Yanmar 8LV370 (Z) 370HP Inboard Diesel Engine
The Yanmar 8LV370 (Z) 370HP Inboard Diesel Engine is a powerful, compact V8 marine diesel engine developed for recreational motor yachts, sports cruisers, fishing boats, and high-performance marine propulsion applications.
Producing 370 metric horsepower (272 kW) at 3,800 RPM, the Yanmar 8LV370 combines a 4.46-litre, eight-cylinder diesel engine with advanced Denso common-rail fuel injection, twin turbochargers, charge-air cooling, and electronic engine controls.
Despite its substantial power output, the engine has a published dry weight of approximately 435 kg without the marine gearbox, making it an attractive option for installations where engine-room space and weight are important considerations.
The Yanmar 8LV370 is available with compatible inboard marine transmissions, including the KMH50A down-angle gearbox and KMH52V V-drive. The related 8LV370Z configuration is designed for the Yanmar ZT370 sterndrive.
At JB Marine GmbH, customers can enquire about the Yanmar 8LV370 for new propulsion installations, replacement engines, compatible gearbox packages, and marine repowering projects.
Why Choose the Yanmar 8LV370 Marine Diesel Engine?
370 HP High-Performance V8 Power
The Yanmar 8LV370 delivers 370 metric horsepower at 3,800 RPM from its compact 4.46-litre V8 engine.
Its 90-degree V8 configuration provides smooth engine operation and responsive acceleration for compatible recreational vessels.
The engine is particularly suited to applications requiring substantial power without the size and weight of some larger-displacement marine diesel engines.
Compact and Lightweight Engine Design
A major advantage of the Yanmar 8LV370 is its compact construction.
The manufacturer’s published dry engine weight is approximately 435 kg, excluding the transmission.
This can be beneficial when planning:
- Marine engine replacements
- New recreational boat installations
- Twin-engine propulsion arrangements
- Engine-room layouts
- Weight-sensitive repowering projects
Actual installation weight depends on the selected gearbox, exhaust components, mounts, and accessories.
Advanced Denso Common-Rail Fuel Injection
The Yanmar 8LV370 uses electronically controlled Denso common-rail direct fuel injection.
This system precisely regulates fuel delivery according to engine operating conditions.
Benefits include:
- Responsive throttle operation
- Accurate fuel delivery
- Smooth engine performance
- Efficient combustion
- Electronic engine monitoring
- Controlled power delivery
Regular fuel-filter replacement and clean diesel fuel remain essential for dependable operation.
Twin-Turbocharged and Intercooled Performance
The Yanmar 8LV370 uses two turbochargers with charge-air cooling.
The turbochargers increase combustion-air delivery, while the intercooling system helps reduce intake-air temperature.
This arrangement supports strong acceleration and high power output from the engine’s relatively compact displacement.
Smooth V8 Engine Operation
The 90-degree V8 configuration provides balanced engine operation and a distinctive combination of compact packaging and substantial output.
When correctly installed, the engine offers refined propulsion characteristics suitable for recreational cruising.
Correct engine mounts, shaft alignment, exhaust design, and propeller selection are important for achieving comfortable onboard operation.
Flexible Marine Propulsion Options
The Yanmar 8LV370 engine family supports multiple propulsion arrangements.
These include:
- Conventional inboard shaft drive
- Down-angle marine gearbox
- V-drive transmission
- Sterndrive propulsion with the 8LV370Z variant
This flexibility makes the engine family relevant to both new installations and selected repowering projects.
Electronic Vessel Controls
The Yanmar 8LV370 supports compatible electronic vessel control systems.
Depending on the installed control generation and accessories, functions may include:
- Electronic throttle and shift
- Engine monitoring
- Digital instrumentation
- Engine alarms
- Single- and twin-engine operation
- Multiple helm stations
- Compatible joystick maneuvering
Control-system compatibility must be verified before ordering.
Technical Specifications
The following specifications are based on published Yanmar 8LV370 and 8LV370Z manufacturer documentation.
