2027 Mercury Marine Mercury Diesel 320 HP

Mercury Diesel 4.2L

Durable and Powerful

Designed for sterndrive and inboard applications.

Diesel advantages

Easy ownership

Top-mounted fluid reservoirs, a self-draining oil filter and an easy-to-reach oil dipstick keep maintenance and service simple.

Reduced weight

With exceptional power-to-weight ratios, Mercury diesel engines pack big-time propulsion in a lightweight package. The difference: quicker acceleration, faster planing, and easier handling.

Durability

Durability and reliability are in the details, like thermostatically controlled closed-cooling systems and advanced corrosion resistance. Our diesel engines are designed to go the distance.

Efficiency

Mercury diesel engines run clean and run easy, without the harshness or fumes from traditional diesels. They can also deliver up to 50% better fuel efficiency compared to gas engines of the same horsepower. 

SmartCraft® The power to do more

SmartCraft® is a full suite of digital technologies, fully integrated and totally coordinated. Gauges, sensors, vessel systems, computer-controlled features – one total package, one high level of control. Make your boating experience easier, safer and a lot more enjoyable.

Digital Throttle & Shift

Digital Throttle & Shift (DTS) controls deliver silky-smooth shifting and instant throttle response, with zero hesitation. Integrated controls for selecting SmartCraft technologies make boating even easier.

VesselView

VesselView brings your engine’s stats and digital controls to your fingertips. For convenient access, VesselView Mobile® displays real-time engine data on mobile devices. VesselView Link and SmartCraft Connect integrate performance data onto compatible displays from Lowrance®, Simrad®, Garmin® and Raymarine®

Joystick piloting

Intuitive joystick controls provide digital anchoring at the touch of a button and 360̊ manoeuvrability in tight spaces when you need it most. In open water, the Auto Heading and Route features let you lock in your course for simplified control.

Active Trim

With just a push of a button, Active Trim automatically optimises trim levels, adapting on the fly to turns, hole shots and water conditions to ensure smooth, efficient trips.

Features may include:

Quiet Ride

• The high-pressure common-rail fuel-injection system not only ensures fuel economy, it also minimises Noise, Vibration and Harshness (NVH), along with smoke and odor – the undesirable factors many boaters associate with yesterday’s diesels.

Peak Performance

• Impressive acceleration and quick throttle response are delivered by the proven common-rail fuel system, which incorporates a turbocharger and seawater after-cooler. These engines combine smooth performance with key diesel advantages, such as high torque and optimum fuel economy.

Corrosion-Resistance

• Mercury diesels feature state-of-the-art anti-corrosion, including a thermostatically controlled closed water-cooled system. Water-cooled engine oil, gear oil and steering fluid decrease engine-room temperatures, extending engine life. The SeaCore® system is available for the ultimate in saltwater protection.

Repower Reasons

• The lightweight, compact design of these diesel engines makes them ideal drop-in replacement power packages for many older, fuel-guzzling petrol engines. Mercury’s full range of drives offers outstanding versatility to owners of sterndrive-powered boats.

Intuitive Design

• DTS controls enhance the performance of Mercury propulsion systems by providing smooth shifting and instant throttle response, with zero hesitation.