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Electronic Code of Federal Regulations

e-CFR data is current as of December 3, 2019

Title 40Chapter ISubchapter UPart 1042Subpart J → Appendix


Title 40: Protection of Environment
PART 1042—CONTROL OF EMISSIONS FROM NEW AND IN-USE MARINE COMPRESSION-IGNITION ENGINES AND VESSELS
Subpart J—Definitions and Other Reference Information


Appendix I to Part 1042—Summary of Previous Emission Standards

The following standards apply to compression-ignition marine engines produced before the model years specified in §1042.1:

(a) Engines below 37 kW. Tier 1 and Tier 2 standards for engines below 37 kW apply as specified in 40 CFR part 89 and summarized in the following table:

Table 1 to Appendix I—Emission Standards for Engines Below 37 kW (g/kW-hr)

Rated power (kW)TierModel yearNMHC + NOXCOPM
kW<8Tier 1200010.58.01.0
   Tier 220057.58.00.80
8≤kW<19Tier 120009.56.60.80
   Tier 220057.56.60.80
19≤kW<37Tier 119999.55.50.8
   Tier 220047.55.50.6

(b) Engines at or above 37 kW. Tier 1 and Tier 2 standards for engines at or above 37 kW apply as specified in 40 CFR part 94 and summarized as follows:

(1) Tier 1 standards. NOX emissions from model year 2004 and later engines with displacement of 2.5 or more liters per cylinder may not exceed the following values:

(i) 17.0 g/kW-hr when maximum test speed is less than 130 rpm.

(ii) 45.0 × N−0.20 when maximum test speed is at or above 130 but below 2000 rpm, where N is the maximum test speed of the engine in revolutions per minute. Round the calculated standard to the nearest 0.1 g/kW-hr.

(ii) 9.8 g/kW-hr when maximum test speed is 2000 rpm or more.

(2) Tier 2 primary standards. Exhaust emissions from Category 1 engines at or above 37 kW and all Category 2 engines may not exceed the values shown in the following table:

Table 2 to Appendix I—Primary Tier 2 Emission Standards for Commercial and Recreational Marine Engines at or Above 37 kW (g/kW-hr)

Engine size
liters/cylinder
Maximum engine powerCategory Model
year
NOX + THC
g/kW-hr
CO
g/kW-hr
PM
g/kW-hr
disp. <0.9power ≥37 kWCategory 1 Commercial20057.55.00.40
   Category 1 Recreational20077.55.00.40
0.9 ≤disp. <1.2AllCategory 1 Commercial20047.25.00.30
   Category 1 Recreational20067.25.00.30
1.2 ≤disp. <2.5AllCategory 1 Commercial20047.25.00.20
   Category 1 Recreational20067.25.00.20
2.5 ≤disp. <5.0AllCategory 1 Commercial20077.25.00.20
   Category 1 Recreational20097.25.00.20
5.0 ≤disp. <15.0AllCategory 220077.85.00.27
15.0 ≤disp. <20.0power <3300 kWCategory 220078.75.00.50
   power ≥3300 kWCategory 220079.85.00.50
20.0 ≤disp. <25.0AllCategory 220079.85.00.50
25.0 ≤disp. <30.0AllCategory 22007115.00.5

(3) Tier 2 supplemental standards. The not-to-exceed emission standards specified in 40 CFR 94.8(e) apply for all engines subject to the Tier 2 standards described in paragraph (b)(2) of this appendix.

[73 FR 37243, June 30, 2008, as amended at 75 FR 23012, Apr. 30, 2010]

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