A certificate of conformity is no longer valid for an engine if the engine is modified
such that it is not in a configuration covered by the certificate. This section applies if such modifications are done to convert the engine to run
on a different fuel type. Such engines may need to be recertified as specified in this section if the certificate
is no longer valid for that engine.
(a) Converting a certified new engine to run on a different fuel type violates 40 CFR 1068.101(a)(1) if the modified engine is not covered by a certificate of conformity.
(b) Converting a certified engine that is not new to run on a different fuel type violates
40 CFR 1068.101(b)(1) if the modified engine is not covered by a certificate of conformity. We may specify alternate certification provisions consistent with the requirements
of this part. For example, you may certify the modified engine for a partial useful life. For example, if the engine is modified halfway through its original useful life
period, you may generally certify the engine based on completing the original useful
life period; or if the engine is modified after the original useful life period is
past, you may generally certify the engine based on testing that does not involve
further durability demonstration.
(c) Engines may be certified using the certification procedures for new engines as specified
in this part or using the certification procedures for aftermarket parts as specified
in 40 CFR part 85, subpart V. Unless the original engine manufacturer continues to be responsible for the engine
as specified in paragraph (d) of this section, you must remove the original engine
manufacturer's emission control information label if you recertify the engine.
(d) The original engine manufacturer is not responsible for operation of modified engines
in configurations resulting from modifications performed by others. In cases where the modification allows an engine to be operated in either its original
configuration or a modified configuration, the original engine manufacturer remains
responsible for operation of the modified engine in its original configuration.
(e) Entities producing conversion kits may obtain certificates of conformity for the
converted engines. Such entities are engine manufacturers for purposes of this part.
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