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Engine Testing Regulations
The U.S. Environmental Protection Agency (EPA) has adopted emission standards for almost every kind of engine, for everything from lawn mowers to cruise ships. To show compliance with these emission standards, engine manufacturers must follow test procedures specified in the Code of Federal Regulations. This page provides links to the appropriate regulatory citations and includes published information related to proposed or final rules for changed test procedures. These links include a full set of instructions and requirements for manufacturers certifying their engines to EPA emission standards.
The long-term plan is for all types of engines to follow the procedures
in 40 CFR part 1065. Vehicle manufacturers must follow a different
set of specified test procedures, as described in 40
CFR part 86, subpart B. 
The following table shows which test procedures apply for each category of engines:
| Engine Category | Code of Federal Register Citation |
| Heavy-Duty Highway Engines | 40 CFR part 86, subpart N (through 2009) 40 CFR part 1065 (optional through 2009, mandatory starting in 2010) |
| Locomotives | 40 CFR part 92, subpart B |
| Marine Diesel Engines (Diesel Boats and Ships) | 40 CFR part 94, subpart B |
| Other Nonroad Diesel Engines |
40
CFR part 89, subparts D and E (Tier 3 and earlier) |
| Recreational Vehicles (Snowmobiles, Dirt Bikes and ATVs) | 40 CFR part 1065 |
| Marine Spark-Ignition Engines (Gasoline Boats and Personal Watercraft) | 40 CFR part 91, subparts D and E |
| Other Nonroad Spark-Ignition Engines at or below 19kW (Lawn and Garden) | 40 CFR part 90, subparts D and E |
| Other Nonroad Spark-Ignition Engines above 19 kW (Forklifts, Generators and Compressors) | 40 CFR part 1065 |
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Regulations
Final Rule - Test Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments (published July 13, 2005)
- Fact Sheet: "Regulatory Announcement: Changed Test Procedures for Nonroad Engines and Heavy-Duty Highway Engines" (also available as a PDF file) (4 pp, 134K, EPA420-F-05-036, July 2005)
- Federal Register Notice: Entire
Document (also available as a PDF
file) (194 pp, 7.4MB)
- Preamble and 40 CFR Parts 85-94 (PDF), pages 40419-40462 (43 pp, 762K)
- 40 CFR Parts 1039, 1048, 1051, and 1068 (PDF), pages 40462-40516 (55 pp, 986K)
- 40 CFR Part 1065 (PDF), pages 40516-40612 (97 pp, 8.6MB)
- Technical Support Document and Summary & Analysis of Comments (PDF) (115 pp, 1.7MB, EPA420-R-05-008, June 2005)
- Fact Sheet: "Proposed Changes to Test Procedures for Nonroad Engines and Heavy-Duty Highway Engines" (PDF) (3 pp, 104K, EPA420-F-04-046, August 2004)
- Federal Register Notice: "Test Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments" (Entire Document, 171 pages, 1.8M)
- Technical Support Document: "Test Procedures for Highway and Nonroad Engines and Omnibus Technical Amendments" (PDF) (70 pp, 808K, EPA420-D-04-004, August 2004)
- Part
B: Preamble excerpt including Section III.G--Other Test Procedure
Issues, pages 39007-39056 (also available as a PDF file) (50 pp, 544K)
- Part G: Regulation excerpt including Part 1065, pages 39257-39273 (also available as a PDF file) (17 pp, 267K)
For further information or assistance regarding this web page, please contact Alan Stout, phone: (734) 214-4805 or email: stout.alan@epa.gov.