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John Deere 3029D Engine

The John Deere 3029D is a 2.9-liter, 3-cylinder, vertical in-line, naturally aspirated, 4-stroke industrial and agricultural diesel engine belonging to the John Deere Series 300 / PowerTech family. Known for its heavy-duty reliability under extreme operating conditions, it features a rugged cylinder block supported by four main bearings and individual, replaceable "wet" cylinder liners. The engine utilizes high-grade cast aluminum alloy pistons designed with internal ribbing and cam-ground skirts to control thermal expansion during high-load operations.

The engine employs a valve-in-head (overhead valve) configuration featuring two valves per cylinder. Operational adjustments are performed cold. The specified initial valve clearance check is required at 400 hours, followed by standard maintenance intervals of every 1200 hours or two years. Bore: 106.5 mm (4.19 in). Stroke: 110 mm (4.33 in). Total Displacement: 2.9 Liters (179 cubic inches). Compression Ratio: 18.5:1. Cylinder Firing Order: 1-2-3.

Fuel delivery is managed via a direct injection system featuring a timing gear-driven, rotary-type injection pump. Fuel is atomized into the combustion bowl of the piston crown through 9.5 mm injection nozzles mounted vertically in the cylinder head. A built-in mechanical variable speed governor controls the output, and an integrated cold start advance system modifies fuel timing to facilitate easier ignition during low-temperature environments. Standard fuel injection pump timing is set to 13 deg BTDC. The required fuel specification is standard diesel meeting EN 590 or ASTM D975 standards with a minimum cetane index of 40.

The lubrication system is a full-pressure system driven by a dedicated oil pump. The manufacturer prefers the use of John Deere PLUS-50 high-performance engine oil. A maximum break-in interval of 100 hours is required for the initial oil and filter change. Under normal operation, the minimum allowable oil pressure is 103 kPa (15 psi) at a low idle of 850 RPM, and a minimum of 140 kPa (20 psi) is standard for safety circuits. The engine features a liquid-cooled setup incorporating a forced-circulation water pump, standard radiator, and thermostat. The normal operating coolant temperature ranges between 82C and 94C (180F to 201F). System integrity requires pressure testing at 50 kPa (7 psi).

General Technical Data

Engine Specifications

Engine Manufacturer ............... John Deere
Engine Model ............... 3029D
Engine Type ............... 4-stroke inline 3-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... In-line vertical
Engine Bore, in (mm) ............... 4.1929 (106.5)
Engine Stroke, in (mm) ............... 4.3307 (110.0)
Displacement, cu.in (L) ............... 179.4 (2.94)
Rated Engine Power, hp (kW) ............... 40-50 (29.4-37.3)
Rated Engine Speed, rpm ............... 2100
Max Engine Speed, rpm ............... 2500 +/-50
Low Idle Speed, rpm ............... 850 +/-50
Fast Idle Speed, rpm ............... 2500 +/-50
Operating Speed Range, rpm ............... 800-2550
Optimal Working Range, rpm ............... 1400-2300
Peak Torque, lb-ft (Nm) ............... 109.3 (148.2) at 1600 rpm
Aspiration Type ............... Naturally Aspirated
Compression Ratio ............... 18.5:1
Firing Order ............... 1-2-3
Combustion Chamber ............... Direct injection bowl-in-piston design
Cylinder Block Material ............... High-strength cast iron
Cylinder Head Material ............... Cast iron alloy
Valves Per Cylinder ............... 2
Lubrication System ............... Full-pressure lubrication with piston spray cooling jets
Oil Pump Type ............... Gear-driven displacement pump
Oil Filter Type ............... Full-flow spin-on cartridge
Cooling System ............... Liquid-cooled with pressurized radiator
Water Pump Type ............... Belt-driven centrifugal pump
Air Cleaner Type ............... Dry dual-stage element with evacuator valve
Starting System Type ............... Electric starter motor
Electrical System Voltage, V ............... 12
Alternator Amperage, A ............... 40

