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John Deere 3179DF Engine

The John Deere 3179DF is a heavy-duty, 3-cylinder, naturally aspirated diesel engine belonging to the legendary John Deere Series 300 OEM engine line. Known for its robust, simplified construction, this 2.9-liter (179 cubic inches) power plant is engineered for industrial equipment, agricultural machinery, and stationary auxiliary applications. The "DF" designation indicates a standard naturally aspirated configuration with a direct-injection combustion system, providing a highly reliable balance of fuel economy and low-end torque without the complexity of a turbocharger.

The engine uses an overhead valve (OHV) design actuated by a camshaft, pushrods, and a dedicated rocker arm assembly. It relies on a mechanical flat-tappet system with two valves per cylinder. To maintain proper timing and seat clearance, perform adjustments when the engine is cold. The cylinder bore dimension is exactly 106.5 mm (4.19 in). The piston stroke length measures 110.0 mm (4.33 in). This creates an undersquare geometry optimized for high torque output at low engine speeds, operating with a fixed compression ratio of 16.2:1.

Fuel System: The 3179DF utilizes a highly precise, mechanical direct-injection fuel system. Fuel delivery is controlled by a timing-gear-driven Stanadyne DB2 rotary fuel injection pump. The rotary pump pressurizes fuel and distributes it through rigid, high-pressure fuel injection lines directly to the mechanical fuel injectors seated in the cylinder head. Fuel is sprayed directly into the piston bowl configuration for maximum combustion efficiency. Pre-injection filtration relies on a primary fuel transfer pump feeding through a multi-stage water separator sediment bowl and a secondary fine element filter to prevent contaminants from reaching the tight tolerances of the high-pressure rotary pump assembly.

Lubrication System: Lubrication is managed via a full-pressure, gear-driven oil pump that forces oil through a spin-on full-flow filter bypass system to lubricate the main bearings, connecting rods, and overhead valve train. During initial engine commissioning or after a complete rebuild, factory guidelines dictate the use of specialized John Deere engine break-in oil for the first 100 hours of operation. Standard high-performance oils must be avoided during this break-in window to ensure the piston rings seat correctly against the cylinder liners. A full oil and filter change is required immediately following this initial 100-hour milestone.

Cooling System: The engine uses a pressurized, liquid-forced cooling system circulated by a heavy-duty, belt-driven centrifugal water pump. System temperature is regulated by an inline mechanical thermostat. The coolant mixture requirement is a 50/50 solution of high-quality water and ethylene glycol antifreeze. To inhibit cylinder liner pitting and internal scale corrosion, the mixture must be treated with a 3% concentration of Supplemental Coolant Additives (SCA), utilizing approved formulas like John Deere TY16004 or TY16005. Service levels are monitored at the coolant recovery tank, where fluid must rest at the low line when cold and fill up to the designated high marker when operating at thermal equilibrium.

General Technical Data

Engine Specifications

Engine Model ............... John Deere 3179DF
Engine Type ............... 4-cycle inline 3-cylinder direct injection liquid-cooled diesel
Number of Cylinders ............... 3
Cylinder Arrangement ............... Vertical in-line
Engine Bore, in (mm) ............... 4.1929 (106.5)
Engine Stroke, in (mm) ............... 4.3280 (110.0)
Displacement, cu.in (L) ............... 179 (2.9)
Rated Engine Power, hp (kW) ............... 56-65 (42-48.5)
Rated Engine Speed, rpm ............... 2200-2500
Peak Torque ............... 153 lb-ft (207 Nm) at 1400-1600 rpm
Low Idle Speed ............... 800-850 rpm
High Idle Speed ............... 2400-2700 rpm
Aspiration Type ............... Naturally Aspirated
Compression Ratio ............... 16.2:1
Firing Order ............... 1-2-3
Cylinder Block Type ............... Cast iron mono-block with replaceable wet liners
Cylinder Head Type ............... Cast iron single piece cross-flow overhead valve design
Crankshaft Rotation ............... Counterclockwise viewed from flywheel end
Lubrication System ............... Full-pressure circulation with gear pump supply
Oil Pump Type ............... Gear-driven internal component mesh
Oil Filter Type ............... Full-flow spin-on cartridge layout
Cooling System ............... Liquid-cooled with bypass thermostat circuit
Water Pump Type ............... Belt-driven centrifugal impeller module
Air Cleaner Type ............... Dry heavy-duty dual-stage element housing
Starting System ............... Electric starter motor engagement
Electrical System ............... 12V
Alternator Capacity ............... 45A to 75A

