Status
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For non-road diesel applications such as generator sets and construction equipment, final Tier 4 standards became effective from the 2015 model year. Large non-road spark ignition engines are subject to Tier 2 regulations, which have been in place since 2007. Recreational vehicles, comprising snow mobiles, off-highway motorcycles, all terrain vehicles (ATVs) and some utility vehicles, are certified under separate standards. Small spark-ignition engine regulations are also in place, and, currently, Phase 3 standards apply. Commercial and recreational marine engines are covered in the separate US Federal - Marine entry.
Federal Regulations
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Non-road diesel engines
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Final Tier 4
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Not-to-exceed (NTE) limits
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Crankcase emissions
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Smoke emissions
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Useful life
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Transport Refrigeration Units
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Non-road large SI engines (>19 kW)
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Applications
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Emissions limits
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Useful life
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Voluntary standards
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Evaporative and crankcase emissions
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Non-road small SI engines ( ≤ 19kW)
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Overview
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Phase 3 - Handheld engines
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Phase 3 - Non-handheld engines
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Phase 3 - Useful life periods
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Evaporative emissions
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Crankcase emissions
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Recreational vehicles
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Introduction
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Snowmobiles
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Off-highway motorcycle and ATVs
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Mines
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Introduction
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Metal and nonmetal mines
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Coal mines
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Test Procedures
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Non-road diesel engines
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Large SI engines
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Small SI engines
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Recreational vehicles
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Historical Data
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Non-road diesel engines
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Interim Tier 4
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References
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