Fuel System

Fuel Injection Pump Model ............... Stanadyne DB2 or DB4 rotary pump
Fuel Injection Pump Drive ............... Gear driven via front timing train
Static Injection Pump Timing ............... 13 deg BTDC
Fuel Transfer Pump Type ............... Mechanical diaphragm pump
Fuel Transfer Pump Pressure, psi (bar) ............... 3.0-5.8 (0.21-0.40)
Fuel Injection Nozzle Type ............... Multi-hole pencil nozzle design
Fuel Injection Nozzle Opening Pressure, psi (bar) ............... 3200-3400 (220.6-234.4)
Fuel Injection Nozzle Orifice Number ............... 4 or 5 holes
Fuel Injection Nozzle Spray Angle ............... 140 deg
Governor Type ............... Mechanical centrifugal governor
Fuel Filter Type ............... Spin-on element with water separator reservoir
Fuel Inlet Valve Position ............... Manual rotary on or off selector valve
Fuel Injection Line Wall Thickness, in (mm) ............... 0.078 (2.0)
Fuel Injection Line Outside Diameter, in (mm) ............... 0.250 (6.35)
Injection Nozzle Holder Diameter, in (mm) ............... 0.374 (9.5)
Recommended Fuel Grade ............... Ultra-low sulfur diesel ASTM D975 No. 2-D

Dimensions and Weight

Overall Length, in (mm) ............... 25.7 (655)
Overall Width, in (mm) ............... 21.8 (555)
Overall Height, in (mm) ............... 31.3 (795)
Dry Weight, lbs (kg) ............... 743 (337)
Wet Weight, lbs (kg) ............... 798 (362)

Maintenance Data

Service Information

Compression Pressure at Cranking Speed, psi (bar) ............... 350-400 (24.1-27.6)
Oil Pressure at Rated Speed, psi (bar) ............... 40-60 (2.75-4.13)
Oil Pressure at Low Idle, psi (bar) ............... 15 (1.03)
Maximum Permissible Oil Temperature, F (C) ............... 239 (115)
Thermostat Start-to-Open Temperature, F (C) ............... 180 (82)
Thermostat Fully Open Temperature, F (C) ............... 202 (94)
Maximum Coolant Temperature, F (C) ............... 212 (100)
Radiator Cap Pressure Rating, psi (bar) ............... 10 (0.69)
Alternator Belt Deflection (Under 20 lb Force), in (mm) ............... 0.375-0.500 (9.5-12.7)
Intake Valve Clearance, in (mm) ............... 0.014 (0.35)

Exhaust Valve Clearance, in (mm) ............... 0.018 (0.45)


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 with Filter, qt (L) ............... 8.5 (8.0)
Engine Oil Capacity without Filter, qt (L) ............... 7.9 (7.5)
Cooling System Capacity, Engine Only, qt (L) ............... 6.3 (6.0)

Service Intervals

Change oil and filter ............... Every 250 hours
Inspect air cleaner ............... Every 200 hours
Replace air cleaner ............... Every 1000 hours
Replace fuel filter ............... Every 500 hours
Valve clearance adjustment ............... Every 1000 hours
Fuel system inspection ............... Every 1000 hours
Change coolant ............... Every 2000 hours
Compression test ............... Every 1000 hours
Inspect belt tension ............... Every 250 hours

