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The California Air Resources Board (ARB) has posted an advisory
on the sale and purchase of diesel engines used in agriculture. 
The advisory (located at
http://www.arb.ca.gov/diesel/ag/inuseag.htm ) is especially
directed at noncertified or "Tier 0" diesel engines manufactured
prior to 1996.
 
California regulates the sale, purchase, rental/lease, and
operation of diesel engines, including diesel engines used in
agriculture.  ARB has recently become aware that used Tier 0
diesel agricultural irrigation pump and gen set engines
advertised on EBay, Craig's List, and similar websites do not
meet Stationary Diesel Engine airborne toxic control measure
(ATCM) emission standards for the installation and use of
agricultural engines.  ARB has notified these websites about the
ATCM and requested that they publish disclaimers with ads for
Tier 0 engines.

ARB and the local air districts are in the process of educating
thousands of California growers about agricultural engine
amendments to the ATCM, which became effective on October 18,
2007.  We are concerned that growers could unknowingly purchase
engines that they will not be able to install and use.  
Therefore, we encourage all stakeholders to help us spread the
word that local air quality districts should be consulted prior
to selling or purchasing diesel agricultural pump or gen set
engines, particularly used engines.  The appropriate local air
district can be determined using grower county or zip code
information at http://www.arb.ca.gov/app/dislookup/dislookup.php
.  

Alternatively, air district contact information (including
specific agricultural engine program contact persons, if
available) may be obtained by contacting Barbara Cook at 
(916) 323-0440 or bcook@arb.ca.gov, or, Jon Manji at 
(916) 327-1507 or jmanji@arb.ca.gov.