John Deere 6068 4-Valve Diesel Engine – Level 25 ECU Repair Manual (CTM139019)

Table of Content
Section 01—General Information
Group 000—Safety
Group 001—Engine Identification
Group 002—Fuels, Lubricants, and Coolant
Section 02—Repair and Adjustments
Group 010—Engine Rebuild
Group 020—Cylinder Head and Valve Repair and Adjustment
Group 030—Cylinder Block, Liners, Pistons, and Rods Repair and Adjustment
Group 040—Crankshaft, Main Bearings, Flywheel Repair, and Adjustment
Group 050—Camshaft and Timing Gear Train Repair and Adjustment
Group 060—Lubrication System Repair and Adjustment
Group 070—Cooling System Repair and Adjustment
Group 080—Air Intake and Exhaust System Repair and Adjustment
Group 090—Electronic Fuel System Repair and Adjustment
Group 100—OEM Starting and Charging Systems Repair and Adjustment
Group 110—Electrical Engine Control Repair and Adjustment
Group 112—Connector Repair and Adjustment
Section 03—Theory of Operation
Group 120—PowerTech Plus Base Engine Operation
Group 123—Cooling System
Group 126—Lubrication System
Group 130—Electronic Fuel System
Group 135—Air Intake and Exhaust System
Group 140—Electrical Control System
Section 04—Diagnostics
Group 150—Observable Diagnostics
Group 155—Checks, Tests, and Procedures
Group 160—Diagnostic Instructions and Information
Group 161—DTC SPN – 000001—000199
Group 162—DTC SPN – 000200—000699
Group 163—DTC SPN – 000700—001999
Group 164—DTC SPN – 002000—002299
Group 165—DTC SPN – 002300—002999
Group 166—DTC SPN – 003000—003999
Group 167—DTC SPN – 004000—529999
Section 05—Tools and Other Materials
Group 170—Special Tools
Group 180—Lubricants, Sealants, and Other Materials
Section 06—Specifications
Group 200—General Engine Specifications
Group 210—Diagnostic Specifications
This manual covers the base engine for PowerTech 6.8L engines including PowerTech “Plus” engine models. Information in this manual is organized in sections and sub divided into groups.
Section 01 covers the safety measures to follow while repairing the engine; engine identification features, engine emission and application details, and information about the fuels, lubricants, and coolants.
Section 02 covers the repair and adjustment procedures.
Section 03 explains the theory of operation of each system.
Section 04 is the diagnostics section that provides troubleshooting procedures to find problems.
Section 05 covers other materials needed to do the job.
Section 06 summarizes all specifications, wear tolerances, and torque values.
Most hardware on these engines is metric sized. Component Technical Manuals are concise service guides for specific components. Component Technical Manuals are written as stand-alone manuals covering multiple machine applications.