Service Specifications

Cylinder Bore Inside Diameter, in (mm) ............... 4.1929-4.1941 (106.500-106.530)
Cylinder Bore Max Wear Limit, in (mm) ............... 4.1980 (106.629)
Cylinder Bore Out-of-Round, in (mm) ............... 0.002 (0.051)
Cylinder Bore Taper Wear Limit, in (mm) ............... 0.002 (0.051)
Connecting Rod Center-to-Center Length, in (mm) ............... 7.913 (201.0)
Connecting Rod Small End Bushing I.D, in (mm) ............... 1.3756-1.3764 (34.940-34.961)
Connecting Rod Big End Bore Diameter, in (mm) ............... 2.9150-2.9160 (74.041-74.066)
Connecting Rod Journal Outside Diameter, in (mm) ............... 2.7480-2.7490 (69.799-69.825)
Connecting Rod Bearing Oil Clearance, in (mm) ............... 0.0014-0.0035 (0.036-0.089)
Connecting Rod Side Play, in (mm) ............... 0.003-0.011 (0.076-0.279)
Crankshaft Main Journal Outside Diameter, in (mm) ............... 3.1230-3.1240 (79.324-79.350)
Crankshaft Main Bearing Bore in Block, in (mm) ............... 3.2955-3.2965 (83.706-83.731)
Crankshaft Main Bearing Oil Clearance, in (mm) ............... 0.0016-0.0038 (0.041-0.097)
Crankshaft End Play, in (mm) ............... 0.001-0.014 (0.025-0.356)
Piston Skirt Outside Diameter, in (mm) ............... 4.1885-4.1895 (106.388-106.413)
Piston Skirt to Cylinder Liner Clearance, in (mm) ............... 0.0034-0.0056 (0.086-0.142)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.3752-1.3755 (34.930-34.938)
Piston Pin Outside Diameter, in (mm) ............... 1.3748-1.3750 (34.920-34.925)
Piston Pin to Piston Bore Clearance, in (mm) ............... 0.0002-0.0007 (0.005-0.018)
Piston Pin to Con Rod Bushing Clearance, in (mm) ............... 0.0006-0.0016 (0.015-0.041)
Top Ring Groove Width, in (mm) ............... 0.0965-0.0980 (2.451-2.489)
Second Ring Groove Width, in (mm) ............... 0.0957-0.0969 (2.431-2.461)
Oil Ring Groove Width, in (mm) ............... 0.1878-0.1890 (4.770-4.801)
Top Ring Side Clearance, in (mm) ............... 0.005 (0.127)
Second Ring Side Clearance, in (mm) ............... 0.004 (0.102)
Oil Ring Side Clearance, in (mm) ............... 0.003 (0.076)
Top Ring End Gap, in (mm) ............... 0.011-0.021 (0.279-0.533)
Second Ring End Gap, in (mm) ............... 0.010-0.020 (0.254-0.508)
Oil Ring End Gap, in (mm) ............... 0.010-0.022 (0.254-0.559)
Intake Valve Stem Outside Diameter, in (mm) ............... 0.3115-0.3122 (7.912-7.930)
Exhaust Valve Stem Outside Diameter, in (mm) ............... 0.3106-0.3114 (7.889-7.910)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0013-0.0035 (0.033-0.089)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0021-0.0044 (0.053-0.112)
Valve Guide Inside Diameter, in (mm) ............... 0.3135-0.3150 (7.963-8.001)
Intake Valve Seat Angle, deg ............... 30
Exhaust Valve Seat Angle, deg ............... 45
Intake Valve Face Angle, deg ............... 30
Exhaust Valve Face Angle, deg ............... 45
Valve Spring Free Length, in (mm) ............... 2.120 (53.85)
Camshaft Journal Outside Diameter (№1), in (mm) ............... 2.2031-2.2041 (55.959-55.984)
Camshaft Journal Outside Diameter (№2), in (mm) ............... 2.1931-2.1941 (55.705-55.730)
Camshaft Journal Outside Diameter (№3), in (mm) ............... 2.1831-2.1841 (55.451-55.476)
Camshaft Bushing Inside Diameter, in (mm) ............... 2.2055-2.2075 (56.020-56.071)
Camshaft Journal Oil Clearance, in (mm) ............... 0.0014-0.0044 (0.036-0.112)
Camshaft End Play, in (mm) ............... 0.003-0.009 (0.076-0.229)
Cam Lobe Lift (Intake), in (mm) ............... 0.265 (6.731)
Cam Lobe Lift (Exhaust), in (mm) ............... 0.272 (6.909)
Rocker Arm Shaft Outside Diameter, in (mm) ............... 0.785-0.786 (19.939-19.964)
Rocker Arm Bushing Bore Inside Diameter, in (mm) ............... 0.787-0.789 (19.990-20.041)
Rocker Arm to Shaft Radial Clearance, in (mm) ............... 0.0010-0.0035 (0.025-0.089)
Idler Gear Bushing Inside Diameter, in (mm) ............... 1.501-1.503 (38.125-38.176)
Idler Gear Shaft Outside Diameter, in (mm) ............... 1.498-1.499 (38.049-38.075)

