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Ford 2704ET Engine

The Ford 2704ET is a heavy-duty, 6-cylinder, turbocharged industrial and marine diesel engine belonging to the prominent Ford 2700 "Dorset" range. Designed for continuous high-torque output, this overhead-valve power plant is commonly utilized in agricultural machinery, such as New Holland combine harvesters, as well as heavy industrial tractors and marine conversions. It is highly regarded in workshop environments for its robust cast-iron construction, conventional mechanical systems, and ease of serviceability.

The engine utilizes an overhead valve (OHV) configuration with 2 valves per cylinder (12 valves total), driven by a single gear-driven camshaft located in the cylinder block via pushrods and rocker arms. Valve clearance adjustments must be performed mechanically at the rocker shaft adjustment screws according to standard workshop manual service intervals. Bore: 105 mm (4.125 inches). Stroke: 115 mm (4.524 inches). Total Displacement: 5.945 liters (362.8 cubic inches).

The fuel system relies on a traditional mechanical direct-injection layout. Fuel is drawn from the storage tank by a mechanical lift pump through a primary and secondary fuel filter assembly to eliminate water and contaminants. It is then fed into a high-pressure mechanical fuel injection pump (typically a Minimec or Bosch inline injection pump), which is gear-driven from the timing train. The injection pump timed pulses deliver highly pressurized fuel directly to individual multi-hole mechanical injectors threading into the top of the cylinder head combustion chambers. Excess fuel from the injectors and pump is routed back to the fuel tank via a low-pressure return line.

Lubrication is managed via a pressure-fed system driven by a high-capacity, gear-driven oil pump mounted internally to the cylinder block. Oil is drawn from the deep-sump oil pan through a pickup strainer and routed directly through a full-flow, spin-on oil filter assembly. Channels cast into the block feed pressurized oil to the main bearings, connecting rod journals, camshaft bearings, and up to the overhead rocker assembly.

The engine uses a forced liquid-cooled system governed by a centrifugal, belt-driven water pump. Coolant circulation flows from the radiator or marine heat exchanger through the cylinder block jackets and up into the cylinder head to maintain optimal thermal stability under load. Temperature levels are regulated by a mechanical wax-element thermostat restricting or granting flow back to the cooling matrix based on operational temperatures.

General Technical Data

Engine Specifications

Engine Model ............... Ford 2704ET
Engine Type ............... 4-cycle 6-cylinder turbocharged direct injection liquid-cooled diesel
Number of Cylinders ............... 6
Cylinder Arrangement ............... In-line
Engine Bore, in (mm) ............... 4.125 (105.0)
Engine Stroke, in (mm) ............... 4.524 (115.0)
Displacement, cu.in (L) ............... 362.8 (5.95)
Rated Engine Power, hp (kW) ............... 150-180 (111-134)
Rated Engine Speed, rpm ............... 2400-2450
Peak Torque ............... 350-400 lb-ft (475-542 Nm) at 1600-1800 rpm
Idle Speed ............... 650-700 rpm
Max No-Load Speed, rpm ............... 2650-2700
Aspiration Type ............... Turbocharged
Turbocharger Model ............... BorgWarner 3LD
Compression Ratio ............... 14.7:1-15.5:1
Firing Order ............... 1-5-3-6-2-4
Cylinder Block Type ............... Cast iron with dry liners
Cylinder Head Type ............... Cast iron single piece
Lubrication System ............... Full-pressure wet sump
Oil Pump Type ............... Gear-driven
Oil Filter Type ............... Full-flow spin-on
Cooling System ............... Liquid-cooled with heat exchanger
Water Pump Type ............... Belt-driven centrifugal
Air Cleaner Type ............... Dry element or washable mesh
Starting System ............... Electric starter motor
Electrical System ............... 12V or 24V

Fuel System

Fuel Injection Pump Type ............... Minimec inline mechanical or Simms
Governor Type ............... Mechanical centrifugal or hydraulic
Fuel Injection Timing ............... 23-26 deg BTDC
Fuel Injector Type ............... Multi-hole nozzle mechanical
Injector Opening Pressure, psi (bar) ............... 2900-3050 (200-210)
Fuel Lift Pump Type ............... Mechanical plunger type
Fuel Lift Pump Pressure, psi (bar) ............... 5-8 (0.34-0.55)
Fuel Filter Type ............... Dual element cartridge with water separator
Maximum Fuel Return Flow, gal/hr (L/hr) ............... 12.0 (45.4)
Fuel Consumption Rate, lb/hp-hr (g/kW-hr) ............... 0.380 (231)
Fuel Injection Piping Type ............... High-pressure seamless steel
Maximum Supply Line Restriction, inHg (mmHg) ............... 4.0 (101.6)
Maximum Return Line Restriction, inHg (mmHg) ............... 6.0 (152.4)

