Yanmar 4JH80 Marine Diesel Engine – 80 HP
The Yanmar 4JH80 Marine Diesel Engine 80 HP is a powerful, compact, and fuel-efficient inboard diesel engine designed for sailing yachts, motor sailers, cruising boats, and marine repowering projects.
Powered by a 1.995-litre inline four-cylinder engine, the Yanmar 4JH80 delivers 80 metric HP (58.8 kW) at 3,200 RPM. It features electronically controlled Bosch common-rail direct injection, turbocharging, intercooling, and freshwater cooling with a heat exchanger.
As part of Yanmar’s JH-CR series, the 4JH80 combines modern diesel technology with dependable marine performance and flexible propulsion options.
Why Choose the Yanmar 4JH80?
Powerful and Efficient Performance
The 80 HP engine provides responsive acceleration and dependable auxiliary propulsion for sailing yachts and small cruising vessels.
Advanced Common-Rail Technology
The Bosch common-rail injection system delivers precise fuel control, smooth engine operation, and efficient combustion.
Turbocharged and Intercooled
Turbocharging and intercooling support strong power delivery from the compact four-cylinder engine.
Compact and Lightweight Design
With an engine-only dry weight of approximately 229 kg, the 4JH80 offers an attractive power-to-weight ratio for compatible marine installations.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Yanmar Marine |
| Engine Model | 4JH80 |
| Engine Type | Four-stroke marine diesel |
| Configuration | Inline four-cylinder |
| Displacement | 1.995 litres |
| Maximum Crankshaft Power | 80 metric HP / 58.8 kW |
| Rated Engine Speed | 3,200 RPM |
| Published Propeller-Shaft Power | 76.7 metric HP / 56.4 kW |
| Bore × Stroke | 84 × 90 mm |
| Fuel Injection | Bosch electronic common rail |
| Aspiration | Turbocharged and intercooled |
| Cooling System | Freshwater cooling with heat exchanger |
| Electrical System | 12V |
| Alternator | 12V / 125A |
| Dry Weight Without Gearbox | 229 kg |
| Dimensions* | 909 × 613 × 675 mm |
| Controls | Mechanical; optional electronic vessel controls |
| Gearbox Options | KM4A2, KMH4A, ZF25A, ZF30M |
| Saildrive Option | Yanmar SD60 |
| Applications | Sailing yachts, motor sailers and cruising boats |
Published dimensions include the KM4A2 gearbox. Measurements vary with transmission and exhaust configuration.
Compatible Gearboxes and Saildrives
The Yanmar 4JH80 supports several manufacturer-documented marine transmission options:
| Transmission | Published Reduction Ratios |
|---|---|
| KM4A2 | 1.47:1, 2.14:1, 2.63:1 |
| KMH4A | 2.04:1, 2.45:1 |
| ZF25A | 1.93:1, 2.80:1 |
| ZF30M | 2.15:1, 2.70:1 |
| SD60 Saildrive | 2.23:1, 2.49:1, 2.51:1 |
The correct gearbox or saildrive must be selected according to the vessel’s shaft arrangement, propeller requirements, and installation dimensions.
Engine Controls and Applications
The Yanmar 4JH80 is supplied with mechanical control capability, with compatible electronic vessel-control options available.
Depending on the package, instrumentation may include the Yanmar B25 or C35 panel and compatible digital engine-monitoring equipment.
The engine is suitable for sailing yachts, motor sailers, cruising boats, and compatible repowering projects.
The published 80 HP rating is maximum output, not unrestricted continuous-duty power. Yanmar’s operating manual identifies a lower continuous-power rating.
Price, Package Contents and Warranty
Price: Contact JB Marine GmbH for a quotation.
Depending on the selected package, equipment may include the engine, alternator, starter motor, heat exchanger, exhaust mixing elbow, flexible mounts, instrument panel, fuel pre-filter, and other standard accessories.
Marine gearboxes, saildrives, electronic controls, and additional installation equipment must be confirmed in the quotation.
Warranty: Applicable manufacturer or seller warranty terms depend on the engine’s condition and supply arrangement. Coverage will be confirmed before purchase.
Frequently Asked Questions
How Much Power Does the Yanmar 4JH80 Produce?
The engine delivers 80 metric HP (58.8 kW) at 3,200 RPM.
Is the Yanmar 4JH80 Turbocharged?
Yes. It features turbocharging and intercooling.
Does the Yanmar 4JH80 Use Common-Rail Injection?
Yes. It uses an electronically controlled Bosch common-rail direct-injection system.
What Gearboxes Are Compatible?
Documented options include KM4A2, KMH4A, ZF25A, and ZF30M marine gearboxes.
Can the Yanmar 4JH80 Be Used with a Saildrive?
Yes. The engine supports compatible Yanmar SD60 saildrive configurations.
Is the Yanmar 4JH80 Suitable for Repowering?
Yes, provided the vessel’s engine mounts, gearbox or saildrive, exhaust, cooling system, and installation dimensions are compatible.
Buy the Yanmar 4JH80 from JB Marine GmbH
Looking for a Yanmar 4JH80 80 HP marine diesel engine for sale?
JB Marine GmbH provides quotations for Yanmar marine diesel engines, compatible gearbox and saildrive packages, and international shipping.
Contact our sales team with your vessel details, preferred transmission, required quantity, and delivery destination.
Request your Yanmar 4JH80 quotation today.
Website: https://jbmarinegmbh.de/
