The Tier 2 compliant 12.5 L PowerTech engine.
Engines meet tough emission standards
01 SEPTEMBER 2001
John Deere Power Systems says its new range of engines, designed to meet tougher emission regulations, highlights its commitment to the environment while ensuring their high performance and reliability.
The new line, which was showcased at the bauma trade fair in Munich, Germany, earlier this year, is designed to comply with the US Environment Protection Agency's Tier 2 emission regulations which became effective for all engines over 225 kW (325 hp) in January this year, according to a company spokesman.
"The regulations cover all John Deere PowerTech 12.5 L engines and the new 242 kW (325 hp) 8.1 L engine," he says. "These engines must also meet the European Union (EU) Stage II regulations which take effect on January 1 next year. EPA Tier 2 and EU Stage II standards for lower power engines will be phased in through January 1, 2004. This includes the John Deere 2.9 L, 4.5 L, 6.8 L engines, and the remainder of the 8.1 L models. John Deere's entire off-highway diesel engine line covers 37 to 373 kW (50 to 500 hp)."
He continues: "Initially introduced to the OEM market in 1996, the PowerTech 12.5 L engines were developed with Tier 2 requirements in mind, which resulted in very few changes in order to meet the non-road emission regulations.
"The only visible external change to the current 12.5 L Tier 1 engine is a new centre intake manifold. New EUIs (electronic unit injectors) allow for higher injection pressures to help meet emission regulations, while a new turbocharger improves air flow and performance.
"Fuel economy and heat rejection are impressively similar to the 12.5 L Tier 1 engines. The 12.5 L Tier 2 engine ratings cover the 224 to 373 kW (300 to 500 hp) range in increments of 19 kW (25 hp)."
The new 8.1 L engine with 242 kW (325 hp) rating is another exciting addition to the John Deere PowerTech line-up, says the spokesman.
"The company also began production of this new Tier 2 engine in January this year with modifications made to meet emission standards while retaining the same mounting points and engine envelope size.
"To maintain ease of installation, all options currently available on the 8.1 L engines are also available on Tier 2 models. Other enhancements include a new high-pressure common rail fuel system, air-to-air cooling, and improved full authority electronic engine controls.
"The new fuel system and electronics allow for higher injection pressures, better timing control and more precise control of fuel injection. In addition to complying with emission standards, the 8.1 L engine provides more power, higher torque, and optimum performance in a range of operating conditions.
"The remaining Tier 2 versions of the 8.1 L line cover the 149-224 kW (200-300 hp) power range and will be available from January next year to comply with European Union (EU) Stage II regulations.
"The EPA emission regulations for this power range will be effective one year later on January 1, 2003. The 149-224 kW (200-300 hp) 8.1 L engines will have similar configurations to the 242 kW (325 hp) 8.1 L model introduced earlier."
John Deere has also launched Tier 2 versions of the 4.5 l and 6.8 L engines using either a Stanadyne DE10 or a Bosch VP44 electronic rotary injection pump.
"The appropriate pump is matched to the engine based on its power rating and application. Both engines utilise John Deere Electronic Controls," says the spokesman.
"The 6.8 L engine features an electric fuel transfer pump and a remote-mounted electronic control unit. The 6.8 L Tier 2 engines will be turbocharged or air-to-air cooled."
The air-to-air cooled models include 138 kW (185 hp), 149 kW (200 hp) and 168 kW (225 hp) ratings. The 116 kW (155 hp) and the 127 kW (170 hp) turbocharged models are expected to begin production in January 2002, a year prior to emission regulations for that power level.
In addition, a new, higher power level, 186 kW (250 hp) 6.8 L will be available in January 2002.
The 4.5 L engines employ a mechanical fuel transfer pump and an engine- or remote-mounted electronic control unit.
The turbocharged 86 kW (115 hp) and the air-to-air cooled 104 kW (140 hp) versions are expected to be in production January 2002, one year prior to the Tier 2 emission deadline for that power level.
Tier 2 4.5 L models below 75 kW (100 hp) are expected to be available one year prior to the January 1, 2004 emission regulations deadline.
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