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.
Mercury Diesel 4.2L
Durable and Powerful
Designed for sterndrive and inboard applications.
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Intuitive, innovative features
Quiet Ride
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.
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.
Intuitive Design
DTS controls enhance the performance of Mercury propulsion systems by providing smooth shifting and instant throttle response, with zero hesitation.
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.
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.
Product specifications
Name
Mercury Diesel 270 HP
Mercury Diesel 320 HP
Mercury Diesel 350 HP
Power mhp / kW
270 / 199
320 / 235
350 / 257
Bore and stroke
3.70 x 3.94" / 94 x 100 mm
3.70 x 3.94" / 94 x 100 mm
3.70 x 3.94" / 94 x 100 mm
Maximum RPM (WOT)
3800
3800
3800
Engine type
Inline 6
Inline 6
Inline 6
Displacement (L)
4.2
4.2
4.2
Dimensions (L x W x H)
42 x 30 x 31" / 1077 x 773 x 790 mm
42 x 30 x 31" / 1077 x 773 x 790 mm
42 x 30 x 31" / 1077 x 773 x 790 mm
Weight (engine only)
1014 lbs / 460 kg
1014 lbs / 460 kg
1014 lbs / 460 kg
Weight (incl. transmission)
1111 lbs / 504 kg
1111 lbs / 504 kg
1111 lbs / 504 kg
Weight - Bravo One
1246 lbs / 565 kg
1246 lbs / 565 kg
1246 lbs / 565 kg
Weight - Bravo Two
1261 lbs / 572 kg
1261 lbs / 572 kg
1261 lbs / 572 kg
Weight - Bravo Three
1272 lbs / 577 kg
1272 lbs / 577 kg
1272 lbs / 577 kg
Cooling system
Closed cooling
Closed cooling
Closed cooling
Fuel consumption
16.0 gal/hr / 60.6 l/hr @ 3800 rpm
19.0 gal/hr / 71.9 l/hr @ 3800 rpm
21.5 gal/hr / 81.4 l/hr @ 3800 rpm
Compatible drives
Bravo One X / Bravo Three X / Bravo Two X
Bravo One X and XR / Bravo Three X and XR / Bravo Two X
Bravo One X / Bravo Three X / Bravo Two X
Emission
RCD 2 (BSO 2) / IMO 2 / EPA Tier 2 certified
RCD 2 (BSO 2) / IMO 2 / EPA Tier 2 certified
RCD 1 / IMO 2 / EPA Tier 2 certified