The Yanmar 4JH57 Marine Diesel Engine is a high-performance 4-cylinder, 4-stroke engine, delivering 57hp at 3000 rpm. This advanced marine engine features common rail direct injection (CR) technology, offering exceptional fuel efficiency, power output, and compliance with global emission standards. The 4JH57 is designed for sailboats, yachts, and other vessels that require dependable and efficient propulsion.
The 4JH57 engine integrates common rail fuel injection, providing optimised combustion that reduces noise, vibration, and emissions, making it a smooth and quiet engine for marine applications. It is compliant with EPA Tier 3 and EU RCD Stage II environmental regulations, offering eco-friendly performance without sacrificing power.
The engine is also equipped with a freshwater cooling system via a heat exchanger, which protects the internal components from corrosion and ensures stable operating temperatures. This engine is known for its compact size and light weight, making it ideal for installation in tight engine compartments.
Technical Specifications:
- Engine Model: 4JH57
- Engine Type: 4-cylinder, 4-stroke, vertical water-cooled diesel engine
- Displacement: 2.19 litres (2190 cc)
- Bore x Stroke: 84 mm x 90 mm
- Power Output: 57hp (41.9 kW) at 3000 rpm
- Compression Ratio: 18.9:1
- Fuel System: Common rail direct injection (CR)
- Cooling System: Freshwater cooling with heat exchanger
- Alternator Output: 12V – 125A
- Lubrication System: Forced lubrication by gear pump
- Oil Capacity: 7.4 litres
- Starting System: Electric start
- Direction of Rotation: Counterclockwise (viewed from flywheel)
- Weight: 192 kg (without gearbox)
- Gearbox Options: KM35A, KM4A2 (mechanical or hydraulic)
- Reduction Ratios: 2.14:1, 2.61:1 (KM35A) or 2.20:1, 3.12:1 (KM4A2)
- Exhaust System: Water-cooled, with wet exhaust manifold
- Fuel Consumption: Approx. 7.5 litres/hour at cruising speed
- Emission Compliance: EPA Tier 3, EU RCD Stage II
Key Features:
- Common Rail Direct Injection (CR): Improves fuel efficiency, reduces emissions, and ensures smooth engine operation.
- Freshwater Cooling System: Helps maintain optimal engine temperatures and prevents internal corrosion.
- Low Noise and Vibration: Designed for quieter and more comfortable onboard experiences.
- Environmentally Friendly: Complies with EPA Tier 3 and EU RCD Stage II emissions standards.
- Compact Design: Ideal for installation in boats with limited engine compartment space.
- High Power Output: Provides 57hp for medium to larger sailboats and yachts.
Yanmar is a global leader in marine diesel engines, known for their durability, efficiency, and compliance with environmental standards. The Yanmar 4JH57 is part of the renowned 4JH series, featuring modern common rail technology for enhanced performance and reduced environmental impact.
The Yanmar 4JH57 engine is compatible with several transmission options for marine use. The KM35P and KM4A-2 are robust mechanical marine gearboxes, featuring hydraulic clutch controls and designed for inboard applications, with the KM4A-2 offering servo cone clutches for sailboats. The ZF25A and ZF30M provide additional options, known for their reliability and performance in demanding marine environments. For sailboats, the SD60 SailDrive ensures smooth, vibration-free performance when paired with specific Yanmar engines. Bobtail engines, meanwhile, are fully assembled replacements for stern drive and inboard setups, including all essential systems like fuel, electrical, cooling, and more, for a comprehensive repowering solution.
