| Engine Model: John Deere PowerTech 4045TF120 |
| Engine Type: 4-stroke in-line 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 275 cu.in (4.5 L) |
| Rated Engine Power: 73-94 Hp (54.5-70 kW) at 1500-1800 rpm |
| Fuel System Type: Direct injection |
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The John Deere 4045TF120 is a 4.5-liter,
four-cylinder turbocharged diesel engine belonging to the John Deere
PowerTech family. This engine is specifically configured for generator
drive applications, serving as a prime power source in stationary and
standby power generation equipment such as the SDMO J66K and AKSA AJD 75
generating sets.
Designed for reliable operation at a constant engine speed, the
4045TF120 incorporates a robust mechanical fuel system with a rotary
injection pump, eliminating the need for electronic controls. This
design choice prioritizes simplicity, durability, and ease of service in
remote or harsh environments where generator sets are frequently
deployed. The engine features a replaceable wet-type cylinder liner
design and heavy-duty internal components, reflecting its
industrial-grade construction.
The 4045TF120 engine is a four-stroke diesel unit featuring an inline
four-cylinder configuration. The engine employs a turbocharger to
increase air density entering the cylinders without charge air cooling
(non-intercooled). The bore-to-stroke ratio is undersquare, a design
that promotes high torque at lower engine speeds, advantageous for
generator applications requiring sustained operation at 1500 or 1800
rpm. The rotation is counterclockwise when viewed from the flywheel end.
Engine Type: Inline 4-cylinder, 4-stroke, turbocharged diesel
Displacement: 4.5 L; 4490 cc (275 cu.in)
Bore: 106.0 mm (4.17 in)
Stroke: 127.0 mm (5.00 in)
Firing Order: 1-3-4-2
Compression Ratio: 17.0:1
Aspiration: Turbocharged
Rated Speed (50 Hz): 1500 rpm
Rated Speed (60 Hz): 1800 rpm
Prime Power (PRP) at 1500 rpm: 63 kW; 84 hp
Standby Power (ESP) at 1500 rpm: 70 kW; 94 hp
Prime Power (PRP) at 1800 rpm: 54.5 kW; 73 hp
Standby Power (ESP) at 1800 rpm: 60 kW; 80 hp
Mean Effective Pressure (BMEP) at Prime Power: 11.2 bar (162 psi)
Mean Effective Pressure (BMEP) at Standby Power: 12.4 bar (180 psi)
Piston Speed at 1500 rpm: 6.35 m/s (20.8 ft/s)
Piston Speed at 1800 rpm: 7.62 m/s (25.0 ft/s)
The cylinder block is constructed from high-grade cast iron, featuring
an open-deck design that accommodates replaceable wet-type cylinder
liners. These wet liners are in direct contact with engine coolant,
providing superior heat dissipation from the combustion zone to the
cooling system. The block incorporates five main bearing webs supporting
a nodular cast iron crankshaft.
The crankshaft is dynamically balanced to reduce vibration during
continuous operation at fixed speeds. Connecting rods are manufactured
from forged steel, selected for their strength and durability under
sustained turbocharged diesel operation. The wet liner design allows
individual liner replacement without removing the engine from the
generator set frame, enabling in-frame overhauls that reduce maintenance
downtime.
The cylinder head is manufactured from cast iron and utilizes a
cross-flow design with intake and exhaust ports on opposite sides of the
head. The combustion chamber is of the direct injection type, with the
bowl-shaped recess formed in the piston crown. The valvetrain employs a
single camshaft located in the cylinder block, operating the valves
through pushrods and rocker arms. This overhead valve (OHV)
configuration provides two valves per cylinder - one intake and one
exhaust.
Valve Arrangement: 2 valves per cylinder (1 intake, 1 exhaust), overhead
valve
Camshaft Drive: Gear-driven from the crankshaft
Valve Lifters: Mechanical flat tappets
Valve Seat Inserts: Induction-hardened steel inserts for durability
The fuel system is a mechanical injection system designed for diesel
combustion. A Stanadyne DB4 rotary distributor-type injection pump is
mounted to the engine and driven by the engine timing gears. This pump
generates high-pressure fuel and distributes it to the individual
injectors in the correct firing order.
The injection pump incorporates a mechanical isochronous governor to
maintain constant engine speed under varying electrical loads, a
critical feature for generator applications where frequency stability is
required. Mechanical injectors are positioned at the cylinder head and
inject fuel directly into the combustion chamber recess in the piston
crown.
Injection Pump Type: Stanadyne DB4 rotary distributor pump
Governor System: Mechanical isochronous governor
Injector Type: Mechanical pencil-type injector
Fuel Consumption at 100% Load (1500 rpm): 16.0 L/h (4.2 gal/h)
Fuel Consumption at 75% Load (1500 rpm): 12.2 L/h (3.2 gal/h)
Fuel Consumption at 50% Load (1500 rpm): 8.1 L/h (2.1 gal/h)
Specific Fuel Consumption at 100% Load: 222 g/kWh (0.365 lb/hp·h)
Fuel Type: Diesel meeting EN 590 specification
Fuel Filter: Spin-on type with integral water separator
The lubrication system is a full-pressure, wet-sump design. A gear-type
oil pump, driven directly from the crankshaft via a gear train, draws
oil from the oil pan through a strainer-type pickup tube. The oil is
pressurized and directed through a full-flow spin-on oil filter before
circulating through main oil galleries to the crankshaft main bearings,
connecting rod bearings, camshaft bearings, and valve mechanism.
