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EPA/AR

RIN: 2060-AN39

Publication ID: Fall 2008

Title: Optional Chassis Certification for Diesel Vehicles
Abstract: Prior to the heavy-duty 2007 rulemaking (HD 2007), we have required that crankcase emissions be controlled only on naturally aspirated diesel engines. We made an exception for turbocharged heavy-duty diesel engines in the past because of concerns regarding fouling that could occur from diesel PM and engine oil, which are included in the crankcase emissions, when routing the crankcase blow-by into the turbocharger and aftercooler. However, this was an environmentally significant exception since most heavy-duty diesel trucks use turbocharged engines, and a single engine can emit over 100 pounds of NOx, NMHC, and PM from the crankcase over its lifetime. Therefore, given the availability of technologies to control crankcase emissions and the significant environmental benefit for eliminating those emissions, we are proposing new requirements for crankcase emissions in the HD 2007 rulemaking. Those provisions require that heavy-duty diesel engines either close the crankcase or account for any crankcase emissions within the total compliance limits of the tailpipe emissions standard. This requirement had the unintended consequence of confusing which crankcase provisions should apply to these heavy-duty diesel engines, those of Subpart S or the newly defined diesel provisions of. It was our intention that these vehicles meet the newly defined requirements of closed crankcase provisions just as other heavy-duty diesel engines must. Therefore, we are finalizing a change to the HD 2007 that explicitly defines the crankcase provisions applicable for heavy-duty chassis certified diesel engines under 14,000 pounds as those provisions defined under CFR section 86.007-11. There are no environmental impacts. This represents a cost savings to the manufacturers of highway heavy duty diesel engines.
Agency: Environmental Protection Agency(EPA)	Priority: Substantive, Nonsignificant
RIN Status: Previously published in the Unified Agenda	Agenda Stage of Rulemaking: Completed Actions
Major: No	Unfunded Mandates: No
CFR Citation: 40 CFR 86.1863-07
Legal Authority: 42 USC 7414 42 USC 7601(a)

Legal Deadline: None

Timetable:

Action	Date	FR Cite
Withdrawn	08/29/2008

Additional Information: SAN No. 4993
Regulatory Flexibility Analysis Required: No	Government Levels Affected: None
Small Entities Affected: No	Federalism: No
Included in the Regulatory Plan: No
RIN Data Printed in the FR: No
Agency Contact: Zuimdie Guerra Environmental Protection Agency Air and Radiation AAHDOC, Washington, DC 20460 Phone:734 214-4387 Email: guerra.zuimdie@epamail.epa.gov Cleophas Jackson Environmental Protection Agency Air and Radiation 1200 Pennsylvania Avenue NW., Washington, DC 20460 Phone:734 214-4824 Email: jackson.cleophas@epamail.epa.gov