New Off-Road Compression-Ignition (Diesel) Engines and Equipment

>This page last reviewed Novenmber 30, 2012

This category consists of new compression-ignition engines (a.k.a. diesel engines) that are found in a wide variety of off-road applications such as farming, construction, and industrial. Some familiar examples include tractors, excavators, dozers, scrapers, portable generators, transport refrigeration units (TRUs), irrigation pumps, welders, compressors, scrubbers, and sweepers. This category, however, does not include locomotives, commercial marine vessels, marine engines over 37 kilowatts (kW), or recreational vehicles.

Requirements for off-road compression-ignition engine certification include provisions from demonstrating compliance with the applicable emission standards using specific test procedures, as well as emission labeling and warranty obligations. For more details on the certification process, please go to the off-road compression-ignition webpage.

Please view additional information regarding ARB's program to reduce particulate matter (PM) emissions from existing off-road diesel equipment.
What's New  
Posted November 27, 2012:
The final Off-Road CI Engine amendments, which were adopted by the Air Resources Board on December 16, 2011, were filed with the California Office of Administrative Law (OAL) on October 26, 2012. OAL has until December 12, 2012, to render a decision.
On March 22, 2012, a Notice of Public Availability of Modified Text was posted and made available for a fifteen-day public comment period.
On November 15, 2011, a Notice of Change in the Public Hearing Date was posted, which rescheduled the date of the hearing from December 15, 2011, to December 16, 2011.
On November 4, 2011, an Errata was posted to provide minor corrections to the staff report that had been posted October 26, 2011.
The applicable regulatory documents for the above indicated actions can be found at the following link: Board Hearing Regulatory Materials
Posted October 28, 2011:
On December 15, 2011, the Air Resources Board will consider proposed amendments to the California regulations and test procedures for SORE/LSI/OHRV/Off-Road CI/Rec Marine.  Specifically, the discussion will focus on test procedures for SORE and Tier 4 Off-Road CI, and the exhaust emission test fuel for off-road SI engines, equipment, and vehicles.  The meeting notice, staff report, and all other regulatory documents can be found at the following link:  Board Hearing Regulatory Materials
Posted April 20, 2005:
  Draft 15-day modifications to the off-road diesel Tier 4 regulations are now available. 
Posted January 19, 2005:
On December 9, 2004, the Board adopted a fourth phase of emission standards (Tier 4) that are nearly identical to those finalized by the U.S. EPA on May 11, 2004, in its Clean Air Nonroad Diesel Rule. As such, engine manufacturers are now required to meet aftertreatment-based exhaust standards for particulate matter (PM) and NOx starting in 2011 that are over 90 percent lower than current levels, putting off-road engines on a virtual emissions par with on-road heavy-duty diesel engines.
Posted November 14, 2004:
ARB is starting work on a rule to reduce particulate matter (PM) emissions from existing off-road diesel equipment in California. 
Posted October 20, 2004:
The Staff Report and proposed Regulations and Test Procedures for the Tier 4 Off-Road Diesel Engine Rulemaking will be available after 5p.m. PST, Friday, October 22, 2004. 
Posted October 1, 2004:
The Draft Proposed Regulations for the upcoming Tier 4 Off-Road Diesel Engine Rulemaking are now available. The submittal of comments regarding this draft is not necessary. ARB intends to release the official proposal for a 45-day public comment period on October 22, 2004.