ENGINES, TRANSMISSIONS & PROPULSION
California Approves Low-Emissions Marine Engines
A German original engine manufacturer has gained approval for its marine heavy-duty and medium-duty engines from the California Air Resources Board and introdued a new four-stroke engine for demanding marine applications.
On the US West Coast, the California Air Resources Board (CARB) has approved use of a series of four-stroke, high speed diesel engines, with aſtertreatment systems, for marine heavy-duty and medium-duty applications.
MAN Engines said it is the first manufacturer to offer certified V12 engines that meet the highest level of CARB’s Commercial Harbour Craſt (CHC) regulation, as it also introduced a new variant for low-emissions vessel propulsion.
Its engines can meet demanding emissions requirements under these regulations, which came into effect in 2023, by connecting them to aſtertreatment systems such as a selective catalytic reduction unit (SCR) and a diesel particulate filter (DPF).
MAN Engines said its engines are equipped and certified with DPF and SCF as part of a fully integrated exhaust gas aſtertreatment system from the factory under CARB’s certification.
This combination also complies with US Environmental Protection Agency’s Tier 4, IMO Tier III emissions standards and European Union’s Stage V regulation.
MAN Engines said four V12 variants of the MAN D2862 are available immediately for marine applications complying with CARB’s CHC in-use performance standard.
Its D2862 LE43B (producing 882 kW of power) and D2862 LE48B (1,066 kW) are for medium-duty applications, and D2862 LE44A (735 kW) is for heavy-duty applications.
At the start of 2026, MAN Engines introduced D3872 LE437 engines with 919 kW of power for heavy-duty, demanding marine applications.
MAN Engines said when using the SCR and DPF, particulate matter can be as low as 0.0067 g/kWh and NOx at just 1.8 g/kWh for all variants to comply with CARB requirements.
According to CARB, the revised CHC regulation will lead to an 89% reduction in diesel soot particles and a 52% reduction in NOx from marine activities by 2035.
MAN is already providing its CARB approved engines for vessels in California including four of its D2862 LE48B, each with 882 kW of power, on ferries Karl and Zalophus built by Mavrik Marine for sailings in the San Francisco Bay area.
Twin D2862 LE43B engines have also been supplied for research vessel North Wind built by All American Marine for California’s Polytechnic University and will be installed on El Escudo, a passenger ship being built for Harbor Breeze Cruises.
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www.dockyard-mag.com | March Issue 2026
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