The turbocharger receives pressurized oil through a dedicated supply
line, with oil draining back to the crankcase via a gravity-fed return
line. A pressure relief valve maintains system pressure within operating
limits.
Oil Capacity (total system): 13.5 L (14.3 qt)
Oil Capacity (sump only): 12.5 L (13.2 qt)
Recommended Oil Grade: SAE 15W-40 meeting ACEA E2/E3 specification
Oil Consumption at 100% Load: 0.02 L/h (0.021 qt/h)
Minimum Oil Pressure: 1.0 bar (15 psi) at operating temperature
Maximum Oil Pressure: 5.0 bar (73 psi)
Oil Filter Type: Spin-on, full-flow with replaceable paper element
The cooling system is a sealed, pressurized design utilizing a
belt-driven centrifugal water pump mounted to the front of the cylinder
block. The water pump is driven from the crankshaft pulley via a V-belt.
A wax-pellet thermostat regulates coolant temperature by controlling
flow between the engine and the radiator.
The cooling system is designed to accommodate the thermal load generated
by turbocharged operation, with coolant circulating through the cylinder
block surrounding the wet liners for maximum heat transfer. A mechanical
pusher-type engine cooling fan provides forced airflow through the
radiator.
Coolant Capacity (engine with radiator): 23.6 L (24.9 qt)
Coolant Capacity (engine only): 8.5-17.5 L (9.0-18.5 qt)
Thermostat Opening Temperature: 82 °C (180 °F)
Thermostat Full Open Temperature: 94 °C (201 °F)
Maximum Coolant Temperature: 105 °C (221 °F)
Coolant Outlet Temperature (rated): 93 °C (199 °F)
Fan Air Flow: 81 m3/min (2860 ft3/min) at 1500 rpm
Cooling Fan Power Consumption: 2.5 kW (3.4 hp)
Coolant Type: Ethylene glycol-based antifreeze
Turbocharger: A single turbocharger is mounted to the exhaust manifold,
utilizing exhaust gas energy to drive a compressor wheel that
pressurizes intake air. The turbocharger is journal-bearing type and is
oil-cooled only.
Intake System: Intake air is drawn through a dry-type, dual-element air
cleaner before entering the turbocharger compressor inlet. Compressed
air then flows through a cast iron intake manifold to the cylinder head
ports.
Exhaust System: A cast iron exhaust manifold collects exhaust gases from
the cylinder head and directs them to the turbocharger turbine inlet.
Exhaust gas temperature at rated power is 520 °C (968 °F) at 1800 rpm.
Exhaust flow rate is 220 L/s (466 cfm) at rated power.
Electrical System: 12-volt DC system with a belt-driven charging
alternator and an electric starter motor. The battery capacity is 66 Ah.
Starting Aid: A cold start system is incorporated, with glow plugs or an
intake heater enabling cold weather starting. Minimum start temperature
without preheating is -15 °C (5 °F); with preheating is -30 °C (-22 °F).
Operation down to -44 °C (-47 °F) is possible with additional
provisions.
Emissions: This engine is non-emissions regulated or certified to basic
Tier 1 / Stage I standards depending on the production year and region.
Overall Length: 860-890 mm (33.9-35.0 in)
Overall Width: 598-612 mm (23.5-24.1 in)
Overall Height: 980-994 mm (38.6-39.1 in)
Dry Weight (without fluids): 396 kg (873 lb)
Valve Clearance (Cold): Intake and exhaust: 0.30 mm (0.012 in).
Valve Adjustment Interval: Inspect and adjust every 1000 operating
hours.
Engine Oil and Filter Replacement Interval: 500 operating hours.
Fuel Filter Replacement Interval: 500 operating hours.
Primary Air Filter Element: Replacement based on restriction indicator.
Safety Air Filter Element: Replacement as required.
Coolant Replacement Interval: 2000 operating hours or 2 years.
Injection Timing Inspection: Every 2000 operating hours.
Service Life Before Overhaul: 30,000 operating hours.
Cold Start Limit (without preheating): -15 °C (5 °F).
Cylinder Head Bolts: 100 Nm (74 lb-ft)
Main Bearing Cap Bolts: 120 Nm (89 lb-ft)
Connecting Rod Cap Bolts: 60 Nm (44 lb-ft)
Crankshaft Pulley Bolt: 400 Nm (295 lb-ft)
Flywheel / Drive Plate Bolts: 130 Nm (96 lb-ft)
Injection Pump Drive Gear Nut: 60 Nm (44 lb-ft)
Injector Hold-Down Bolts: 60 Nm (44 lb-ft)
Rocker Arm Shaft Bracket Bolts: 35 Nm (26 lb-ft)
Oil Pan Bolts: 25 Nm (18 lb-ft)
Water Pump Bolts: 25 Nm (18 lb-ft)
The John Deere 4045TF120 engine is primarily utilized in stationary
power generation equipment as a generator drive engine. It is also found
in certain agricultural and construction machinery applications.
Generator Sets: SDMO J60U, SDMO J66K, SDMO J70U, SDMO J77K, AKSA AJD 75,
Ingersoll-Rand G 66 R, Ingersoll-Rand G 77. These applications use the
engine configured for either 1500 rpm (50 Hz) or 1800 rpm (60 Hz)
operation.
Agricultural Tractors: John Deere 5415, 5425, 5510, 5520, 5525, 5615,
5625 models.
Construction Equipment: John Deere 310G, 410G, 450H, 550H, 650H backhoe
loaders and crawlers.
Skid Steer Loaders: John Deere 280 and 280 Series II.
Marine Applications: Diesel generator sets for marine use (48 kW
configuration).
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