Ocean Marine Services Products

We support, advise and supply a wide range of Volvo Penta and Yanmar engines and parts, backed by strong product knowledge and industry experience. Whether you’re maintaining, repairing or upgrading, we can help you find the right solution quickly and reliably.

Whatever your engine specification or part requirement, please contact us and our team will be happy to assist.

Yanmar 4JH45

1 kW = 1.3596 mhp = 1.34102 bhp Fuel condition: density at 15°C = 0.842 g/cm³ Technical data is according to (ISO 8665) / (ISO 3046) Fuel temperature 40°C at the inlet of the fuel injection pump (ISO 8665) Length includes KM35P marine gear (Dimensions may vary with other gears/elbow)

Product Description

MARINE-DESIGNED COMMON RAIL POWER

The Yanmar 4JH45 marine diesel engine is engineered for sailboats, yachts, and light commercial craft where refined performance and efficiency are essential. Its advanced common rail fuel system delivers smooth, responsive power suited to both cruising and daily use.

SMOOTH, EFFICIENT 45 HP PERFORMANCE

At 45 mhp (33.1 kW) @ 3000 rpm, the 4JH45 balances strong torque delivery with economical fuel consumption. The Bosch common rail direct injection system provides precise combustion control for responsive throttle behaviour, improved fuel efficiency, and lower exhaust emissions across operating conditions.

ENGINEERED FOR MARINE RELIABILITY

Built on Yanmar’s proven diesel architecture, this four-cylinder, water-cooled engine features robust construction optimised for continuous marine operation. Its freshwater cooling system and corrosion-resistant design ensure dependable thermal management and long-term durability in saltwater environments.

QUIET & COMFORTABLE OPERATION

Advanced combustion and balanced engine dynamics result in low vibration and reduced noise essential for onboard comfort during extended cruising or harbour manoeuvring.

COMPLIANT & ENVIRONMENTALLY MINDFUL

The engine meets stringent emissions regulations, including EPA Tier 3 and EU RCD standards, delivering cleaner operation without compromising performance.