John Deere 6.8 Litre Diesel Engines
Features & Benefits
Specification Sheets
Performance Data
Genset Ratings
Engine Dimensions

Related Pages
Specification Sheets
from Deere's website
Frontier & John Deere
Deere standard warranty
Deere extended warranty

Features & Benefits - EPA Tier 2

Dynamically balanced crankshaft

• Crankshafts are machined from a heat-treated, high carbon steel forging

Forged-steel connecting rods

• Unique 45-degree design permits the use of a larger crankshaft connecting-rod bearings for increased durability

Self-adjusting Poly-vee Fan Drive

• Self adjusting, eight-groove, poly-vee fan drive provides multiple fan drive ratios and fan heights that can be matched to specific application requirements
• Poly-vee design provides more than twice the drive capacity of comparable vee-belts

Replaceable Wet-Type Cylinder Liners

• Provides excellent heat dissipation
• Precision machined for long life

Either-Side Service

• Entire installation and maintenance simplified and convenient by providing dipstick and oil filter options on both sides of of the engine

500-Hour Oil Change

• Customers save significant costs on oil, filters and labor with a 500-hour oil change interval

Standard Gear Auxiliary Drive

• Standard gear auxiliary drive produces up to 50 hp (37 kW) for gear-driven accessories

Mounting Points

• Standard front and side mounting points provide easy installation and application flexibility

Electronic-Controlled Rotary Injection Pump

• Electronic-Controlled rotary injection pump distributes the precise amount of fuel required by each cylinder at exactly the right time
• Electronic controls monitor engine speed and load to determine fuel timing

SAE J1939 Standard Communication Link

• Industry standard, which provides an interface with vehicle systems, like the transmission, hydraulics and various accessory drives minimizing machine complexity and reducing the installed cost

EPA Tier 3 - PowerTech Plus

Variable Geometry Turbocharger (VGT)

• 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.

Cooled Exhaust Gas Recirculation (EGR)

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

4-Valve Cylinder Head

• Provides excellent airflow resulting in greater low speed torque and better transient response. Cross flow design.

Air-to-Air Intercooling

• Most efficient method of cooling intake air to help reduce engine emissions while maintaining low speed torque, transient response time and peak torque. Enables an engine to meet emissions with better fuel economy and the lowest installed costs

High Pressure Electronic Fuel Injection Systems

• HPCR: Higher injection pressures, up to 1600 bar (23,500 PSI), variable injection pressure, variable timing control, multiple injections and controls the duration of injection.

High-Pressure Common Rail Fuel System

• With the HPCR, the fuel pump sends constant pressure into a common rail, supplying each injector with constant pressurized fuel that's available when the electronic injector opens

Compact Size

• Horsepower/displacement ratio is best-in-class (lower installed cost)
• Mounting points for Tier 3/Stage III A engine models same as Tier 2/Stage 2 engine models

John Deere Electronic Engine Controls

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

Engine Performance

• New 'power bulge' feature
• Multiple rated speeds to further reduce noise and improve fuel economy
• New higher peak torque ratings
• Better transient response time
• Greater levels of low speed torque

Additional Features

• Glow plugs; gear-driven auxiliary drive; optional 500-hour oil change; self adjusting ploy-vee fan drive, R.H. and L.H. engine mounted fuel filters; engine mounted ECU

EPA Tier 3 - PowerTech E

High-Pressure Common Rail Fuel System

• Higher injection pressures, up to 1600 (23,500 PSI), variable injection pressure, variable timing control, multiple injections

2-Valve Cylinder Head

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

Fixed Geometry or Wastegated Turbocharger

• Dependent on power rating, fixed geometry or wastegated turbochargers precisely matched to the power level and application

Air-to-Air Intercooling

• Most efficient method of cooling intake air to help reduce engine emissions while maintaining low speed torque, transient response time, and peak torque. Enables an engine to meet emissions with better fuel economy and the lowest installed costs.

Compact Size

• Mounting points for Tier 3/ Stage III A engines are the same as Tier 2/Stage II engines

Multiple Injection Strategy

• The new high-pressure common rail (HPCR) fuel system and engine control unit (ECU) allow for multiple fuel injections. The number of fuel injections, based on speed and load, help contribute to lower combustion temperatures, which reduce the formation of NOx and particulates. The multiple injection strategy also provides an added benefit of noise reduction.

Engine Performance

• New 'power bulge' feature
• Increased low speed torque
• Multiple rated speeds to further reduce noise and improve fuel economy
• New higher peak torque ratings
• Faster torque rise

John Deere Electronic Engine Controls

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

Additional Features

• Self-adjusting poly-vee fan drive
• Forged-steel connecting rods
• Replaceable wet-type cylinder liners
• Either-side service
• 500-hour oil change
• Standard gear auxiliary drive

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