Dimensions and Weight

Overall Length, in (mm) ............... 47.2 (1200)
Overall Width, in (mm) ............... 31.5 (800)
Overall Height, in (mm) ............... 47.2 (1200)
Dry Weight, lbs (kg) ............... 1102 (500)
Wet Weight, lbs (kg) ............... 1190 (540)

Maintenance Data

Service Information

Compression Pressure, psi (bar) ............... 380-420 (26.2-29.0)
Engine Oil Pressure at Rated Speed, psi (bar) ............... 40-60 (2.7-4.1)
Engine Oil Pressure at Idle Speed, psi (bar) ............... 15 (1.0)
Maximum Engine Oil Temperature, F (C) ............... 230 (110)
Thermostat Opening Temperature, F (C) ............... 172 (78)
Thermostat Fully Open Temperature, F (C) ............... 197 (92)
V-Belt Tension Deflection, in (mm) ............... 0.39-0.51 (10.0-13.0)
Intake Valve Clearance, Cold, in (mm) ............... 0.012 (0.30)
Exhaust Valve Clearance, Cold, in (mm) ............... 0.015 (0.38)

Engine Oil and Coolant

Engine Oil Type .................. SAE 30, SAE 15W-40
API Service Classifications ......................... CD or CE
Engine Oil Capacity with Filter, qt (L) ............... 15.8 (15.0)
Engine Oil Capacity Sump Only, qt (L) ............... 13.7 (13.0)
Cooling System Fluid Capacity, qt (L) ............... 23.2 (22.0)

Service Intervals

Change oil and filter ............... Every 150 hours
Inspect air cleaner ............... Every 50 hours
Replace air cleaner ............... Every 600 hours
Replace fuel filter ............... Every 300 hours
Valve clearance adjustment ............... Every 600 hours
Fuel system inspection ............... Every 600 hours
Change coolant ............... Every 1000 hours
Compression test ............... Every 600 hours
Belt inspection ............... Every service cycle

Service Specifications

Cylinder Bore Standard Diameter, in (mm) ............... 4.1251-4.1260 (104.778-104.800)
Cylinder Bore Maximum Wear Limit, in (mm) ............... 4.1310 (104.927)
Cylinder Liner Out-of-Round Limit, in (mm) ............... 0.0010 (0.025)
Cylinder Liner Taper Limit, in (mm) ............... 0.0015 (0.038)
Cylinder Block Deck Flatness Limit, in (mm) ............... 0.004 (0.102)
Connecting Rod Big End Bore Diameter, in (mm) ............... 2.6450-2.6455 (67.183-67.196)
Connecting Rod Bearing Oil Clearance, in (mm) ............... 0.0018-0.0038 (0.046-0.097)
Crankshaft Main Journal Standard Diameter, in (mm) ............... 3.2490-3.2500 (82.525-82.550)
Crankshaft Main Journal Wear Limit, in (mm) ............... 3.2450 (82.423)
Crankshaft Crankpin Standard Diameter, in (mm) ............... 2.4990-2.5000 (63.475-63.500)
Crankshaft Crankpin Wear Limit, in (mm) ............... 2.4950 (63.373)
Crankshaft End Play, in (mm) ............... 0.004-0.012 (0.10-0.30)
Main Bearing Oil Clearance, in (mm) ............... 0.0022-0.0042 (0.056-0.107)
Piston Skirt Standard Diameter, in (mm) ............... 4.1195-4.1205 (104.635-104.661)
Piston to Cylinder Liner Clearance, in (mm) ............... 0.0045-0.0065 (0.114-0.165)
Piston Pin Journal Diameter, in (mm) ............... 1.4373-1.4375 (36.507-36.512)
Piston Pin to Con Rod Bushing Clearance, in (mm) ............... 0.0006-0.0012 (0.015-0.030)
Top Ring Groove Side Clearance, in (mm) ............... 0.0030-0.0045 (0.076-0.114)
Second Ring Groove Side Clearance, in (mm) ............... 0.0020-0.0035 (0.051-0.089)
Oil Ring Groove Side Clearance, in (mm) ............... 0.0015-0.0030 (0.038-0.076)
Top Ring End Gap, in (mm) ............... 0.014-0.024 (0.35-0.61)
Second Ring End Gap, in (mm) ............... 0.012-0.022 (0.30-0.56)
Oil Ring End Gap, in (mm) ............... 0.010-0.020 (0.25-0.51)
Cylinder Head Flatness Limit, in (mm) ............... 0.003 (0.076)
Intake Valve Stem Diameter, in (mm) ............... 0.3725-0.3735 (9.461-9.487)
Exhaust Valve Stem Diameter, in (mm) ............... 0.3715-0.3725 (9.436-9.461)
Intake Valve Guide Inside Diameter, in (mm) ............... 0.3745-0.3755 (9.512-9.538)
Exhaust Valve Guide Inside Diameter, in (mm) ............... 0.3745-0.3755 (9.512-9.538)
Intake Valve Stem to Guide Clearance, in (mm) ............... 0.0010-0.0030 (0.025-0.076)
Exhaust Valve Stem to Guide Clearance, in (mm) ............... 0.0020-0.0040 (0.051-0.102)
Valve Face Angle, degrees ............... 45
Valve Seat Angle, degrees ............... 45
Valve Spring Free Length, in (mm) ............... 2.12 (53.8)
Camshaft Journal Standard Diameter, in (mm) ............... 2.1230-2.1240 (53.924-53.950)
Camshaft Bearing Oil Clearance, in (mm) ............... 0.0015-0.0035 (0.038-0.089)
Camshaft End Play, in (mm) ............... 0.003-0.007 (0.08-0.18)
Cam Lobe Lift (Intake), in (mm) ............... 0.285 (7.24)
Cam Lobe Lift (Exhaust), in (mm) ............... 0.285 (7.24)

