Johnson Matthey Incorporated (JMI) has submitted to the US EPA a notification of intent to certify urban bus retrofit/rebuild equipment pursuant to 40 CFR Part 85, Subpart O. The equipment, referred to by JMI as the Catalytic Reduction Technology-Cam (CRT-C) kit, consists of proprietary cam shafts, a CEM IITM catalytic exhaust muffler, and instructions that the engine must be rebuilt using specific engine rebuild parts and certain engine settings. The candidate kit is applicable to all 6V92TA, 6V71T, and 6V71TA urban bus engine models made by Detroit Diesel Corporation (DDC) from model years 1979 to 1989 and equipped with mechanical unit injectors (MUI).

JMI intends this equipment to be certified to the particulate matter standard of 0.10 grams per brake-horsepower-hour (g/bhp-hr) for less than the applicable life cycle cost limit. If the Agency certifies that this (or other) equipment complies with the 0.10 g/bhp-hr standard and is available for less than the applicable cost limit, then operators with affected engines will be required to use equipment certified to the 0.10 g/bhp-hr standard.

Source: US EPA