The Yanmar 4LH Series is an established four-cylinder marine diesel engine range developed for light-duty commercial vessels, fishing boats, cruisers and other applications requiring compact inboard power. These mechanically controlled engines combine direct fuel injection, turbocharging, intercooling and freshwater cooling to provide dependable propulsion in demanding marine environments.

The series includes the Yanmar 4LHA-HTP, rated at 160 MHP, the Yanmar 4LHA-DTP, rated at 200 MHP, and the Yanmar 4LHA-STP, rated at 240 MHP. Each model has a 3.455-litre displacement and a rated engine speed of 3,300 rpm, allowing buyers to compare three power levels within a similar four-cylinder engine platform. These specific model names can also support direct access to the relevant engine product listings.

Selecting the correct Yanmar 4LH marine engine requires the vessel’s displacement, hull form, required cruising speed and operating duty to be reviewed. Yanmar developed the newer 4LV range to replace the 4LH and 4/6BY families, so buyers should confirm whether a listed 4LH engine is new-old stock, used, rebuilt or remanufactured. For a Yanmar 4LH repower, the engine footprint, mounts, shaft alignment, exhaust routing, cooling connections and propeller demand must be checked carefully.

A Yanmar 4LH engine and gearbox package may be configured for shaft drive with a compatible Kanzaki or ZF marine transmission, while model-specific documentation also covers prepared-for-sterndrive arrangements. Gearbox compatibility and reduction ratio must be verified for the exact engine, vessel and propeller. The quotation should identify whether the package includes the marine gear, engine mounts, control panel, wiring harness, exhaust elbow, 12-volt alternator and other required accessories.

When requesting a Yanmar 4LH engine for sale, provide the exact model required, vessel type, current engine and transmission, desired gear ratio, propeller specifications, operating duty, installation dimensions and delivery destination. The offer should confirm the engine’s condition, rated output, serial-number availability, gearbox configuration, included components, test documentation, warranty, lead time, packing method and delivery terms.