Tightening Torques

Cylinder Head Bolts (Stage 1), lb-ft (Nm) ............... 40 (54)
Cylinder Head Bolts (Stage 2), lb-ft (Nm) ............... 75 (102)
Cylinder Head Bolts (Stage 3), lb-ft (Nm) ............... 110 (149)
Main Bearing Cap Bolts, lb-ft (Nm) ............... 115 (156)
Connecting Rod Cap Nuts, lb-ft (Nm) ............... 60 (81)
Flywheel Retaining Bolts, lb-ft (Nm) ............... 85 (115)
Flywheel Housing Bolts, lb-ft (Nm) ............... 35 (47)
Crankshaft Damper Pulley Bolt, lb-ft (Nm) ............... 150 (203)
Camshaft Thrust Plate Bolts, lb-ft (Nm) ............... 18 (24)
Camshaft Gear Bolt, lb-ft (Nm) ............... 45 (61)
Rocker Arm Shaft Bracket Bolts, lb-ft (Nm) ............... 30 (41)
Cylinder Head Cover Screws, lb-ft (Nm) ............... 8 (11)
Oil Pan Drain Plug, lb-ft (Nm) ............... 35 (47)
Oil Pan Retaining Bolts, lb-ft (Nm) ............... 15 (20)
Oil Pump Retaining Bolts, lb-ft (Nm) ............... 18 (24)
Fuel Injection Pump Drive Gear Nut, lb-ft (Nm) ............... 45 (61)
Fuel Injection Pump Mounting Bolts, lb-ft (Nm) ............... 18 (24)
Fuel Injector Retaining Clamp Bolts, lb-ft (Nm) ............... 15 (20)
High Pressure Fuel Line Nuts, lb-ft (Nm) ............... 20 (27)
Intake Manifold Bolts, lb-ft (Nm) ............... 22 (30)
Exhaust Manifold Bolts, lb-ft (Nm) ............... 25 (34)
Turbocharger Mounting Nuts, lb-ft (Nm) ............... 35 (47)
Water Pump Mounting Bolts, lb-ft (Nm) ............... 18 (24)
Thermostat Housing Bolts, lb-ft (Nm) ............... 15 (20)
Starter Motor Mounting Bolts, lb-ft (Nm) ............... 45 (61)
Alternator Mounting Bracket Bolts, lb-ft (Nm) ............... 35 (47)
Oil Filter Adaptor Bolts, lb-ft (Nm) ............... 22 (30)
Glow Plugs or Air Heater Plug, lb-ft (Nm) ............... 20 (27)
Front Timing Cover Bolts, lb-ft (Nm) ............... 15 (20)
Rear Oil Seal Carrier Bolts, lb-ft (Nm) ............... 15 (20)

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• Ford Engines Specs
  
• Ford 2701E Specs
  
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• Ford 2704E Specs
  
• Ford 2709E Specs
  

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