4JH45
4-cylinder naturally aspirated common rail engine delivering reliable mid-range performance for sailing yachts and motor vessels.
Specifications
Rated Output
45 MHP (33.1 kW)
Displacement
2.19L
Cylinders
4 cylinders
Bore x Stroke
84 mm x 98 mm
Compression Ratio
19.7:1
Max RPM
3000 rpm
Alternator
12V 125A
Dry Weight
220 kg
Dimensions (L x W x H)
810 x 526 x 650 mm
Fuel Consumption
10.5 L/hr @ full load
Fuel System
Bosch common rail direct injection
Cooling
Fresh water cooling with heat exchanger
Transmission
KMH4A reverse gear or SD50 saildrive
Specifications are indicative and may vary by configuration, drive option and model year. Contact us to confirm exact figures for your application against the latest Yanmar datasheet.
Key Features
Typical Applications
Why Choose the 4JH45?
The 4JH45 is a mid-range 2.19L 4-cylinder marine engine, well suited to sailing yachts, motor yachts, commercial vessels.
Proven Reliability
Backed by over 100 years of Yanmar engineering excellence. Every engine is built to deliver thousands of hours of dependable operation in the harshest marine environments, giving you complete peace of mind whether cruising Port Phillip Bay or crossing Bass Strait.
Expert Local Service
Mariner Engineering provides factory-trained servicing from our Spotswood workshop. As an authorised Yanmar dealer, we carry genuine parts in stock and offer scheduled maintenance programs and warranty servicing for boat owners across Melbourne and beyond.
Fuel Efficiency
Designed for maximum fuel efficiency, keeping your running costs low while delivering reliable performance. The compact design means less weight and more usable space in your engine bay, which translates directly to better fuel economy on every voyage.
The 4JH45 is a testament to Yanmar's commitment to producing the world's finest compact diesel engines. Founded in 1912, Yanmar pioneered the small diesel engine and has been at the forefront of marine propulsion innovation ever since. The 4JH45 delivers 45 MHP from a 2.19L, 4-cylinder configuration, offering an exceptional power-to-weight ratio.
Yanmar engines are manufactured in Japan using precision engineering processes that ensure exceptional build quality and long service life. The 4JH45 features advanced noise and vibration damping for a quieter, more comfortable experience on the water. With a global dealer network and comprehensive parts availability through Power Equipment Australia, owning a Yanmar means you'll never be far from expert support.
As Melbourne's trusted Yanmar dealer, Mariner Engineering can help you select the right engine configuration for your vessel, provide professional installation, commission the engine to factory specifications, and support you with ongoing maintenance throughout the life of your boat. Contact our team to discuss how the 4JH45 can transform your boating experience.
Authorised Yanmar dealer
Genuine factory products, warranty and back-up — not a grey importer.
Factory-trained technicians
Diagnostics, servicing and commissioning from our Spotswood, Melbourne workshop.
Genuine parts in stock
OEM parts and consumables on the shelf to keep your boat on the water.
Supply, install & support
Repower specialists serving boat owners across Port Phillip Bay and beyond.
Other engines in the JH-CR Series
View full Yanmar range
New generation 3-cylinder common rail engine with electronic fuel injection delivering smooth, efficient power for sailing and motor yachts.
High-performance 4-cylinder naturally aspirated engine with advanced Bosch common rail injection, delivering outstanding power and efficiency.
Turbocharged 4-cylinder common rail engine delivering strong performance for larger sailing yachts and motor vessels with shaft and sail drive options.
Top-of-range turbocharged JH engine delivering maximum power from the compact 2.19L platform for demanding applications.
Enquire About the 4JH45
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Complete Service & Support
Every 4JH45 from Mariner Engineering comes with access to our full service workshop in Spotswood, Melbourne. We offer scheduled maintenance, warranty servicing, genuine Yanmar parts, repowering, and expert technical support for boat owners across Port Phillip Bay and beyond.