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John Deere 3029HFG03 Engine

The John Deere 3029HFG03 is a heavy-duty, in-line, 4-cycle PowerTech EWX 2.9L industrial generator drive engine. It is engineered specifically for reliable prime and standby power generation applications. This three-cylinder unit features a compact footprint and is heavily optimized to meet strict emissions compliance frameworks, achieving U.S. EPA / CARB Tier 4 Final and EU Stage IV certifications. Technically advanced for its displacement class, the engine relies on electronic engine controls, a wastegated turbocharger, and air-to-air aftercooling to maintain superior transient response time, high peak torque, and exceptional block load acceptance. To reach emissions mandates without sacrificing fuel efficiency, the engine design incorporates an integrated, single-fluid exhaust filtration system containing a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF).

The cylinder head utilizes a robust overhead 2-valve per cylinder design (1 intake, 1 exhaust) actuated via a traditional mechanical pushrod and rocker arm assembly layout. This mechanical simplicity reduces rotating mass and simplifies valvetrain servicing at workshop intervals. Bore (Cylinder Diameter): 106.5 mm (4.2 in). Stroke (Piston Travel): 110.0 mm (4.3 in). Total Displacement: 2.9 Liters (177 cu in). Compression Ratio: 16.9:1.

Fuel delivery relies on an advanced, electronically governed High-Pressure Common-Rail (HPCR) injection architecture. The system operates under extreme electronic injection pressures scaling up to 2,500 bar (36,000 psi) to ensure precise fuel atomization and complete thermal efficiency. Fuel system protection is maintained by multi-stage spin-on fuel filters containing high-efficiency water-separating media, paired with an integrated electronic prime-and-bleed feature to expedite field service operations.

The engine uses a full-pressure, gear-driven lubrication loop featuring an integrated oil cooler and a spin-on cartridge oil filter. Crankshaft stability is supported by an external crankshaft pulley and harmonic vibration damper assembly. Thermal regulation is managed by a closed-loop, radiator-cooled system with forced liquid circulation. Airflow management is executed via a heavy-duty pusher or puller fan arrangement driven by a dedicated, poly-V fan belt assembly. charge air cooling is achieved via an isolated Air-to-Air Aftercooler (ATAAC) network that drops intake temperatures down to maximize combustion density and lower combustion emissions.

General Technical Data

Engine Specifications

Engine Model ............... John Deere 3029HFG03
Engine Family ............... PowerTech EWX 2.9L
Engine Type ............... 4-cycle inline 3-cylinder common-rail liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 4.19 (106.5)
Engine Stroke, in (mm) ............... 4.33 (110.0)
Displacement, cu.in (L) ............... 177 (2.9)
Rated Engine Power, hp (kW) ............... 48-74 (36-55)
Prime Power Rating, hp (kW) ............... 44-67 (33-50)
Standby Power Rating, hp (kW) ............... 48-74 (36-55)
Rated Engine Speed, rpm ............... 1500-1800
Peak Torque, lb-ft (Nm) ............... 215-224 (292-304) at 1600 rpm
Torque Rise ............... 27-34%
Aspiration Type ............... Turbocharged and air-to-air aftercooled
Compression Ratio ............... 16.9:1
Firing Order ............... 1-2-3
Rotation View from Flywheel ............... Counterclockwise
Crankcase Ventilation ............... Closed system with vent tube
Cylinder Block Type ............... Cast iron with replaceable wet liners
Cylinder Head Type ............... Cast iron 2-valve per cylinder design
Lubrication System ............... Full-pressure system with gear pump
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Liquid-cooled with centrifugal pump
Water Pump Type ............... Belt-driven centrifugal
Air Cleaner Type ............... Dry dual-stage heavy duty elements
Starting System ............... Electric starter motor
Electrical System ............... 12V or 24V
Alternator Capacity ............... 65A or 50A

Fuel System

Injection System Type ............... High-Pressure Common-Rail
Fuel Injection Pump ............... Electronic high-pressure radial piston pump
Maximum Injection Pressure, psi (bar) ............... 23000 (1600)
Fuel Feed Pump Type ............... Gear driven transfer pump
Governor Type ............... Electronic Control Unit integrated
Fuel Filter Part Number ............... R536698
Maximum Fuel Inlet Temperature, F (C) ............... 149 (65)
Fuel Chemistry Specification ............... Ultra Low Sulfur Diesel Fuel only
Governor Regulation Class ............... ISO 8528 G3
Injection Nozzle Type ............... Multi-hole electronic injectors
Leak-off Pipe Arrangement ............... Series connection to return manifold
Fuel Rail Type ............... Forged steel high pressure rail
Pressure Control Valve ............... Pulse width modulated electronic rail valve

Dimensions and Weight

Overall Length, in (mm) ............... 28.1 (715)
Overall Width, in (mm) ............... 23.5 (595)
Overall Height, in (mm) ............... 37.6 (955)
Dry Weight, lbs (kg) ............... 882 (400)
Wet Weight, lbs (kg) ............... 937 (425)

