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John Deere 4039D Specifications
| Engine Model: John Deere 4039D |
| Engine Type: 4-cycle inline 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 239 cu.in (3.9 L) |
| Rated Engine Power: 50-80 Hp (37-60 kW) at 2500 rpm |
| Aspiration Type: Naturally aspirated |
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| General Technical Data |
The John Deere 4039D is a four-cylinder,
naturally aspirated diesel engine engineered for industrial power units
and construction equipment. This four-stroke, liquid-cooled engine
employs a direct injection, mechanically governed fuel system known for
its simplicity and durability under continuous load. Its cast-iron
construction provides robustness for demanding auxiliary applications.
The engine delivers a wide power band suitable for driving hydraulic
systems, generators, and compressors. The design emphasizes
serviceability and reliable operation in stationary and mobile
industrial environments.
Engine Model: John Deere 4039D.
Engine Type: Four-stroke, direct injection, naturally aspirated 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: Naturally aspirated.
Rated Power: Output varies by application and governing; common range is
50-80 Hp (37-60 kW).
Peak Torque: Output varies by application and governing.
Firing Order: 1-3-4-2.
Rotation (flywheel end): Counterclockwise.
Governor Type: Mechanical, minimum-maximum all-speed type.
Emissions Compliance: Designed to meet pre-Tier 4/Stage IIIB industrial
emissions standards.
| Cylinder Block |
The cylinder block is a one-piece cast iron construction. It uses a deep-skirt design that contributes to structural rigidity and reduced vibration. Cylinder liners are replaceable, dry-type units manufactured from centrifugally cast iron.
The block features 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. A one-piece gear case cover is mounted on the front of the block to house the timing gears.
| 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 requiring a specific tightening sequence. The head uses a direct injection configuration. It houses two valves per cylinder: one intake and one exhaust.
Valve seats are induction hardened. 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. Valve stem seals control oil consumption.
| 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 provides fuel supply.
| 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.
Pressurized oil is delivered to the crankshaft main and connecting rod bearings, the camshaft bearings, the rocker arm shaft, and the valve train. The engine oil capacity is 7.6 liters (2.0 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 and cylinder head.
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) to protect against corrosion and
cavitation. Total coolant capacity is 11 liters (2.9 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 varies by application. Air Intake System: Includes a
dry-type, single or two-stage air filter.
Exhaust System: Vertical exhaust outlet is standard.
Engine Management: Mechanical governing; no electronic control unit
present.
| Dimensions and Weight |
Overall Length: 845 mm (33.2 inches).
Overall Width: 519 mm (20.4 inches).
Overall Height: 820 mm (32.2 inches).
Dry Weight: 420 kg (925 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.
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).
| Machinery Applications |
The John Deere 4039D is an industrial power unit engineered for a diverse range of stationary and mobile equipment. Its primary applications include driving generator sets for prime and standby electrical power. The engine is common as a prime mover for high-capacity hydraulic systems in construction machinery such as the John Deere 90E and 290D excavators.
It powers industrial pumps for irrigation, dewatering, and firefighting, notably in units manufactured by Gorman-Rupp. Additional uses include driving air compressors, hydro-seeding equipment, trenchers, and various skid-mounted industrial power units where reliable, mechanically governed diesel power is required.
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