Brand New Cummins 6BTA5.9-M2 250HP Marine Diesel Engine

Cummins 6BTA 250HP Marine Engine for Sale in Australia

Crate Engines Australia supplies the Cummins 6BTA 250HP Marine Engine for compatible marine engine replacements and professionally planned vessel repowers. This brand-new 5.9-litre inline-six diesel combines mechanical fuel injection, turbocharging, aftercooling and marine heat-exchanger cooling in one complete engine package.

The historical model designation is Cummins 6BTA5.9-M2, while many buyers also search for this engine as the 6BTA5.9-M250 or Cummins M250 marine engine. Its reference rating is 186 kW / 250 hp at 2,600 rpm, providing dependable mechanical diesel power for suitable marine applications.

Mechanical 5.9L Turbo Diesel

The Cummins 6BTA uses a conventional mechanical inline injection system rather than a modern common-rail ECU. This makes the engine an attractive option for vessel owners looking for a straightforward, serviceable and proven mechanical marine diesel engine.

The “T” in 6BTA identifies turbocharging, while the “A” identifies the aftercooled configuration. The aftercooler reduces the temperature of the compressed intake air before it enters the engine, supporting the increased airflow and performance required for the 250 hp marine rating.

With six cylinders arranged in line, a 5.9-litre displacement and a 102 mm × 119 mm bore and stroke, the Cummins 6BTA marine engine provides a compact power package for its output. The historical performance specification records rated torque of 684 Nm at 2,600 rpm.

Complete Marine Engine Assembly

This Cummins 6BTA marine engine for sale in Australia is supplied as the complete assembly shown in the product photographs. The package appears to include the mechanical injection equipment, turbocharger, aftercooling system, marine heat exchanger, cooling plumbing, marine intake and exhaust components, starter motor, alternator, filters, flywheel and flywheel housing.

The final written quote and pre-dispatch photographs will confirm exactly what is included with the supplied engine. A marine gearbox, reduction transmission, vessel controls, instrument panel, shaft, propeller and vessel-side installation components are not included unless specifically itemised.

The engine-mounted heat exchanger allows the engine’s closed freshwater cooling circuit to transfer heat to the seawater circuit. This provides a purpose-built marine cooling arrangement without using a conventional automotive radiator.

Suitable for Marine Replacement and Repower Projects

A correctly specified Cummins 6BTA 250HP Marine Engine may be considered for compatible fishing boats, workboats, trawlers, charter vessels, utility craft and other displacement or semi-displacement marine applications.

The historical 6BTA5.9-M2 specification uses a Medium Continuous rating. This permits full output for up to six hours during every 12-hour operating period, with the remaining operation at a reduced speed and load. It is not intended to represent uninterrupted full-load continuous duty.

Engine suitability cannot be determined from vessel length alone. Vessel displacement, hull design, normal operating load, annual operating hours, gearbox ratio, shaft arrangement and propeller demand must all be considered before selecting a replacement or repower engine. 

Marine Fitment Must Be Confirmed

Cummins 6BTA marine engines were manufactured in several ratings and configurations. Two 6BTA 5.9-litre engines may use different CPL numbers, injection calibrations, flywheel housings, sump arrangements, mounts, electrical systems and cooling connections.

Before ordering, please provide:

• A clear photograph of the existing engine data plate

• Engine serial number and CPL or SO number

• Existing horsepower and rated RPM

• Gearbox make, model and reduction ratio

• Required 12V or 24V electrical system

• Engine mount measurements

• Available engine-room dimensions

• Exhaust and cooling connection sizes

• Vessel type, displacement and normal operating duty

• Photographs of the existing installation

Crate Engines Australia will use this information to check the supplied configuration against your existing engine and proposed marine application.

Australia-Wide Supply from Crate Engines Australia

Every engine is supplied brand new with no exchange engine or core return required. Crate Engines Australia provides a one-year limited warranty and free insured shipping Australia-wide, with the engine securely packed for heavy freight.

Our team can assist with engine identification, configuration checks and the information your marine installer will need before installation. Final fitment, cooling, exhaust, alignment, propeller loading and commissioning must be completed by suitably qualified marine professionals.

At approximately 186 kW, this engine is above the 130 kW threshold covered by AMSA’s marine diesel emissions guidance. Relevant installations and major conversions may require a serial-specific EIAPP certificate and Technical File. Buyers should confirm these requirements with their marine surveyor before purchasing.

For pricing, availability and configuration details, contact Crate Engines Australia with your existing engine plate, gearbox information and vessel specifications.

Why Choose the Cummins 6BTA 250HP Marine Engine?