Maintenance Data

Service Information

Compression Pressure, psi (bar) ............... 350-400 (24.1-27.6)
Oil Pressure at Rated Speed, psi (bar) ............... 50 (3.45)
Oil Pressure at Idle Speed, psi (bar) ............... 15 (1.03)
Maximum Oil Temperature, F (C) ............... 239 (115)
Thermostat Start-to-Open Temperature, F (C) ............... 180 (82)
Thermostat Fully Open Temperature, F (C) ............... 201 (94)
Alternator Belt Deflection, New Belt, in (mm) ............... 0.35 (9.0)
Alternator Belt Deflection, Used Belt, in (mm) ............... 0.47 (12.0)
Oil Filter Part Number ............... RE519626
Intake Valve Clearance, Cold, in (mm) ............... 0.014 (0.36)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.018 (0.46)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40, or JD Plus-50
API Service Classifications ......................... CK-4, CJ-4
Engine Oil Capacity, Deep Pan, qt (L) ............... 8.5 (8.0)
Engine Oil Capacity, Shallow Pan, qt (L) ............... 6.3 (6.0)
Cooling System Capacity, qt (L) ............... 6.0 (5.7)

Service Intervals

Change oil and filter ............... Every 500 hours
Inspect air cleaner ............... Every 250 hours
Replace air cleaner ............... Every 1000 hours
Replace fuel filter ............... Every 500 hours
Valve clearance adjustment ............... Every 2000 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 3000 hours
Compression test ............... Every 1500 hours
Inspect belt tension ............... Every 250 hours

Service Specifications

Cylinder Liner Inside Diameter, in (mm) ............... 4.1929-4.1941 (106.500-106.530)
Cylinder Liner Maximum Wear Limit, in (mm) ............... 4.1980 (106.630)
Cylinder Liner Out of Round, in (mm) ............... 0.0020 (0.050)
Cylinder Liner Taper Limit, in (mm) ............... 0.0020 (0.050)
Crankshaft Main Journal Outside Diameter, in (mm) ............... 3.1236-3.1248 (79.340-79.370)
Crankpin Journal Outside Diameter, in (mm) ............... 2.7480-2.7492 (69.800-69.830)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0016-0.0043 (0.041-0.109)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0014-0.0039 (0.036-0.099)
Crankshaft End Play, in (mm) ............... 0.0028-0.0142 (0.070-0.360)
Connecting Rod Side Play, in (mm) ............... 0.0047-0.0122 (0.120-0.310)
Main Bearing Bore Inside Diameter, in (mm) ............... 3.3268-3.3280 (84.500-84.530)
Piston Skirt Outside Diameter, in (mm) ............... 0.787 (20.0)
Piston Pin Bore Diameter, in (mm) ............... 1.6254-1.6258 (41.285-41.295)
Piston Pin Outer Diameter, in (mm) ............... 1.6248-1.6250 (41.270-41.275)
Piston Pin to Bore Clearance, in (mm) ............... 0.0016 (0.040)
Second Ring Groove Width, in (mm) ............... 0.0957-0.0965 (2.430-2.450)
Oil Ring Groove Width, in (mm) ............... 0.1583-0.1591 (4.020-4.040)
Top Ring Groove Clearance, in (mm) ............... 0.0055 (0.140)
Second Ring Groove Clearance, in (mm) ............... 0.0047 (0.120)
Oil Ring Groove Clearance, in (mm) ............... 0.0039 (0.100)
Top Ring End Gap, in (mm) ............... 0.0118-0.0216 (0.300-0.550)
Second Ring End Gap, in (mm) ............... 0.0236-0.0354 (0.600-0.900)
Oil Ring End Gap, in (mm) ............... 0.0118-0.0216 (0.300-0.550)
Cylinder Head Flatness Distortion, in (mm) ............... 0.0039 (0.100)
Cylinder Block Deck Flatness, in (mm) ............... 0.0039 (0.100)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.3134-0.3142 (7.960-7.980)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.3126-0.3134 (7.940-7.960)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.3154-0.3165 (8.010-8.040)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.3154-0.3165 (8.010-8.040)
Valve Seat Angle, Degrees ............... 45 degrees
Valve Face Angle, Degrees ............... 45 degrees
Valve Spring Free Length, in (mm) ............... 2.1650 (55.00)
Camshaft Journal Outside Diameter, in (mm) ............... 2.2031-2.2043 (55.960-55.990)
Camshaft Bearing Inside Diameter, in (mm) ............... 2.2063-2.2083 (56.040-56.090)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0020-0.0051 (0.050-0.130)
Camshaft End Play, in (mm) ............... 0.0024-0.0071 (0.060-0.180)
Cam Lobe Height (Intake), in (mm) ............... 0.2677 (6.800)
Cam Lobe Height (Exhaust), in (mm) ............... 0.2756 (7.000)
Rocker Arm Shaft Outer Diameter, in (mm) ............... 0.7862-0.7870 (19.970-19.990)
Rocker Arm Bushing Inside Diameter, in (mm) ............... 0.7882-0.7894 (20.020-20.050)
Valve Tappet Body Outside Diameter, in (mm) ............... 1.2575-1.2583 (31.940-31.960)
Valve Tappet Bore Block Guide Diameter, in (mm) ............... 1.2598-1.2610 (32.000-32.030)
Idler Gear Bushing Inside Diameter, in (mm) ............... 1.5012-1.5024 (38.130-38.160)
Idler Gear Shaft Outside Diameter, in (mm) ............... 1.4988-1.4996 (38.070-38.090)

