(a) The provisions of this part apply to everyone with respect to the following engines and to equipment using the following engines (including owners, operators, parts manufacturers, and persons performing maintenance):
(1) Locomotives we regulate under 40 CFR part 1033.
(2) Heavy-duty motor vehicles and motor vehicle engines to the extent and in the manner specified in 40 CFR parts 85, 86, 1036 and 1037.
(3) Land-based nonroad compression-ignition engines we regulate under 40 CFR part 1039.
(4) Stationary compression-ignition engines certified using the provisions of 40 CFR part 1039, as indicated in 40 CFR part 60, subpart IIII.
(5) Marine compression-ignition engines we regulate under 40 CFR part 1042.
(6) Marine spark-ignition engines we regulate under 40 CFR part 1045.
(7) Large nonroad spark-ignition engines we regulate under 40 CFR part 1048.
(8) Stationary spark-ignition engines certified using the provisions of 40 CFR part 1048 or part 1054, as indicated in 40 CFR part 60, subpart JJJJ.
(9) Recreational engines and vehicles we regulate under 40 CFR part 1051 (such as snowmobiles and off-highway motorcycles).
(10) Small nonroad spark-ignition engines we regulate under 40 CFR part 1054.
(b) This part does not apply to any of the following engine or vehicle categories:
(1) Light-duty motor vehicles (see 40 CFR part 86).
(2) Highway motorcycles (see 40 CFR part 86).
(3) Heavy-duty motor vehicles and motor vehicle engines, except as specified in 40 CFR parts 85 and 86.
(4) Aircraft engines, except as specified in 40 CFR part 87.
(5) Land-based nonroad compression-ignition engines we regulate under 40 CFR part 89.
(6) Small nonroad spark-ignition engines we regulate under 40 CFR part 90.
(7) Marine spark-ignition engines we regulate under 40 CFR part 91.
(8) Locomotive engines we regulate under 40 CFR part 92.
(9) Marine compression-ignition engines we regulate under 40 CFR parts 89 or 94.
(c) Paragraph (a) of this section identifies the parts of the CFR that define emission standards and other requirements for particular types of engines and equipment. This part 1068 refers to each of these other parts generically as the ``standard-setting part.'' For example, 40 CFR part 1051 is always the standard-setting part for snowmobiles. Follow the provisions of the standard-setting part if they are different than any of the provisions in this part.
(d) Specific provisions in this part 1068 start to apply separate from the schedule for certifying engines to new emission standards, as follows:
(1) The provisions of Sec. Sec. 1068.30 and 1068.310 apply for stationary spark-ignition engines built on or after January 1, 2004, and for stationary compression-ignition engines built on or after January 1, 2006.
(2) The provisions of Sec. Sec. 1068.30 and 1068.235 apply for the types of engines/equipment listed in paragraph (a) of this section beginning January 1, 2004, if they are used solely for competition. [76 FR 57488, Sept. 15, 2011, as amended at 77 FR 36386, June 18, 2012; 78 FR 36399, June 17, 2013]