Marinediesel Sweden AB has always been at the front of current and future emissions regulations. All engines are designed with environmental concerns in mind while maintaining simple mechanical control and serviceability.


In effect in Europe from January 1st 2006. Only applies to Pleasure craft marine propulsion engines.


The international Maritime Organisation has issued regulation 13 to Annex VI of Marpol 73/78 which entered into effect on January 1, 2000 for diesel engines above 130 KW (175hp) installed on a ship.

The International Maritime Organization (IMO) is an agency of the United Nations which has been formed to promote maritime safety. It was formally established by an international conference in Geneva in 1948, and became active in 1958 when the IMO Convention entered into force (the original name was the Inter-Governmental Maritime Consultative Organization, or IMCO, but the name was changed in 1982 to IMO). IMO currently groups 167 Member States and 3 Associate Members.

IMO ship pollution rules are contained in the “International Convention on the Prevention of Pollution from Ships”, known as MARPOL 73/78. On 27 September 1997, the MARPOL Convention has been amended by the “1997 Protocol”;, which includes Annex VI titled “Regulations for the Prevention of Air Pollution from Ships”. MARPOL Annex VI sets limits on NOx and SOx emissions from ship exhausts, and prohibits deliberate emissions of ozone depleting substances.

The IMO emission standards are commonly referred to as Tier I…III standards. The Tier I standards were defined in the 1997 version of Annex VI, while the Tier II/III standards were introduced by Annex VI amendments adopted in 2008, as follows:

  • 1997 Protocol (Tier I)—The “1997 Protocol” to MARPOL, which includes Annex VI, becomes effective 12 months after being accepted by 15 States with not less than 50% of world merchant shipping tonnage. On 18 May 2004, Samoa deposited its ratification as the 15th State (joining Bahamas, Bangladesh, Barbados, Denmark, Germany, Greece, Liberia, Marshal Islands, Norway, Panama, Singapore, Spain, Sweden, and Vanuatu). At that date, Annex VI was ratified by States with 54.57% of world merchant shipping tonnage.Accordingly, Annex VI entered into force on 19 May 2005. It applies retroactively to new engines greater than 130 kW installed on vessels constructed on or after January 1, 2000, or which undergo a major conversion after that date. The regulation also applies to fixed and floating rigs and to drilling platforms (except for emissions associated directly with exploration and/or handling of sea-bed minerals). In anticipation of the Annex VI ratification, most marine engine manufacturers have been building engines compliant with the above standards since 2000.
  • 2008 Amendments (Tier II/III)—Annex VI amendments adopted in October 2008 introduced (1) new fuel quality requirements beginning from July 2010, (2) Tier II and III NOx emission standards for new engines, and (3) Tier I NOx requirements for existing pre-2000 engines.The revised Annex VI enters into force on 1 July 2010. By October 2008, Annex VI was ratified by 53 countries (including the Unites States), representing 81.88% of tonnage.

Emission Control Areas. Two sets of emission and fuel quality requirements are defined by Annex VI: (1) global requirements, and (2) more stringent requirements applicable to ships in Emission Control Areas (ECA). An Emission Control Area can be designated for SOx and PM, or NOx, or all three types of emissions from ships, subject to a proposal from a Party to Annex VI.

Existing Emission Control Areas include:

  • Baltic Sea (SOx, adopted: 1997 / entered into force: 2005)
  • North Sea (SOx, 2005/2006)
  • North American ECA, including most of US and Canadian coast (NOx & SOx, 2010/2012).
  • US Caribbean ECA, including Puerto Rico and the US Virgin Islands (NOx & SOx, 2011/2014).

Greenhouse Gas Emissions. 2011 Amendments to MARPOL Annex VI introduced mandatory measures to reduce emissions of greenhouse gases (GHG). The Amendments added a new Chapter 4 to Annex VI on “Regulations on energy efficiency for ships”.


On January 1, 2004, emissions regulations mandated by the EPA entered into effect for new commercial marine diesel engines installed on a vessels flagged or registered in the United States. The EPA has set forth two Tiers of standards with a phased implementation based on per cylinder displacement. Tier 1 emission standards are set at the same level as Annex VI of MARPOL 73/78 (IMO), and regulate levels of Nitrogen Oxides (NOx). Tier 1 applies to all commercial propulsion and auxiliary diesel engines with a displacement above 2.5 liters per cylinder.

The more stringent Tier 2 standards entered into effect on January 1, 2004 for marine diesel engines with a displacement of 0.9 up to 2.5 liters per cylinder. Tier 2 regulates not only NOx, but also Hydrocarbons (HC), Carbon Monoxide (CO), and Particulate Matter (PM). Engines with a displacement of less than 0.9 liters per cylinder will be required to comply with Tier 2 standards beginning January 1, 2005 and engines at or above 2.5 liters per cylinder will be required to comply with Tier 2 standards beginning January 1, 2007.

2009 Category 3 Engine Rule—On December 18, 2009, the EPA signed a new emission rule for Category 3 engines (published April 30, 2010), which introduced Tier 2 and Tier 3 standards in harmonization with the 2008 Amendments to IMO MARPOL Annex VI.

To download the complete Annex VI text, right click and “save as” below:

Annex VI

Not all regulations apply to every engine, rating or application. Other local certifications may be available. Consult your local Marinediesel representative for more information on current emissions


Download Marinediesel Emissions Certificates (Right click and “Save as” PDF)

VGT Series

MARINEDIESEL-94-25-0050-00-00 (EU)

MARINEDIESEL-94-25-0050-00-00-APP-01 (EU)

marinedieselswe_CmrdN06.6VGT_mrd-MCI-12-03_COC (EPA)

marinedieselswe_CMRDW06.6VGT_MRD-IMO-12-03_ (EPA)

COCmarinedieselswe_DMRDW06.6VGT_MRD-IMO-13-01_COC (EPA)

marinedieselswe_EmrdN06.6VGT_mrd-MCI-14-01.1_COC (EPA)

marinedieselswe_FMRDN06.6VGT_MRD-MCI-15-01_COC (EPA)

EIAPP marinedieselswe_DMRDW06.6VGT_MRD-IMO-13-01_COC (EPA)


MD Series

MarinedieselSwe_BMRDW06.5NA2_MRD-IMO-11-01_COC (EPA)

MarinedieselSwe_BMRDW06.5SC3_MRD-IMO-11-02_COC (EPA)

marinedieselswe_CMRDW06.5NA2_MRD-IMO-12-01_COC (EPA)

marinedieselswe_CMRDW06.5SC3_MRD-IMO-12-02_COC (EPA)

MD-2003-44-20003-00-MD-SC (EU)

MD-2003_44-20002-00-MD-NA (EU)