Status

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Tier 3 emissions standards for Category 1 and Category 2 commercial marine diesel engines were introduced between 2009 and 2014; Tier 4 standards were introduced from the 2014 model year, for engines with a maximum engine power equal to or higher than 600 kW. Category 3 engine NO_X emissions are governed by the EPA Tier 1, 2 and 3 emissions standards, which are consistent with the International Maritime Organization standards.

The current recreational marine spark ignition engines standards have been in place since the 2010 model year and they are configured separately for outboard and sterndrive / inboard engines. 

Emissions standards - commercial engines

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• Overview and applicability
• Categories 1 and 2 emissions standards
• Tier 4 standards amendments
• Not-to-exceed standards
• Averaging, banking and trading
• Category 3 emissions standards

Overview and applicability

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Categories 1 and 2 emissions standards

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Tier 4 standards amendments

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Not-to-exceed standards

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Averaging, banking and trading

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Category 3 emissions standards

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Emissions standards - recreational engines

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• Compression ignition engines
• SI outboards and personal watercraft
• SI sterndrive and inboard engines
• Evaporative emissions

Compression ignition engines

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SI outboards and personal watercraft

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SI sterndrive and inboard engines

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Evaporative emissions

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Test Procedures - commercial engines

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• SI engines
• CI engines

SI engines

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CI engines

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Test Procedures - recreational engines

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• SI engines
• CI engines

SI engines

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CI engines

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Historical Data

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• Tier 3 and Tier 4, Category 2, model years 2012-2015
• Tier 2
• Recreational Marine

Tier 3 and Tier 4, Category 2, model years 2012-2015

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Tier 2

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Recreational Marine

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References

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