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John Deere 4039T Specifications
| Engine Model: John Deere 4039T |
| Engine Type: 4-cycle inline 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 239 cu.in (3.9 L) |
| Rated Engine Power: 75-100 Hp (55-74 kW) at 2500 rpm |
| Aspiration Type: Turbocharged |
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| General Technical Data |
The John Deere 4039T is a turbocharged,
four-cylinder diesel engine designed for industrial and construction
equipment applications where increased power density is required. This
engine builds upon the foundational architecture of the 4039 series by
adding turbocharging to the naturally aspirated core. The integration of
a turbocharger elevates torque output and power, making it suitable for
heavier-duty tasks within excavators and larger power units.
It retains the mechanical fuel system and robust cast-iron construction
known for durability and serviceability in demanding environments. The
4039T is engineered for applications requiring reliable power under
continuous high load.
Engine Model: John Deere 4039T.
Engine Type: Four-stroke, direct injection, turbocharged diesel engine.
Number of Cylinders: 4, in-line.
Bore: 106.5 mm (4.19 inches).
Stroke: 110.0 mm (4.33 inches).
Displacement: 3.9 liters (239 cubic inches).
Compression Ratio: Data not standardized across all applications.
Aspiration: Turbocharged.
Rated Power: Output varies by application; common range is 75-100 Hp
(55-74 kW).
Peak Torque: Output is elevated compared to the naturally aspirated
4039D, specific values vary by application. Firing Order: 1-3-4-2.
Rotation (flywheel end): Counterclockwise.
Governor Type: Mechanical, minimum-maximum all-speed type.
Emissions Compliance: Designed to meet Tier 3/Stage IIIA industrial
emissions standards.
| Cylinder Block |
The cylinder block is a one-piece cast iron construction. It employs a deep-skirt design that provides a rigid foundation for the rotating assembly and dampens vibration. Cylinder liners are replaceable, dry-type units manufactured from centrifugally cast iron. The block incorporates five main bearing caps, also constructed from cast iron.
Main bearing caps are secured with two vertical bolts per cap. Internal oil galleries and coolant passages are cast into the block structure. The block is designed to accommodate the increased cylinder pressures resulting from turbocharging.
| Cylinder Head and Valves |
The cylinder head is a single-piece cast iron component. It is secured to the block with a multi-bolt pattern that requires a specific tightening sequence. The head uses a direct injection configuration with fuel injectors positioned vertically. It houses two valves per cylinder: one intake and one exhaust.
Valve seats are induction hardened to withstand elevated combustion temperatures. Valve guides are replaceable. Valve actuation is via pushrods and rocker arms from a single camshaft located within the cylinder block. The camshaft is gear-driven from the crankshaft.
| Fuel System |
The fuel system is a direct injection, mechanically governed system. A rotary-type injection pump, driven by the engine timing gears, delivers high-pressure fuel to individual injector lines. Unit injectors, one per cylinder, atomize fuel directly into the combustion chamber.
The system’s mechanical governor regulates fuel delivery to maintain a set engine speed under varying load. The fuel supply circuit includes a primary sediment filter with a water separator and a secondary spin-on fuel filter. A mechanical lift pump supplies fuel from the tank to the injection pump.
| Lubrication System |
The lubrication system is a forced-feed, full-flow filtration design. A gear-type oil pump, driven from the front gear train, draws oil from the sump through a pickup tube and screen. Oil is pumped through a full-flow, replaceable spin-on oil filter. An oil cooler is integrated into the system to manage the increased thermal load from turbocharging.
Pressurized oil is delivered to the crankshaft main and connecting rod bearings, the camshaft bearings, the rocker arm shaft, and the turbocharger center bearing. Engine oil capacity is 8.5 liters (2.25 U.S. gallons). Oil must meet John Deere Plus-50 II or equivalent API CJ-4, ACEA E7 specifications.
| Cooling System |
The engine uses a pressurized, forced-circulation liquid cooling system. A centrifugal water pump, belt-driven from the crankshaft, circulates coolant. Coolant flows through the cylinder block, cylinder head, and the oil cooler. System temperature is regulated by a thermostatic valve.
The system is designed for use with a radiator and fan. Coolant must be a 50/50 mixture of clean water and ethylene glycol antifreeze with a supplemental coolant additive (SCA). Total coolant capacity is 12 liters (3.2 U.S. gallons).
| Other Systems |
Starting System: A 12-volt electrical system with a solenoid-actuated
starter motor.
Charging System: A 12-volt alternator with an integrated voltage
regulator; amperage is application-specific. Air Intake System: Includes
a dry-type air filter and ducting to the turbocharger.
Exhaust System: Equipped with a turbocharger; exhaust gases drive the
turbine before exiting via a vertical stack. Engine Braking: Not
equipped as standard.
| Dimensions and Weight |
Overall Length: 845 mm (33.2 inches).
Overall Width: 535 mm (21.1 inches).
Overall Height: 995 mm (39.1 inches).
Dry Weight: 440 kg (935 lbs).
| Maintenance Data |
Engine Oil Change Interval: 250 hours or annually for severe service.
Oil Filter Change: Every oil change interval.
Fuel Filter Primary (water separator): Drain water daily. Replace
element every 250 hours.
Fuel Filter Secondary: Replace every 500 hours.
Coolant: Test SCA concentration every 250 hours; replace coolant every
3000 hours or 3 years.
Air Filter Element: Service or replace based on restriction indicator;
operating in dusty conditions requires more frequent service.
Valve Clearance Adjustment (cold engine): Intake valve: 0.36 mm (0.014
inches). Exhaust valve: 0.46 mm (0.018 inches). Check every 1000 hours.
Belt Tension: Check and adjust fan/alternator belt tension every 250
hours.
| Tightening Torques |
Cylinder Head Bolts: Multi-stage sequence required. Initial stage: 102
Nm. (75 lb-ft). Second stage: 149 Nm. (110 lb-ft). Final stage: Tighten
an additional 50 to 70 deg angular rotation.
Main Bearing Cap Bolts: 115 Nm. (85 lb-ft).
Connecting Rod Cap Bolts: Initial torque 54 Nm. (40 lb-ft), then tighten
an additional 90 to 100 deg angular rotation. Rocker Arm Shaft Bracket
Bolts: 61 Nm. (45 lb-ft).
Oil Pan Bolts: 27 Nm. (20 lb-ft).
Turbocharger Mounting Nuts/Bolts: 41 Nm. (30 lb-ft).
| Machinery Applications |
The John Deere 4039T is engineered for industrial and construction equipment requiring greater power than the naturally aspirated 4039D can provide. A primary application is as the powerplant for mid-size excavators, such as various models within the John Deere E-Series and G-Series excavator lines. The engine is also used in heavier-duty generator sets and industrial power units where turbocharging delivers necessary peak power and torque.
Additional applications include driving high-capacity hydraulic systems in forestry equipment, rock crushers, and industrial pumps. Its use is common in equipment where the operational environment demands the ruggedness of a mechanical engine with the enhanced performance of turbocharging.
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