Fuel System

Injection Pump Type ............... Mechanical rotary distributor pump
Injection Pump Manufacturer ............... Stanadyne or Lucas CAV system
Governor Control Type ............... Mechanical centrifugal flyweight
Fuel Injection Timing ............... Static timed via engine gear indexing pin alignment
Fuel Transfer Pump Type ............... Mechanical diaphragm lift pump
Fuel Transfer Pump Pressure ............... 4.0-7.0 psi (27.5-48.2 kPa)
Fuel Injection Nozzle Type ............... Multi-hole opening mechanical nozzle
Fuel Injection Opening Pressure ............... 3100-3300 psi (21370-22750 kPa)
Fuel Filter Type ............... Primary spin-on water separator with cartridge
Fuel Tank Return Volume ............... High flow path return for thermal stabilization
Recommended Fuel Grade ............... Ultra-low sulfur diesel 2-D premium grade
Maximum Fuel Inlet Restriction ............... 6.0 in Hg (152.4 mm Hg) maximum loss
Maximum Fuel Return Restriction ............... 20.0 in Hg (508.0 mm Hg) system boundary
Injection Pump Drive Gear ............... Helical spur gear locked to camshaft gear mesh
Cold Start Aid Type ............... Intake air glow plugs or ether injection port orifice

Dimensions and Weight

Overall Length, in (mm) ............... 27.2 (690)
Overall Width, in (mm) ............... 22.4 (570)
Overall Height, in (mm) ............... 33.1 (840)
Dry Weight, lbs (kg) ............... 685 (311)
Wet Weight, lbs (kg) ............... 730 (331)

Maintenance Data

Service Information

Cylinder Compression Pressure, psi (bar) ............... 355-430 (24.5-29.5)
Oil Pressure at Rated Speed, psi (kPa) ............... 50-65 (345-448)
Oil Pressure at Low Idle, psi (kPa) ............... 15 (103)
Maximum Allowable Oil Temperature ............... 240 F (115 C)
Coolant Thermostat Opening Initial ............... 180 F (82 C)
Coolant Thermostat Fully Open ............... 202 F (94 C)
Maximum Allowable Coolant Temperature ............... 212 F (100 C)
Intake Valve Clearance (Cold), in (mm) ............... 0.014 (0.356)
Exhaust Valve Clearance (Cold), in (mm) ............... 0.018 (0.457)

Engine Oil and Coolant

Engine Oil Type .................. SAE 10W-30, SAE 15W-40, or JD Plus-50
API Service Classifications ......................... CF-4 or CG-4
Engine Oil Capacity with Filter, qt (L) ............... 9.5 (9.0)
Engine Oil Capacity without Filter, qt (L) ............... 8.5 (8.0)
Cooling System Fluid Capacity, gal (L) ............... 1.8 (7.0)

Service Intervals

Change oil and filter ............... Every 250 hours
Inspect air cleaner ............... Every 250 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 Liner Bore Inside Diameter, in (mm) ............... 4.1929-4.1941 (106.500-106.530)
Cylinder Liner Wear Out-of-Round ............... 0.0020 (0.051)
Cylinder Liner Protrusion Above Block ............... 0.001-0.004 (0.025-0.102)
Main Crankshaft Journal Diameter ............... 3.1230-3.1240 (79.324-79.350)
Main Bearing to Journal Clearance ............... 0.0016-0.0037 (0.041-0.094)
Connecting Rod Journal Diameter ............... 2.7480-2.7490 (69.799-69.825)
Connecting Rod Bearing Clearance ............... 0.0016-0.0035 (0.041-0.089)
Crankshaft End Play ............... 0.002-0.010 (0.051-0.254)
Piston Pin Bore Inside Diameter, in (mm) ............... 1.3748-1.3752 (34.920-34.930)
Piston Pin to Bushing Clearance ............... 0.0005-0.0012 (0.013-0.030)
Top Ring Groove Clearance ............... 0.0035-0.0051 (0.089-0.130)
Second Ring Groove Clearancew ............... 0.0024-0.0040 (0.061-0.102)
Oil Ring Groove Clearance ............... 0.0016-0.0032 (0.041-0.081)
Top Ring End Gap ............... 0.012-0.022 (0.305-0.559)
Second Ring End Gap ............... 0.010-0.020 (0.254-0.508)
Oil Ring End Gap ............... 0.010-0.020 (0.254-0.508)
Cylinder Head Flatness Overall Surface ............... 0.002 (0.051)
Intake Valve Stem Diameter ............... 0.3735-0.3741 (9.487-9.502)
Exhaust Valve Stem Diameter ............... 0.3730-0.3736 (9.474-9.489)
Intake Valve Stem to Guide Clearance ............... 0.0015-0.0031 (0.038-0.079)
Exhaust Valve Stem to Guide Clearance ............... 0.0020-0.0036 (0.051-0.091)
Valve Guide Inside Diameter ............... 0.3756-0.3766 (9.540-9.566)
Valve Seat Angle ............... 45 degrees
Valve Face Angle ............... 44 degrees
Valve Spring Free Length ............... 2.18 in (55.4 mm)
Camshaft Journal Diameter ............... 2.1645-2.1655 (54.978-55.004)
Camshaft Bearing Radial Clearance ............... 0.0015-0.0035 (0.038-0.089)
Camshaft End Play ............... 0.003-0.009 (0.076-0.229)
Cam Lobe Lift (Intake), in (mm) ............... 0.268 (6.81)
Cam Lobe Lift (Exhaust), in (mm) ............... 0.272 (6.91)
Rocker Arm Shaft Outside Diameter ............... 0.7852-0.7862 (19.944-19.969)
Rocker Arm Bushing Bore Inside Diameter ............... 0.7872-0.7882 (19.995-20.020)
Rocker Arm to Shaft Clearance ............... 0.0010-0.0030 (0.025-0.076)