Tightening Torques

Cylinder Head Cap Screws (1-Stage), lb-ft (Nm) ............... 44 (60)
Cylinder Head Cap Screws (2-Stage), lb-ft (Nm) ............... 85 (115)
Main Bearing Cap Screws (1-Stage), lb-ft (Nm) ............... 59 (80)
Main Bearing Cap Screws (2-Stage), lb-ft (Nm) ............... 103 (140)
Connecting Rod Journal Bolts (1-Stage), lb-ft (Nm) ............... 26 (35)
Connecting Rod Journal Bolts (2-Stage), lb-ft (Nm) ............... 52 (70)
Flywheel Mounting Cap Screws, lb-ft (Nm) ............... 85 (115)
Flywheel Housing to Block Fasteners, lb-ft (Nm) ............... 37 (50)
Crankshaft Damper Pulley Center Bolt, lb-ft (Nm) ............... 207 (280)
Camshaft Thrust Plate Retaining Bolts, lb-ft (Nm) ............... 26 (35)
Camshaft Drive Gear Retention Bolt, lb-ft (Nm) ............... 111 (150)
Rocker Arm Shaft Support Fasteners, lb-ft (Nm) ............... 26 (35)
Valve Cover Retaining Fasteners, lb-ft (Nm) ............... 11 (15)
Timing Gear Cover Assembly Fasteners, lb-ft (Nm) ............... 26 (35)
Oil Pan Structure Mounting Bolts, lb-ft (Nm) ............... 26 (35)
Oil Pan Central Drain Plug Fastener, lb-ft (Nm) ............... 37 (50)
Oil Pump Assembly Retention Bolts, lb-ft (Nm) ............... 26 (35)
Oil Cooler Internal Element Retaining Nut, lb-ft (Nm) ............... 33 (45)
Water Pump Assembly Body Fasteners, lb-ft (Nm) ............... 26 (35)
Thermostat Cover Retaining Fasteners, lb-ft (Nm) ............... 26 (35)
Exhaust Manifold Mounting Fasteners (1-Stage), lb-ft (Nm) ............... 15 (20)
Exhaust Manifold Mounting Fasteners (2-Stage), lb-ft (Nm) ............... 33 (45)
Turbocharger Housing Mounting Nuts, lb-ft (Nm) ............... 33 (45)
High Pressure Fuel Rail Mounting Fasteners, lb-ft (Nm) ............... 26 (35)
Electronic Fuel Injector Hold Down Clamp Bolt, lb-ft (Nm) ............... 22 (30)
Fuel Injection Pump Drive Gear Nut, lb-ft (Nm) ............... 63 (85)
Fuel Transfer Pump Body Mounting Bolts, lb-ft (Nm) ............... 18 (25)
Fuel Supply Line Union Banjo Fittings, lb-ft (Nm) ............... 20 (27)
Starter Motor Mounting Flange Nuts, lb-ft (Nm) ............... 33 (45)
Alternator Pivot Base Mounting Bolt, lb-ft (Nm) ............... 37 (50)
Alternator Tension Strut Link Bolt, lb-ft (Nm) ............... 26 (35)
Intake Manifold Top Cover Fasteners, lb-ft (Nm) ............... 22 (30)
Crankcase Vent Tube Assembly Clamp Bolt, lb-ft (Nm) ............... 7 (10)
Engine Mount Front Bracket Fasteners, lb-ft (Nm) ............... 63 (85)
Engine Mount Rear Block Face Fasteners, lb-ft (Nm) ............... 63 (85)
Fan Drive Pulley Assembly Retention Hub Bolts, lb-ft (Nm) ............... 37 (50)
Oil Pressure Sensor Sending Unit Body, lb-ft (Nm) ............... 11 (15)
Coolant Temperature Sensor Body Housing, lb-ft (Nm) ............... 15 (20)
Air Intake Heater Element Base Nut, lb-ft (Nm) ............... 22 (30)
Exhaust Gas Recirculation Pipe Connection Flange, lb-ft (Nm) ............... 26 (35)
Diesel Oxidation Catalyst Assembly V-Band Coupling, lb-ft (Nm) ............... 9 (12)
Diesel Particulate Filter Housing Flange Fasteners, lb-ft (Nm) ............... 22 (30)
Electronic Engine Control Unit Base Bracket Bolts, lb-ft (Nm) ............... 18 (25)
Crankshaft Rear Oil Seal Carrier Bolts, lb-ft (Nm) ............... 11 (15)
Front Crankshaft Wear Sleeve Drive Force Depth, in (mm) ............... 0.12 (3.0)
Piston Cooling Orifice Jet Nozzle Body Screw, lb-ft (Nm) ............... 9 (12)
Main Oil Gallery End Core Plugs, lb-ft (Nm) ............... 26 (35)

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