The Yanmar 4JHYE Series provides compact diesel propulsion for commercial marine applications requiring dependable mechanical performance. The 4JHYE features a four-cylinder configuration, direct-injection combustion system and naturally aspirated air intake. Its heat-exchanger cooling arrangement makes it suitable for fishing vessels, workboats and displacement craft when correctly matched to the vessel’s hull, operating duty and propulsion requirements.

The Yanmar 4JHYE marine engine has a displacement of 1.644 litres and is available with published outputs of 25.7 kW (35 MHP) at 3,400 rpm and 29.4 kW (38 MHP) at 3,600 rpm, depending on the applicable rating. Operators requiring lower output can also compare the Yanmar 3JH25A and Yanmar 3JH30A, which are part of Yanmar’s commercial JH engine range and provide rated outputs of 25 PS and 30 PS respectively.

Selecting the correct Yanmar JH Series engine requires the vessel’s displacement, hull type, intended cruising speed and operating schedule to be assessed. The 3JH25A, 3JH30A and 4JHYE do not provide identical power, dimensions or installation configurations, so selection should be based on the vessel’s actual propulsion demand. For repower projects, engine mounts, shaft alignment, propeller demand, exhaust routing, cooling connections and available machinery-space dimensions must also be verified.

A Yanmar 4JHYE engine and gearbox package may include a compatible hydraulic marine transmission, depending on the proposed configuration. Yanmar’s published 4JHYE dimensions and dry weight are based on an engine fitted with the YX-10 gearbox, so these figures should not be applied to every package without confirmation. The quotation should clearly identify the gearbox model, reduction ratio, engine mounts, control panel, wiring harness, exhaust components and other included accessories.

When requesting a Yanmar 4JHYE for sale, provide the vessel type, current engine and gearbox model, required operating duty, shaft details, propeller specifications, installation dimensions and delivery destination. The offer should confirm the exact power rating, engine condition, gearbox and ratio, included components, exclusions, warranty, availability, packing method and delivery terms.