Installation manual

1-49
90-898305
The responsibilities listed above are general, and are in no way a complete
listing of the rules and regulations pertaining to the EPA laws on exhaust
emissions for marine products. For more detailed information on this subject,
you may contact the EPA at the following locations:
VIA U.S. POSTAL SERVICE:
Office of Mobile Sources
Engine Programs and Compliance Division
Engine Compliance Programs Group (6403J)
401 M St. NW
Washington, DC 20460
VIA EXPRESS or COURIER MAIL:
Office of Mobile Sources
Engine Programs and Compliance Division
Engine Compliance Programs Group (6403J)
501 3rd St. NW
Washington, DC 20001
EPA INTERNET WEB SITE:
http:/www.epa.gov/omswww
Exhaust Emissions Standards
Through the Environmental Protection Agency (EPA), the federal government
has established exhaust emissions standards for all new marine engines sold
in the U.S.
What Are Emissions?
Emissions are what comes out of the exhaust system in the exhaust gas when
the engine is running. They are formed as a result of the process of
combustion or incomplete combustion. To understand exhaust gas emissions,
remember that both air and fuel are made of several elements. Air contains
oxygen and nitrogen among other elements; gasolene contains mainly
hydrogen and carbon. These four elements combine chemically during
combustion. If combustion were complete, the mixture of air and gasoline
would result in these emissions: water, carbon dioxide and nitrogen, which are
not harmful to the environment. But combustion is not usually complete. Also,
potentially harmful gases can be formed during and after combustion.
All marine engines must reduce the emission of certain pollutants, or
potentially harmful gases, in the exhaust to conform with levels legislated by
the EPA. Emissions standards become more stringent each year. Standards
are set primarily with regard to three emissions: hydrocarbons (HC), carbon
monoxide (CO) and oxides of nitrogen (NOx).
Notes
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