Tightening Torques

Cylinder Head Cap Screw (Step One), lb-ft (Nm) ............... 75 (102)
Cylinder Head Cap Screw (Step Two), lb-ft (Nm) ............... 110 (150)
Main Bearing Cap Screw Fasteners, lb-ft (Nm) ............... 100 (136)
Connecting Rod Bolt Fasteners, lb-ft (Nm) ............... 40 (54)
Rocker Arm Shaft Clamp Cap Screw Fasteners, lb-ft (Nm) ............... 35 (47)
Rocker Arm Cover Installation Fasteners, lb-in (Nm) ............... 96 (11)
Flywheel to Crankshaft Fasteners, lb-ft (Nm) ............... 85 (115)
Flywheel Housing to Cylinder Block Fasteners, lb-ft (Nm) ............... 85 (115)
Crankshaft Front Pulley Cap Screw Center Bolt, lb-ft (Nm) ............... 150 (203)
Timing Gear Cover Installation Fasteners, lb-ft (Nm) ............... 26 (35)
Engine Front Plate to Cylinder Block Fasteners, lb-ft (Nm) ............... 26 (35)
Camshaft Thrust Plate Retaining Fasteners, lb-ft (Nm) ............... 26 (35)
Camshaft Timing Gear Drive Bolt, lb-ft (Nm) ............... 60 (81)
Upper Idler Gear Retaining Shaft Bolt, lb-ft (Nm) ............... 44 (60)
Lower Idler Gear Retaining Shaft Bolt, lb-ft (Nm) ............... 44 (60)
Oil Pump Assembly to Cylinder Block Bolts, lb-ft (Nm) ............... 26 (35)
Oil Pan Steel Drain Plug Threaded Shank, lb-ft (Nm) ............... 52 (70)
Oil Pan Perimeter Frame Fasteners, lb-ft (Nm) ............... 26 (35)
Exhaust Manifold Mounting Nuts and Cap Screws, lb-ft (Nm) ............... 35 (47)
Intake Manifold Mounting Structural Fasteners, lb-ft (Nm) ............... 26 (35)
Fuel Injection Pump Drive Gear Retaining Nut, lb-ft (Nm) ............... 60 (81)
Fuel Injection Pump Core Housing to Front Plate Nuts, lb-ft (Nm) ............... 20 (27)
Fuel Injection Pencil Nozzle Clamp Holding Screw, lb-ft (Nm) ............... 26 (35)
Fuel Transfer Pump Attachment Fasteners, lb-ft (Nm) ............... 20 (27)
Fuel High Pressure Line Union Nut Links, lb-ft (Nm) ............... 22 (30)
Water Pump Assembly to Front Engine Plate Bolts, lb-ft (Nm) ............... 26 (35)
Thermostat Housing Attachment Fasteners, lb-ft (Nm) ............... 26 (35)
Alternator Mounting Structural Support Pivots, lb-ft (Nm) ............... 35 (47)
Alternator Tension Adjusting Brace Lock Screw, lb-ft (Nm) ............... 20 (27)
Starter Motor Flange Mounting Stud Nuts, lb-ft (Nm) ............... 35 (47)
Fan Pulley Hub Hub Hub Face Assembly Fasteners, lb-ft (Nm) ............... 20 (27)
Oil Cooler Internal Element Core Housing Bolts, lb-ft (Nm) ............... 20 (27)
Piston Spray Cooling Jet Valve Fittings, lb-in (Nm) ............... 84 (9.5)
Crankcase Vent Breather Tube Support Brackets, lb-in (Nm) ............... 96 (11)
Air Intake Tube Connector Band Hose Clamps, lb-in (Nm) ............... 45 (5)
Radiator Shroud and Frame Assembly Fasteners, lb-ft (Nm) ............... 20 (27)

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