Using its established IMO Tier III technology, Volvo Penta will begin supplying four-stroke D8 and D13 engines for diesel inboard, marine genset and auxiliary applications that comply with EU Stage V emissions regulations.

The Swedish engine builder will be able to supply diesel engines rated below 300kW with after-treatment systems that comply with stricter European emissions regulations. Adopted by the European Parliament in July 2016, the Stage V emission limits came into force as of 1 January 2019. These standards require stricter limits on emissions of particulate matter on engines equal to or greater than 37kW used for inland waterway vessels for propulsion and engines greater than 560kW used on inland waterway vessels for auxiliary power.
In the power range below 300kW, the Volvo Penta D8 and D13 engines use selective catalytic reduction (SCR) technology in order to meet the stricter emissions standards. Volvo Penta says the diesel engines are designed to cope with high back pressure and high-sulphur fuel and this ensures high engine power and efficiency while simultaneously reducing NOx.
The SCR technology is the result of development work across the entire Volvo Group, including both highway and marine. To meet the IMO Tier III and EU Stage V regulatory requirements, the SCR solutions have been specifically adapted to commercial marine conditions. They have been tested at Volvo Penta’s own facilities and through customer applications, accumulating some 35,000 hours in operation.
The SCR unit has been designed to give the options of being mounted on the engine, on the engine room ceiling, or at floor level, solutions that give a shipyard flexible options for after-treatment installation. With their SCR technology, diesel exhaust fluid (DEF) is infused into the exhaust and gases are mixed inside the SCR unit with the ammonia content of the DEF/urea, transforming the NOx into nitrogen and water.
For marine genset applications, Volvo Penta will begin supplying two versions of the in-line, six-cylinder common-rail D8 MG IMO Tier III/EU Stage V diesel and D13 MG IMO Tier III/EU Stage V diesel, covering 50Hz at 1,500rpm and 60 Hz at 1,800rpm. The engines will also be available as marine auxiliary engines, both in variable speed and constant speed models.
By Dag Pike