19 April 2001
A new line of industrial diesel engines certified to the EU Stage II and the US Tier 2 emission standards was unveiled by John Deere Power Systems during the BAUMA show in Munich, Germany earlier this month. The first Stage II/Tier 2 engines to debut were the largest displacement models: the PowerTech 12.5 L engine in ratings from 224 to 373 kW (300 - 500 hp), as well as one 242 kW (325 hp) 8.1 L engine.
Production of the PowerTech 12.5 L engines began in January 2001. Various models of the 8.1 L engine, as well as 6.8, 4.5, and 2.9 L models of the Stage II/Tier 2 engines will be phased in from 2001 through 2004. The EU Stage II regulations become effective between 2001 and 2004, depending on engine category (January, 2002 for the 12.5 L engine). The US Tier 2 regulations for nonroad diesel engines come in power between 2001 and 2006 (January, 2001 for the 12.5 L engine). These European and US regulations show a certain degree of harmonization.
Deere said the new engines achieved the lower emission levels through the use of advanced electronics to provide a precise control of engine power and torque, and to deliver faster cold starting and lower smoke levels. Other changes include new pistons, electronic unit injectors (EUI), and new turbochargers. All Tier 2 8.1 L engines will also feature a high pressure common rail (HPCR) fuel system (Nippondenso). The ECU-governed fuel system features full-authority electronics that determines fuel pressure, when injector opens, how long it stays open, and when it closes.
Source: John Deere