Yanmar 4CHE3 78HP Diesel Marine Inboard Engine
The Yanmar 4CHE3 78HP Diesel Marine Inboard Engine is a dependable four-cylinder diesel propulsion engine developed for commercial fishing boats, workboats, displacement cruisers, and compatible marine repowering projects.
Producing 78 metric HP (approximately 57.4 kW) at 2,550 RPM under its M-rating, the Yanmar 4CHE3 features a 4.33-litre displacement, naturally aspirated engine design, mechanical direct fuel injection, and freshwater cooling through a heat exchanger.
Engineered for conventional inboard shaft-drive propulsion, the Yanmar 4CHE3 78HP offers practical fuel efficiency, robust construction, and straightforward servicing.
Why Choose the Yanmar 4CHE3 78HP?
Reliable 78 HP Diesel Performance
The 4CHE3 delivers dependable power at moderate engine speeds, making it suitable for displacement vessels and appropriately matched commercial marine applications.
Naturally Aspirated Engine Design
The four-cylinder engine operates without a turbocharger, reducing intake-system complexity and simplifying routine maintenance.
Mechanical Direct Fuel Injection
The conventional mechanical fuel-injection system provides straightforward diesel operation without complex electronic common-rail controls.
Durable Marine Construction
With a freshwater cooling system and compatible hydraulic marine transmission, the Yanmar 4CHE3 is designed for reliable inboard propulsion.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Yanmar |
| Engine Model | 4CHE3 |
| Engine Type | Four-stroke marine diesel |
| Configuration | Inline four-cylinder |
| Displacement | 4.330 litres |
| Rated Power — M-Rating | 78 metric HP / approximately 57.4 kW |
| Rated Engine Speed — M-Rating | 2,550 RPM |
| Alternative L-Rating | 85 metric HP / approximately 62.5 kW |
| Rated Speed — L-Rating | 2,600 RPM |
| Bore × Stroke | 105 × 125 mm |
| Fuel Injection | Mechanical direct injection |
| Aspiration | Naturally aspirated |
| Engine Controls | Mechanical |
| Cooling System | Freshwater cooling with heat exchanger |
| Starting System | 24V electric starter |
| Starter Motor | 4.0 kW |
| Flywheel Housing | SAE No. 3 |
| Flywheel Size | 11.5 inches |
| Compatible Gearbox | Yanmar YX-30 |
| Dry Engine Weight | Approximately 500 kg without gearbox |
| Dry Weight with Gearbox | Approximately 570 kg |
| Reference Dimensions with Gearbox | 1,258 × 688 × 1,022 mm |
| Lubricating Oil Capacity | Approximately 15 litres |
| Freshwater Cooling Capacity | Approximately 16 litres, excluding reservoir |
| Propulsion | Conventional inboard shaft drive |
| Applications | Fishing vessels, workboats, cruisers, and repowering |
Technical specifications reflect published Yanmar 4CHE3 engine-family information. The engine identification plate and applicable manufacturer documentation should be checked before finalizing a sales quotation.
Compatible Marine Gearboxes and Controls
The Yanmar 4CHE3 78HP can be configured with a compatible Yanmar YX-30 hydraulic marine transmission.
| Marine Gearbox | Published Reduction Ratio |
|---|---|
| Yanmar YX-30 | 2.03:1 |
| Yanmar YX-30 | 2.55:1 |
| Yanmar YX-30 | 2.96:1 |
| Yanmar YX-30 | 3.48:1 |
The YX-30 uses a hydraulic multi-disc clutch and is designed for conventional shaft-drive propulsion.
Compatible Control Equipment
- Mechanical throttle and shift controls
- Yanmar engine instrument panel
- Engine temperature and oil-pressure monitoring
- Engine warning alarms
- Compatible wiring harness
- Flexible engine mounts and shaft coupling
The correct transmission ratio must be selected according to the vessel’s displacement, propeller size, shaft arrangement, and operating conditions.
Applications and Duty Ratings
The Yanmar 4CHE3 is suitable for compatible commercial and recreational marine applications, including fishing boats, workboats, passenger vessels, and displacement cruisers.
Yanmar documentation identifies two engine power ratings:
| Engine Rating | Maximum Output | Rated Speed |
|---|---|---|
| M-Rating | 78 metric HP / 57.4 kW | 2,550 RPM |
| L-Rating | 85 metric HP / 62.5 kW | 2,600 RPM |
The 78 HP M-rating should be distinguished from the 85 HP L-rating when selecting an engine for a particular vessel.
The appropriate duty rating depends on operating hours, load profile, and Yanmar’s approved application requirements. Neither maximum-power figure should automatically be described as unrestricted continuous output.
Price, Package Contents and Warranty
Price: Contact JB Marine GmbH for a quotation.
Depending on the selected configuration, the package may include:
- Yanmar 4CHE3 78HP marine diesel engine
- Electric starter motor
- Freshwater cooling system
- Compatible YX-30 marine gearbox
- Engine instrument panel
- Flexible engine mounts
- Selected wiring and installation accessories
The marine gearbox, alternator, exhaust components, shaft coupling, and additional installation accessories must be specifically confirmed in the quotation.
Warranty: Applicable manufacturer or seller warranty coverage depends on the engine’s condition, production year, and supply arrangement. Full terms will be confirmed before purchase.
Frequently Asked Questions
How Much Power Does the Yanmar 4CHE3 Produce?
The M-rated Yanmar 4CHE3 delivers 78 metric HP (approximately 57.4 kW) at 2,550 RPM.
What Is the Difference Between the 78 HP and 85 HP Versions?
The 78 HP version corresponds to the M-rating at 2,550 RPM, while the 85 HP version corresponds to the L-rating at 2,600 RPM.
What Is the Displacement of the Yanmar 4CHE3?
The engine has a displacement of 4.33 litres.
Is the Yanmar 4CHE3 Turbocharged?
No. The 4CHE3 is a naturally aspirated four-cylinder diesel engine.
Which Marine Gearbox Is Compatible?
The Yanmar YX-30 hydraulic marine gearbox is a documented transmission option. The appropriate reduction ratio depends on the vessel.
Is the Yanmar 4CHE3 Suitable for Repowering?
Yes. It can be used for compatible repowering projects, provided the engine mounts, shaft alignment, transmission, propeller, cooling system, and exhaust installation are correctly matched.
Buy the Yanmar 4CHE3 78HP from JB Marine GmbH
Looking for a Yanmar 4CHE3 78HP diesel marine inboard engine for sale?
JB Marine GmbH provides quotations for Yanmar marine diesel engines, compatible marine 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 4CHE3 78HP quotation today.
Website: https://jbmarinegmbh.de/
