John Deere 3029, 4039, 4045, 6059, 6068 Diesel Engines Workshop Manual (P/N T04039DN003)

• Covers John Deere Series 300 3029, 4039, 4045, 6059, and 6068 diesel engines in 3-, 4-, and 6-cylinder configurations, including naturally aspirated, turbocharged, air-to-air aftercooled, and air-to-coolant aftercooled builds.
• Walks through internal engine disassembly and reassembly, cylinder-head and valve-train repair, wet-liner and piston service, connecting-rod inspection, crankshaft and main-bearing work, and flywheel and rear-seal installation.
• Distinguishes auxiliary-drive timing arrangements, 4-cylinder balancer-shaft engines, aluminum and composite timing covers, front PTO configurations, and early/later component designs identified in the factory procedures.
• Separates lubrication-system builds such as standard- and high-flow oil coolers, standard- and high-capacity oil pumps, and pre-common-lube versus common-lube 4045/6068 cylinder blocks.
• Details thermostat and water-manifold service; low-flow, standard-duty high-flow, modular, and heavy-duty high-flow water-pump repair; turbocharger inspection; center-housing/rotating-assembly replacement; and aftercooler service.
• Addresses Stanadyne DB2, DB4, and DM4 and Lucas CAV fuel systems, including pump removal and installation, timing, aneroid service, injector-nozzle testing and repair, bleeding, supply-pressure checks, and speed/governor adjustment.
• Includes malfunction charts and factory tests for compression, oil pressure, crankcase blow-by, cooling-system pressure, intake restriction, boost, fuel delivery, dynamic pump timing, dynamometer testing, and post-rebuild break-in.

Engine Identification and Application Coverage

This 505-page PDF is John Deere Component Technical Manual CTM8, dated 23FEB95. It supersedes the CTM8 edition dated 4NOV92. The front matter identifies coverage for all 2.9 L engines produced at Saran, France, along with 3.9 L, 4.5 L, 5.9 L, and 6.8 L engines produced at Dubuque and Saran.

The model-designation pages explain how to read the producing-factory code, cylinder count, displacement, aspiration code, user code, and application code before selecting a repair section or ordering parts. Application charts then cross-reference engine codes to agricultural and industrial equipment, including tractors, combines, cotton equipment, self-propelled sprayers, windrowers, loaders, crawlers, excavators, motor graders, forestry machines, forklifts, and OEM installations.

Factory Repair Depth and Build Differences

The rebuild guide begins with engine-stand mounting, lifting, cleaning, and the framework for full teardown and assembly. Component chapters go well beyond routine maintenance. They cover valve guides and seats, cylinder-head inspection, wet-liner installation, piston cooling orifices, connecting-rod bushings and bearings, crankshaft and thrust-bearing service, flywheel runout, camshaft and follower inspection, timing-gear setup, and balancer-shaft repair.

Build-specific instructions address crankshaft- and camshaft-driven auxiliary arrangements, early and later front-plate/camshaft-bushing designs, one-piece and bolt-on balancer-shaft configurations, front PTO equipment, two-piece and unitized rear oil seals, and the different service approach used on pre-common-lube and common-lube blocks. The related reference data includes component torque and torque-turn charts, valve-train specifications, liner stand-out and wear limits, piston and bearing clearances, crankshaft inspection and grinding limits, gear backlash and end-play data, lubrication specifications, and factory sealant and thread-lock application charts.

Tool callouts identify the required service equipment at the applicable procedures. Examples include the JDG739 camshaft-bushing service set, JD254 gear-timing tool, JDE81-4 timing pin, KJD10164 front crankshaft-seal installer, and JT07158 TIME TRAC kit. Group 199 also provides fabrication drawings for the DFRG2 injection-pump timing-mark transfer tool and DFRG3 cylinder-liner holding fixture.

Fuel, Air, and Diagnostic Coverage

Fuel-system material covers filter and supply-pump checks, injection-pump removal and installation, static and dynamic timing, aneroid service, engine-speed and governor adjustments, fuel-system bleeding, and running tests. Injector nozzles receive separate diagnosis, testing, cleaning, adjustment, and resealing procedures. Internal injection-pump testing and overhaul are outside the shop-level scope of CTM8; the manual directs that work to an authorized diesel-injection repair station.

The operation-and-tests groups support troubleshooting before major parts are removed. Representative visual references include the Engine—Sectional View, lubrication- and cooling-system flow diagrams, auxiliary-drive operation views, head-gasket joint and failure-analysis illustrations, a turbocharger operation cutaway, and Stanadyne and Lucas CAV pump-operation diagrams.

Scope and Shop Cautions

CTM8 is the internal engine component manual. Machine-specific access and engine removal or installation are handled in the technical manual for the tractor, sprayer, loader, or other machine using the engine.

Two cautions show why the factory sequence matters. On a turbocharged engine mounted to a rollover stand, oil can migrate through a connected turbo oil line and into the intake, exhaust, or cylinders, creating a hydraulic-lock risk at restart. The manual also treats piston cooling orifices as critical components; a damaged, blocked, or missing orifice can harm the piston, pin, bushing, and liner and can affect engine oil pressure. Engine repair involves heavy lifting, pressurized fuel, and rotating test equipment, so the safety sections and the applicable machine manual should be followed before work begins.