Cummins QSB6.7 – Marine Diesel Engine 250 HP

Description

With 249 hp at 2400 rpm, the John Deere 6068TFM75 is an inline six-cylinder, four-stroke marine diesel engine with 6.8 L displacement. Turbocharging and mechanical-governed unit injection are specified, together with ULSD diesel fuel. The SAE 3 flywheel housing, shaft-drive compatibility, and listed ZF or Twin Disc transmission compatibility make drivetrain selection and machinery-space planning central to this propulsion-engine installation.

The engine has a 730 kg dry weight, 27 L coolant capacity, and full-pressure lubrication with 19 L oil capacity. A water-cooled exhaust manifold is specified, while the cooling configuration is listed as heat exchanger or keel cooled. Electrical options include a 12V, 75-amp alternator or a 24V, 50-amp alternator, which must be matched to the vessel electrical system.

Key Specifications of the John Deere 6068TFM75 Marine Diesel Engine

• The inline six-cylinder four-stroke engine displaces 6.8 L, defining the stated diesel architecture for a shaft-drive marine propulsion installation.
• Rated output is 249 hp, or 186 kW, at 2400 rpm for drivetrain, propeller, and transmission-matching decisions.
• Turbocharging works with mechanically governed unit injection, requiring an ULSD diesel fuel supply for the listed fuel-system configuration.
• An SAE 3 flywheel housing supports listed ZF or Twin Disc transmission compatibility during propulsion-system specification and installation planning.
• The heat-exchanger or keel-cooled configuration works with a water-cooled exhaust manifold, defining the stated cooling and exhaust options.
• Alternator choices include 12V at 75 amps or 24V at 50 amps, requiring electrical-system selection before engine installation.
• Dry weight is 730 kg, establishing a stated load for engine-bed design, lifting requirements, and vessel trim planning.

Engine, Cooling, and Electrical Planning

This John Deere marine diesel engine has a 106 x 127 mm bore-and-stroke specification, a 17.0:1 compression ratio, and firing order 1-5-3-6-2-4. The 6.8 L six-cylinder architecture and 249 hp rating distinguish it from smaller propulsion packages. Mechanical and hydraulic steering compatibility is listed for control-system planning.

Cooling-system selection must account for the listed heat-exchanger or keel-cooled configuration and the water-cooled exhaust manifold. The 27 L coolant capacity and 19 L oil capacity establish service-fluid requirements, while the 12V or 24V alternator option should be selected to match the vessel’s existing electrical architecture.

Why Choose the John Deere 6068TFM75 Marine Diesel Engine

The 6068TFM75 marine diesel engine provides a 249 hp output at 2400 rpm from a turbocharged 6.8 L inline six-cylinder configuration. Its SAE 3 flywheel housing, shaft-drive compatibility, ZF or Twin Disc transmission compatibility, heat-exchanger or keel-cooling options, water-cooled exhaust manifold, and selectable 12V or 24V alternator output give buyers defined parameters for a larger inboard propulsion installation.

Installation and Service Considerations

Confirm engine-bed capacity, available machinery-space clearance, and lifting provisions for the 730 kg dry weight before installation. Match the SAE 3 flywheel housing with a compatible ZF or Twin Disc transmission, then plan shaft alignment and propeller selection. Select the heat-exchanger or keel-cooling approach, route the water-cooled exhaust manifold connections, and choose the 12V or 24V alternator configuration before completing electrical-system integration.

Warranty and Support

John Deere marine engines carry a 2-year or 2,000-hour standard warranty, subject to the manufacturer’s applicable warranty terms and conditions. Mulmarine.com provides product-information support before purchase and assistance with order-related questions. Review warranty eligibility and current coverage details on Mulmarine.com before placing your order.

Before Ordering the John Deere 6068TFM75 Marine Diesel Engine

Verify that your vessel supports the 730 kg dry weight, 249 hp at 2400 rpm output, 6.8 L six-cylinder layout, SAE 3 flywheel housing, and shaft-drive installation. You should confirm ZF or Twin Disc transmission compatibility, cooling configuration, water-cooled exhaust routing, ULSD fuel supply, 27 L coolant capacity, 19 L oil capacity, and the required 12V or 24V charging arrangement.