANMAR ZT370 sterndrive.
The ZT370 uses a hydraulic clutch and counter-rotating propellers.
The manufacturer’s 8LV operation manual identifies 1.65:1 and 1.78:1 reduction ratios for the 8LV sterndrive applications.
The 8LV320Z should not be treated as a direct replacement for an existing inboard shaft-drive installation without evaluating the transom assembly, controls, steering, and installation requirements.
YANMAR VC10 Vessel Control System
The YANMAR VC10 system provides electronic propulsion control and compatible engine instrumentation.
Depending on the installation, it may include:
- Electronic throttle and shift
- CAN-bus communication
- Multifunction display
- Engine monitoring
- Multiple helm stations
- Compatible vessel-network integration
YANMAR also identifies VC20 among the compatible control products for the 8LV320 engine family.
The correct system must be confirmed for the engine generation being supplied.
Joystick Control Options
Compatible installations may support YANMAR joystick control systems.
The JC20A is associated with suitable shaft-drive installations, while the JC10A is intended for compatible sterndrive configurations.
Joystick functionality requires additional control and steering equipment and should not be assumed included in a standard engine package.
Duty Rating and Marine Applications
The YANMAR 8LV-320 is primarily intended for recreational marine propulsion.
The manufacturer’s operation manual publishes the following outputs:
| Operating specification | Published output |
|---|---|
| Maximum crankshaft output | 235 kW / 320 mhp at 3,800 RPM |
| Continuous crankshaft output | 214 kW / 291 mhp at 3,683 RPM |
These figures refer to different operating conditions.
The 320 HP maximum rating should not be interpreted as unrestricted continuous commercial-duty output.
Recreational Applications
Typical applications include:
- Motor yachts
- Sports cruisers
- Recreational fishing boats
- Planing powerboats
- Recreational motor cruisers
- Twin-engine propulsion installations
- Marine repowering projects
Commercial Applications
Commercial suitability depends on the engine’s applicable certification, operating profile, and manufacturer approval.
For commercial service, the required duty cycle and local emissions requirements should be confirmed before purchasing.
Price, Package Contents and Warranty
YANMAR 8LV-320 Engine Price
Price: Contact JB Marine GmbH for a quotation.
The final price depends on the engine’s condition, production year, transmission configuration, included accessories, and delivery destination.
Customers can request quotations for:
- YANMAR 8LV-320 bobtail engine
- 8LV-320 with KMH50A marine gearbox
- 8LV-320 with KMH52V V-drive
- 8LV-320 with approved alternative gearbox
- Related 8LV320Z sterndrive package
- Twin-engine propulsion packages, subject to availability
What’s Included in the Engine Package?
YANMAR identifies the following equipment in its standard engine package, depending on inboard or sterndrive configuration:
- YANMAR 8LV V8 diesel engine
- Standard exhaust mixing elbow for inboard versions
- 12V / 180A alternator
- VC10 vessel control equipment
- Flexible engine mounts
- Freshwater expansion tank
- Engine dipstick arrangement
- Selected standard engine accessories
The sterndrive version may include different standard equipment, such as through-drive exhaust and power-steering components.
Additional equipment may include:
- KMH50A or KMH52V marine gearbox
- ZT370 sterndrive
- Electronic control head
- Extension wiring harness
- Second helm station
- Joystick controls
- NMEA 2000 engine monitoring
- High-riser mixing elbow
- Water separator
- Hot-water connection
- Additional installation accessories
Important: Package contents vary by configuration. Only equipment specifically identified in the quotation should be considered included.
Warranty Information
Warranty coverage depends on the engine’s condition, manufacturing year, supply channel, and applicable manufacturer or seller terms.
Eligible new equipment may qualify for YANMAR manufacturer warranty coverage under the relevant conditions.
Used, reconditioned, and older-stock equipment may carry different warranty arrangements.
JB Marine GmbH will confirm the applicable warranty terms in writing before purchase.
Frequently Asked Questions
How Much Horsepower Does the YANMAR 8LV-320 Produce?
The YANMAR 8LV-320 produces 320 metric HP (235 kW) at 3,800 RPM.
What Is the Displacement of the YANMAR 8LV-320?
The engine has a displacement of 4.46 litres and uses a 90-degree V8 configuration.
Is the YANMAR 8LV-320 Twin-Turbocharged?
Yes. The engine uses twin turbochargers with charge-air cooling.
Does the YANMAR 8LV-320 Use Common-Rail Fuel Injection?
Yes. It uses electronically controlled Denso common-rail direct injection.
What Gearboxes Are Compatible with the YANMAR 8LV-320?
Manufacturer documentation identifies the KMH50A and KMH52V transmissions, along with additional documented installation arrangements.
What Is the Difference Between the 8LV320 and 8LV320Z?
The 8LV320 is offered for compatible inboard marine transmissions.
The 8LV320Z is the related sterndrive configuration designed for the YANMAR ZT370.
How Much Does the YANMAR 8LV-320 Weigh?
The published dry engine weight is approximately 435 kg without the marine gearbox.
Does the YANMAR 8LV-320 Support Electronic Controls?
Yes. The engine uses electronic management and compatible YANMAR vessel control systems.
Is the YANMAR 8LV-320 Suitable for Commercial Boats?
Commercial suitability depends on the applicable certification, operating conditions, and manufacturer’s approval.
The engine is primarily documented for recreational propulsion.
Can I Replace My Existing Marine Diesel Engine with a YANMAR 8LV-320?
Potentially. Compatibility depends on the existing engine, vessel displacement, gearbox, shaft arrangement, engine mounts, cooling system, exhaust configuration, and electronic controls.
A professional repowering assessment is recommended.
Buy the YANMAR 8LV-320 Marine Diesel Engine from JB Marine GmbH
Looking for a YANMAR 8LV-320 320 HP marine diesel engine for sale?
At JB Marine GmbH, customers can enquire about the YANMAR 8LV-320 for motor yachts, sports cruisers, recreational fishing vessels, and compatible marine repowering projects.
Whether you require an engine-only assembly, a complete engine-and-gearbox package, or the related sterndrive configuration, selecting the correct propulsion equipment is essential.
For an accurate quotation, please provide:
- Existing engine model and serial number
- Vessel make and model
- Required quantity
- Required gearbox or sterndrive
- Gearbox reduction ratio
- Existing electronic control system
- Required accessories
- Delivery country and destination
Contact JB Marine GmbH today for YANMAR 8LV-320 pricing, availability, compatible marine gearbox options, warranty information, and international shipping quotations.
Website: https://jbmarinegmbh.de/