Tightening Torques

Cylinder Head Short Bolts (Step 1) ............... 47 lb-ft (65 Nm)
Cylinder Head Short Bolts (Step 2) ............... 65 lb-ft (88 Nm)
Cylinder Head Short Bolts (Step 3) ............... 95 lb-ft (130 Nm)
Cylinder Head Long Bolts (Step 1) ............... 35 lb-ft (47 Nm)
Cylinder Head Long Bolts (Step 2) ............... 88 lb-ft (120 Nm)
Cylinder Head Long Bolts (Step 3) ............... 110 lb-ft (150 Nm)
Main Bearing Cap Bolts............... 85 lb-ft (115 Nm)
Connecting Rod Cap Black Bolts ............... 52 lb-ft (70 Nm)
Connecting Rod Cap Silver Bolts ............... 63 lb-ft (85 Nm)
Flywheel to Crankshaft Fasteners ............... 85 lb-ft (115 Nm)
Crankshaft Vibration Damper Pulley Bolt ............... 150 lb-ft (204 Nm)
Camshaft Thrust Plate Retaining Bolts ............... 15 lb-ft (20 Nm)
Camshaft Timing Helical Gear Drive Bolt ............... 60 lb-ft (81 Nm)
Timing Gear Cover Housing to Block Screws ............... 18 lb-ft (24 Nm)
Rocker Arm Shaft Support Brackets Fasteners ............... 27 lb-ft (37 Nm)
Valve Cover Valve Train Top Cap Screws ............... 7 lb-ft (10 Nm)
Oil Pan Sump Lower Perimeter Bolts ............... 18 lb-ft (24 Nm)
Oil Pan Central Sump Drain Plug Screw ............... 35 lb-ft (47 Nm)
Injection Pump Drive Gear Mounting Nut ............... 45 lb-ft (61 Nm)
Fuel Injection Nozzle Clamping Stud Nuts ............... 20 lb-ft (27 Nm)
High Pressure Fuel Injection Delivery Line Nuts ............... 20 lb-ft (27 Nm)
Fuel Transfer Diaphragm Lift Pump Fasteners ............... 15 lb-ft (20 Nm)
Exhaust Manifold Structural Flange Stud Nuts ............... 26 lb-ft (35 Nm)
Intake Manifold Air Induction Flange Screws ............... 18 lb-ft (24 Nm)
Water Pump Centrifugal Body to Block Fasteners ............... 18 lb-ft (24 Nm)
Coolant Thermostat Housing Cap Screws ............... 18 lb-ft (24 Nm)
Alternator Pivot Main Support Bolt ............... 35 lb-ft (47 Nm)
Alternator Tensioning Bracer Adjustable Screw ............... 18 lb-ft (24 Nm)
Electric Starter Motor Mounting Fasteners ............... 35 lb-ft (47 Nm)
Oil Pressure Sensor Sending Switch ............... 10 lb-ft (14 Nm)
Coolant Temperature Sensor Housing Switch ............... 15 lb-ft (20 Nm)
Flywheel Housing Outer Core Frame Screws ............... 35 lb-ft (47 Nm)
Oil Cooler Element Header Assembly Nut ............... 22 lb-ft (30 Nm)
Crankcase Breather Vent Tube Flange Screw ............... 7 lb-ft (10 Nm)
Fan Drive Pulley Assembly Hub Shaft Nuts ............... 27 lb-ft (37 Nm)

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