John Deere 4239D Specifications
| Engine Model: John Deere 4239D |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 239 cu.in (3.9 L) |
| Rated Engine Power: 50-100 Hp (37-75 kW) at 2500 rpm |
| Fuel System Type: Direct fuel injection |
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The John Deere 4239D is a 3.9-liter,
four-cylinder, naturally aspirated diesel engine engineered for
demanding industrial and agricultural applications. This direct
injection power plant is recognized for its robust construction,
mechanical fuel system reliability, and a broad power output range
suitable for diverse equipment. Its design philosophy emphasizes
serviceability and operational durability in harsh environments, from
construction sites to agricultural fields.
The engine features a wet sleeve cylinder design, a gear-driven
camshaft, and a pressure lubrication system. The 4239D delivers
dependable performance in applications requiring between 50 and 100 Hp,
with specific tuning governed by mechanical settings. This engine's
architecture provides a proven, service-friendly power source for
original equipment manufacturers.
Engine Type: 4-cylinder, inline, 4-stroke cycle, vertical, liquid-cooled
diesel.
Combustion System: Direct injection.
Aspiration: Naturally aspirated.
Rotation: Counterclockwise when viewed from the flywheel end.
Firing Order: 1-3-4-2.
Bore: 106.5 mm (4.19 inches).
Stroke: 110.0 mm (4.33 inches).
Displacement: 3.9 liters (239 cubic inches).
Compression Ratio: 16.5:1.
Governor Type: Mechanical, all-speed or minimum-maximum, dependent on
application.
Power Output Range: 37 to 75 kW (50 to 100 Hp) across various governed
speeds and application configurations.
Maximum Torque Output: Application-specific; a common rating is
approximately 305 Nm (225 lb-ft).
High Idle Speed: Variable, set between 2300 and 2800 crankshaft rpm
based on equipment requirements.
Low Idle Speed: 750 to 800 crankshaft rpm.
Fuel Shutoff: Mechanical or electric solenoid, dependent on application.
Dry Weight (Approximate, base engine): 181 kg (400 lbs).
The cylinder block is a high-strength, single-piece gray iron casting.
It employs a deep-skirt design for exceptional rigidity and reduced
vibration transmission. The block incorporates replaceable, press-fit
wet-type cylinder sleeves manufactured from centrifugally cast alloy
iron. This wet sleeve design allows for direct coolant contact with the
sleeve exterior, promoting efficient heat transfer.
The crankshaft is supported by five main bearings with steel-backed,
aluminum alloy bearing inserts. Main bearing caps are ductile iron,
secured with two vertical bolts each. The block features
precision-machined crank and camshaft bores, along with internal oil
galleries and coolant passages. A one-piece rear seal housing is
integral to the block casting.
The cylinder head is a single-piece, cast iron component with a
crossflow port arrangement. It is secured to the block with high-tensile
strength cap screws. The head accommodates two valves per cylinder: one
intake and one exhaust. Valve seats are induction-hardened for wear
resistance. Intake valves are manufactured from chrome-plated steel,
while exhaust valves feature Stellite-faced heads to endure elevated
exhaust temperatures.
Valve guides are replaceable. Valve actuation uses individual,
shaft-mounted rocker arms. Valve lash is adjusted via screw-type
adjusters on the rocker arms. The camshaft, located in the cylinder
block, operates the valves through solid lifters and pushrods. A
multilayer steel head gasket provides the seal between the cylinder head
and block.
The fuel system is a direct injection, pump-line-nozzle configuration. A
camshaft-driven, plunger-type transfer pump draws fuel from the tank.
Fuel passes through a primary filter with a sediment bowl and a
secondary spin-on canister filter. The injection pump is an in-line,
plunger-type unit (such as a John Deere or Robert Bosch model) with an
integral mechanical governor.
The governor controls fuel rack position to maintain the set engine
speed under load variations. Separate high-pressure steel lines connect
each pump plunger outlet to its corresponding injector. The injectors
are multi-hole, pencil-type units that create a fine fuel spray directly
into the combustion chamber. Fuel shutoff is executed either by a manual
lever acting on the pump rack or by a 12-volt electric solenoid.
The lubrication system is a full-pressure, gear-driven design. A
gear-type oil pump, driven from the crankshaft gear train, draws oil
from the oil pan through a pickup tube and screen. Pressurized oil is
routed through a full-flow, spin-on oil filter. Filtered oil is
distributed through main galleries in the block to the crankshaft main
bearings, connecting rod bearings, and camshaft bearings.
