John Deere 6.8 Litre Diesel Engines
Industrial engine specifications
Generator set engine specifications

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Specification Sheets - deere.com
Frontier & John Deere
Deere standard warranty
Deere extended warranty

Interim Tier 4 PowerTech™ PVX 6068 Industrial Engine
PowerTech PVX 6.8L engines feature a variable geometry turbocharger (VGT) that varies exhaust pressure based on load and speed to ensure proper cooled exhaust gas recirculation (EGR) flow. EGR cools and mixes measured amounts of cooled exhaust gas with incoming fresh air to lower peak combustion temperatures, thereby reducing NOx. The combination of the cooled EGR and VGT provide low-speed torque, quicker transient response, higher-peak torque, and world-class fuel economy. These engines also utilize a catalyzed exhaust filter that contains a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). The DOC reacts with exhaust gases to reduce carbon monoxide, hydrocarbons, and some particulate matter (PM). The downstream DPF traps and holds the remaining PM.

Interim Tier 4 PowerTech™ PSX 6068 Industrial Engine
PowerTech PSX 6.8L engines feature series turbochargers that deliver more boost pressure than single turbocharging configurations which results in higher power density, improved low-speed torque, and improved high altitude operation. These high-performing engines use cooled exhaust gas recirculation (EGR). This technology cools and mixes measured amounts of cooled exhaust gas with incoming fresh air to lower peak combustion temperatures, thereby reducing NOx. These engines also utilize a catalyzed exhaust filter that contains a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). The DOC reacts with exhaust gases to reduce carbon monoxide, hydrocarbons, and some particulate matter (PM). The downstream DPF traps and holds the remaining PM.

Tier 3 PowerTech™ Plus 6068 Industrial Engine
This 6.8L, 6-cylinder engine, meets emissions requirements without sacrificing performance. New features include cooled exhaust gas recirculation, variable geometry turbocharger, power bulge, 4-valve cylinder heads, and a high-pressure common rail fuel system. Power ratings, fuel economy, torque levels, transient response time, and other features meet or exceed Tier 2/Stage II.

Tier 3 PowerTech™ E 6068 Industrial Engine
This 6.8L, 6-cylinder engine, meets emissions requirements without sacrificing performance. New features include cooled exhaust gas recirculation, variable geometry turbocharger, power bulge, 4-valve cylinder heads, and a high-pressure common rail fuel system. Power ratings, fuel economy, torque levels, transient response time, and other features meet or exceed Tier 2/Stage II.

Tier 2 PowerTech™ 6068 Industrial Diesel Engine
Precision and flexibility come together in this 6-cylinder 6.8L diesel engine. Self-adjusting poly-vee fan drive provides more than twice the capacity of comparable vee-belts. Either-side service option makes dipstick and oil filter available where you need them.

• Multiple rated speeds to further reduce noise and improve fuel economy
• Higher level of peak torque
• Optional power bulge (PVX & PSX-Interim Tier 4)
• Better transient response time (Plus-Tier 3)
• Higher power bulge (Plus-Tier 3)

• EGR cools and mixes measured amounts of cooled exhaust gas with incoming fresh air to lower peak combustion temperatures, thereby reducing NOx.

• Fresh air is first drawn into the low-pressure turbocharger (fixed geometry) and compressed to a higher pressure. The compressed air is then drawn into the high-pressure turbocharger where the air is further compressed. The high-pressure air is then routed through a charge air cooler and into the engine's intake manifold.
• By splitting the work between two turbochargers, both can operate at peak efficiency and at slower rotating speeds - lowering stress on turbocharger components and improving reliability. Series turbocharging delivers more boost pressure than single turbocharger configurations which results in higher power density, improved low-speed torque, and improved high altitude operation.

• Varies exhaust pressure based on load and speed to insure proper EGR flow; greater low-speed torque, quicker transient response, higher peak torque, and best-in-class fuel economy.

• Fixed geometry turbochargers are sized for a specific power range and optimized to provide excellent performance across the entire torque curve. They are also designed to maximize fuel economy between the engine's rated speed and peak torque.

• The HPCR fuel system provides variable common-rail pressure and higher injection pressures up to 1,975 bar (29,000 psi).One ECU controls the exhaust filter, as well as fuel system and provides precise control for the start, duration, and end of injection.

• The EUI fuel system provides higher injection pressures up to 2,275 bar (33,000 psi) for Tier 4 engines, and up to 2000 bar (29,000 psi) for Tier 3. One ECU controls the exhaust filter, as well as fuel system and provides precise control for the start, duration, and end of injection.

• The 4-valve cylinder head provides excellent airfow resulting in greater low-speed torque and better transient response time by utilizing a cross-flow design (PVX and Plus) or U-flow design (PSX).

• Cross flow head design that provides excellent breathing from a lower cost two-valve cylinder head

• This is the most efficient method of cooling intake air to help reduce engine emissions while maintaining low-speed torque, transient response time, and peak torque. It enables an engine to meet emissions regulations with better fuel economy and the lowest installed costs.

• These engines utilize a catalyzed exhaust filter that contains a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). The DOC reacts with exhaust gases to reduce carbon monoxide, hydrocarbons, and some particulate matter (PM). The downstream DPF traps and holds the remaining PM. Trapped particles are oxidized within the DPF through a continuous cleaning process called passive regeneration.
• Passive regeneration occurs during normal operating conditions when heat from the exhaust stream and catalysts within the exhaust filter trigger the oxidation of the trapped PM. If passive regeneration cannot be achieved due to low temperature, load, or speed, then PM is removed using active regeneration - an automatic cleaning process controlled by the exhaust temperature management system.

• Electronic engine controls monitor critical engine functions, providing warning and/or shutdown to prevent costly engine repairs and eliminate the need for add-on governing components all lowering total installed costs. Snapshot diagnostic data that can be retrieved using commonly available diagnostic service tools
• Controls utilize new common wiring interface connector for vehicles or available OEM instrumentation packages; new solid conduit and "T" connectors to reduce wiring stress and provide greater durability and improved appearance
• Factory-installed, engine mounted ECU or remote-mounted ECU comes with wiring harness and associated components. Industry-standard SAE J1939 interface communicates with other vehicle systems, eliminating redundant sensors and reducing vehicle installed cost

• Lower installed cost
• Mounting points are the same as previous engine models

• JDLinkTM lets you monitor, protect, and maintain your equipment 24/7
• Premium software option integrates with equipment or vehicles to reduce engineering and installation costs
• 500-hour oil change
• Optional factory installed variable-speed fan drive improves fuel economy and reduces noise levels
• R.H. and L.H. engine-mounted final fuel filters
• Low-pressure fuel system with electrical transfer pump and "auto-prime" feature

• Glow plugs (Plus)
• Gear-driven auxiliary drives
• 500-hour oil change
• self-adjusting poly-vee fan drive
• R.H. and L.H. engine-mounted fuel filters
• Replaceable wet-type cylinder liners (PowerTech E)