| Specification | Details |
|---|---|
| Manufacturer | Yanmar |
| Engine model | 8LV370 / 8LV370Z |
| Engine series | 8LV |
| Engine type | Four-stroke marine diesel |
| Engine configuration | 90-degree V8 |
| Number of cylinders | 8 |
| Displacement | 4.461 litres |
| Bore × stroke | 86 × 96 mm |
| Maximum crankshaft power | 272 kW / 370 metric HP |
| Rated engine speed | 3,800 RPM |
| Published continuous crankshaft output | 248 kW / 337 metric HP at 3,683 RPM |
| Fuel injection | Denso electronically controlled common rail |
| Combustion system | Direct injection |
| Aspiration | Twin turbocharged and intercooled |
| Cooling system | Freshwater cooling with heat exchanger |
| Engine management | Electronic |
| Electrical system | 12V |
| Alternator | 12V / 180A |
| Low idle speed | Approximately 550 RPM |
| Crankshaft rotation | Counterclockwise, viewed from flywheel |
| Engine lubrication | Forced lubrication with gear pump |
| Dry engine weight without gearbox | Approximately 435 kg |
| Overall dimensions with KMH50A | Approximately 1,340 × 880 × 766 mm |
| Inboard transmission options | KMH50A, KMH52V and other approved configurations |
| Sterndrive option | ZT370 with 8LV370Z |
| Engine controls | Electronic |
| Intended application | Primarily recreational marine propulsion |
YANMAR’s 370 HP designation uses metric horsepower (mhp/PS), equivalent to approximately 365 mechanical horsepower. The listed dimensions include the KMH50A gearbox and standard exhaust arrangement; they are not bare-engine dimensions.
Compatible Gearboxes, Sterndrives and Control Systems
Yanmar KMH50A Marine Gearbox
The Yanmar KMH50A is a documented down-angle marine gearbox for the 8LV370.
It uses a hydraulically actuated multiple-friction-disc clutch and is designed for conventional shaft-drive propulsion.
Published specifications include:
| Specification | KMH50A |
|---|---|
| Gearbox type | Hydraulic marine reverse-reduction gearbox |
| Installation angle | 8° down-angle |
| Reduction ratio option 1 | 1.67:1 |
| Reduction ratio option 2 | 2.13:1 |
| Reduction ratio option 3 | 2.43:1 |
| Gearbox dry weight | Approximately 43 kg, excluding specified accessories |
| Published engine and gearbox dry weight | Approximately 494 kg |
The correct reduction ratio depends on vessel displacement, propeller diameter, propeller pitch, and operating requirements.
Yanmar KMH52V V-Drive Gearbox
The Yanmar KMH52V provides an alternative installation arrangement for compatible vessels.
Its integrated V-drive design can be useful where engine-room layout requires a different propulsion shaft arrangement.
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 |
| Gearbox dry weight | Approximately 59 kg, excluding specified accessories |
| Published engine and gearbox dry weight | Approximately 514 kg |
Before ordering, confirm the appropriate reduction ratio and installation dimensions.
Additional Gearbox Options
Yanmar also publishes installation drawings for other gearbox arrangements, including the ZF220.
However, a published installation drawing does not mean that every available ratio or gearbox version is suitable for every vessel.
Final compatibility must be checked against the engine’s torque, gearbox rating, mounting arrangement, and intended operating duty.
Yanmar ZT370 Sterndrive — 8LV370Z
The 8LV370Z is the sterndrive version of the 8LV370 engine family.
It is designed for use with the Yanmar ZT370 sterndrive.
Published ZT370 specifications include:
| Specification | ZT370 |
|---|---|
| Drive type | Marine sterndrive |
| Rated input power | 272 kW / 370 metric HP |
| Clutch type | Hydraulic multiple-friction-plate |
| General drive ratio range | 1.65:1, 1.78:1, 1.97:1, 2.18:1 |
| Ratios documented for 8LV applications | 1.65:1 and 1.78:1 |
| Propeller arrangement | Counter-rotating dual propellers |
| Dry drive weight | Approximately 112 kg |
The yanmar-8lv370-z should not automatically be treated as interchangeable with an existing inboard shaft-drive installation.
Yanmar VC10 and VC20 Controls
Yanmar identifies the VC10 and VC20 control families among compatible products for the 8LV370.
Depending on the engine and control-system generation, these systems support electronic propulsion controls and engine monitoring.
The correct control system must be selected for the engine’s electronic configuration.
Joystick Maneuvering
Compatible installations may support Yanmar joystick systems.
The JC20A is intended for suitable shaft-drive applications, while the JC10A is associated with compatible sterndrive arrangements.
Joystick capability requires the appropriate control system and additional installation equipment.
It is not automatically included with a standard engine package.
Duty Rating and Marine Applications
The Yanmar 8LV370 (Z) is primarily designed for recreational marine propulsion.
The manufacturer’s operation manual identifies the following outputs:
| Operating specification | Published output |
|---|---|
| Maximum crankshaft output | 272 kW / 370 metric HP at 3,800 RPM |
| Continuous crankshaft output | 248 kW / 337 metric HP at 3,683 RPM |
These are distinct operating specifications.
The maximum 370 HP output should not be interpreted as unrestricted continuous commercial-duty power.