A dedicated passage supplies oil to the rocker arm shaft. Connecting
rods incorporate squirt holes to lubricate cylinder walls and piston
pins. A piston cooling jet sprays oil onto the underside of each piston
crown. A pressure relief valve within the oil pump housing maintains
system pressure. Total oil system capacity is 8.5 liters (9.0 U.S.
quarts) with filter. Engine oil meeting performance classification CF-4
or higher is specified.
The cooling system is a pressurized, liquid-cooled, pump-circulated
design. A centrifugal water pump, gear-driven from the front of the
engine, circulates coolant. Coolant flow is directed first through the
cylinder block, around the wet sleeves, then upward into the cylinder
head, and finally to the radiator or heat exchanger. A wax-pellet-type
thermostat regulates coolant temperature.
System pressure is maintained by a radiator pressure cap, generally
rated for 83 kPa (12 psi). Airflow across the heat exchanger is provided
by a belt-driven fan or an application-specific hydraulic or electric
fan. The total coolant capacity is 12.5 liters (13.2 U.S. quarts). A
50/50 mixture of ethylene-glycol antifreeze and distilled water is
required.
Electrical System: The engine employs a 12-volt electric starting
system. A 12-volt alternator, belt-driven from the crankshaft pulley,
provides charging current. Intake manifold glow plugs, controlled by a
key-switch timer, aid cold-weather starting.
Air Intake System: A dry-type, replaceable paper element air cleaner is
standard. The intake manifold is a cast iron component. Exhaust System:
The exhaust manifold is a one-piece cast iron design.
Flywheel and Housing: The engine uses a SAE standard flywheel housing.
The flywheel is a machined cast iron component with a ring gear.
Configuration is application-specific.
Compression Release: A manual compression release mechanism, integrated
into the valve train, is present to reduce cranking effort during
starting.
Overall Length (Front of vibration damper to rear face of flywheel
housing): 838 mm (33.0 inches)
Overall Width (Maximum at exhaust manifold side): 660 mm (26.0 inches).
Overall Height (Top of valve cover to bottom of oil pan rail): 775 mm
(30.5 inches).
Dry Weight (Base engine, less coolant and oil, standard accessories):
181 kg (400 lbs).
Engine Oil Change Interval: 250 service hours or 6 months, whichever
occurs first. Intervals may be reduced in severe dust or high-load
conditions. Oil Filter Change: Replace with every oil change. Fuel
Filter Service: Drain primary sediment bowl daily; replace secondary
filter element every 500 service hours. Air Filter Element Service:
Clean using dry methods every 100 service hours; replace element based
on restriction gauge or visual inspection. Coolant Change Interval: 3000
service hours or 3 years.
Valve Lash Adjustment (Cold Engine Setting): Intake valve: 0.36 mm
(0.014 inches); Exhaust valve: 0.46 mm (0.018 inches). Inspect and
adjust every 1000 service hours. Fuel Injection Pump Timing: Verify and
set per factory specification during major service or component
replacement. Injection Nozzle Service: Test spray pattern and opening
pressure every 2000 service hours. Fan Drive Belt Tension: Adjust to
provide 13 mm (0.5 inches) of mid-span deflection under moderate thumb
pressure.
Cylinder Head Bolts: Torque in specified sequence to 95 Nm (70 lb-ft),
then final tighten an additional 90-degree turn. Main Bearing Cap Bolts:
160 Nm (118 lb-ft).
Connecting Rod Cap Nuts: 85 Nm (63 lb-ft), then final tighten an
additional 60-degree turn.
Flywheel to Crankshaft Bolts: 115 Nm (85 lb-ft).
Rocker Arm Shaft Bracket Bolts: 55 Nm (41 lb-ft).
Injector Clamp Bolt: 35 Nm (26 lb-ft).
Oil Pan Bolts: 24 Nm (18 lb-ft).
Water Pump Mounting Bolts: 40 Nm (30 lb-ft).
The John Deere 4239D engine is a power source for a range of heavy-duty
mobile and industrial equipment. In construction machinery, it is
famously employed in the John Deere 210C and 310C backhoe loader models.
It also powers various street and airport sweeper units manufactured by
TYMCO. Within agricultural and industrial contexts, this engine finds
use in irrigation pump sets, stationary generators, agricultural
tractors, and small industrial power units.
Its mechanical fuel system and robust construction make it a preferred
choice for original equipment manufacturers and end-users in markets
where technical support infrastructure favors mechanically controlled,
serviceable diesel engines. The engine's adaptability across a 50 to 100
Hp range allows it to meet diverse operational demands.
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