Recreational Marine Applications
Suitable applications may include:
- Sports cruisers
- Motor yachts
- Recreational fishing boats
- High-performance powerboats
- Planing motor cruisers
- Twin-engine installations
- Marine repowering projects
Commercial Marine Applications
Yanmar states that the Yanmar 8LV370 (Z) is not EPA Commercial certified.
Commercial suitability must therefore be evaluated according to the intended operating region, applicable certification, and manufacturer’s requirements.
Customers planning commercial service should obtain written confirmation of suitability before purchasing.
Price, Package Contents and Warranty
Yanmar 8LV370 (Z) 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 enquire about:
- Yanmar 8LV370 engine-only assembly
- 8LV370 with KMH50A marine gearbox
- 8LV370 with KMH52V V-drive
- 8LV370Z with compatible ZT370 sterndrive
- Replacement 8LV370 engine
- Twin-engine propulsion packages, subject to availability
What’s Included in the Engine Package?
Depending on the exact configuration, the engine package may include:
- Yanmar 8LV V8 diesel engine
- Common-rail fuel injection equipment
- Twin turbochargers
- Charge-air cooling components
- Freshwater cooling components
- Electronic engine-management equipment
- Starter motor
- 12V / 180A alternator
- Flexible engine mounts
- Freshwater expansion tank
- Selected standard exhaust components
Additional equipment may include:
- Marine gearbox
- Sterndrive
- Engine wiring harness
- Electronic controls
- Digital instrumentation
- Shaft coupling
- Propeller equipment
- Steering components
- Additional installation accessories
Important: The actual package contents must be confirmed in the quotation. A gearbox, sterndrive, or electronic control system should not be assumed included unless specifically listed.
Warranty Information
Warranty coverage depends on the engine’s condition, manufacturing year, supply channel, and applicable manufacturer or seller terms.
Eligible new engines may qualify for Yanmar manufacturer warranty coverage under the relevant conditions.
Used, reconditioned, or older-stock engines 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 8LV370 Produce?
The Yanmar 8LV370 produces 370 metric HP (272 kW) at 3,800 RPM.
What Is the Difference Between the 8LV370 and 8LV370Z?
The 8LV370 is offered for compatible inboard marine transmissions.
The 8LV370Z is the sterndrive configuration designed for the Yanmar ZT370 propulsion system.
What Is the Displacement of the Yanmar 8LV370?
The engine has a displacement of approximately 4.46 litres and uses a 90-degree V8 configuration.
Is the Yanmar 8LV370 Twin-Turbocharged?
Yes. The engine uses twin turbochargers with charge-air cooling.
Does the Yanmar 8LV370 Use Common-Rail Injection?
Yes. It uses electronically controlled Denso common-rail direct fuel injection.
What Gearboxes Are Compatible with the Yanmar 8LV370?
Published configurations include the KMH50A down-angle gearbox and KMH52V V-drive.
Other transmission arrangements require verification.
How Much Does the Yanmar 8LV370 Weigh?
The published dry engine weight is approximately 435 kg without the gearbox.
A documented KMH50A package weighs approximately 494 kg.
Does the Yanmar 8LV370 Support Electronic Controls?
Yes. Yanmar identifies compatible VC10 and VC20 electronic vessel control products.
Is the Yanmar 8LV370 Suitable for Commercial Boats?
The engine is primarily intended for recreational propulsion.
Yanmar states that the 8LV370 is not EPA Commercial certified.
Can I Replace My Existing Marine Engine with a yanmar-8lv370-z?
Potentially. Compatibility depends on the existing engine, vessel displacement, gearbox, propeller shaft, engine mounts, cooling system, exhaust arrangement, and electronic controls.
A professional repowering assessment is recommended.
Buy the Yanmar 8LV370 (Z) 370HP Inboard Diesel Engine from JB Marine GmbH
Looking for a Yanmar 8LV370 (Z) marine diesel engine for sale?
At JB Marine GmbH, customers can enquire about the yanmar-8lv370-z engine family for motor yachts, sports cruisers, recreational fishing boats, and compatible marine repowering projects.
Whether you require an inboard shaft-drive engine, a compatible KMH gearbox, a V-drive arrangement, or the related ZT370 sterndrive configuration, selecting the correct propulsion package is essential.
For an accurate quotation, please provide:
- Required engine model: 8LV370 or 8LV370Z
- Existing engine model and serial number
- Vessel make and model
- Required quantity
- Gearbox or sterndrive requirements
- Required reduction ratio
- Existing electronic control system
- Required accessories
- Delivery country and destination
Contact JB Marine GmbH today for Yanmar 8LV370 pricing, availability, gearbox and sterndrive options, warranty information, and international shipping quotations.
Website: https://jbmarinegmbh.de/
