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Ford CSG-637 Engine

The Ford CSG-637 is an industrial, heavy-duty 3.7-liter, 60-degree V-6 powertrain assembly produced by Ford Power Products. Derived from the automotive Cyclone/Duratec V6 engine family, this naturally aspirated engine is engineered specifically for stationary and industrial applications, including generators, pumps, and power floats. It features a lightweight, high-strength aluminum cylinder block and aluminum cylinder heads. The engine is designed for multi-fuel flexibility and is certified to operate on gasoline, liquified petroleum gas (LPG), or natural gas (NG). It features electronic engine management with comprehensive diagnostic support via a Global Control Platform (GCP) or 4G engine control module.

The valvetrain utilizes a Dual Overhead Camshaft (DOHC) architecture with four valves per cylinder (24 valves total). The camshafts are chain-driven and incorporate a Twin Independent Variable Cam Timing (Ti-VCT) system to continuously optimize valve timing across the RPM range. The valvetrain utilizes direct-acting mechanical buckets with highly polished contact surfaces to reduce friction and eliminate the need for routine manual valve adjustments ("set-for-life" valvetrain). The total engine displacement is 3.7 liters (3726 cc / 225.7 cu.in). The cylinder bore measures 95.5 mm (3.76 inches) and the piston stroke measures 86.7 mm (3.41 inches). The engine operates at a static compression ratio of 10.5:1.

The fuel delivery system is electronically managed and adaptable to multiple fuel types. For gasoline operation, the system utilizes sequential multi-port electronic fuel injection (SMPFI) with injectors located in the lower intake manifold assembly. Gaseous fuel configurations (LPG and Natural Gas) integrate an electronic gas shut-off valve, an integrated fuel filter, a gas-mix regulator/vaporizer, and an electronic Bosch throttle body to manage fuel metering and air intake. Air-fuel ratios are strictly maintained via an integrated closed-loop lambda control system utilizing an exhaust oxygen sensor to monitor combustion efficiency.

The lubrication system is a full-pressure, wet-sump configuration. A positive-displacement oil pump, driven directly by the forged steel crankshaft, circulates oil through an internal gallery network to the main bearings, connecting rods, and overhead valvetrain assembly. The engine uses a pressurized, closed-loop, liquid-cooling system designed to regulate thermal cycles under continuous industrial loads. Coolant circulation is maintained by a belt-driven centrifugal water pump driven by a poly-V accessory drive belt. The cooling circuit includes an engine-mounted thermostat to control flow to the radiator and can accommodate either an engine-driven suction fan or pusher fan depending on the industrial application layout.

General Technical Data

Engine Specifications

Engine Model ............... Ford CSG-637
Engine Config Name ............... Duratec 37 Industrial Platform Variant
Engine Type ............... 4-cycle 60-deg V-block 6-cylinder spark-ignited liquid-cooled
Number of Cylinders ............... 6
Cylinder Arrangement ............... V-type
Engine Bore, in (mm) ............... 3.76 (95.5)
Engine Stroke, in (mm) ............... 3.41 (86.7)
Displacement, cu.in (L) ............... 227.4 (3.726)
Rated Power (Gas), hp (kW) ............... 300-305 (224-227) at 6500 rpm
Rated Power (LPG), hp (kW) ............... 265-275 (197-205) at 6000 rpm
Rated Power (NG), hp (kW) ............... 250-260 (186-194) at 6000 rpm
Peak Torque (Gas) ............... 280 lb-ft (380 Nm) at 4000-4250 rpm
Peak Torque (LPG) ............... 255 lb-ft (346 Nm) at 4000 rpm
Peak Torque (NG) ............... 240 lb-ft (325 Nm) at 4000 rpm
Base Idle Speed ............... 650-750 rpm
Max Governed Speed ............... 4250-6500 rpm
Compression Ratio ............... 10.5:1
Firing Order ............... 1-4-2-5-3-6
Cylinder Block Material ............... Cast aluminum alloy
Cylinder Head Material ............... Cast aluminum alloy
Valvetrain Configuration ............... Dual Overhead Camshaft DOHC 24-valve
Variable Valve Timing ............... Twin Independent Variable Cam Timing Ti-VCT
Lubrication System ............... Full-pressure feed dry sump or deep wet sump
Oil Pump Type ............... Crankshaft-driven rotor type
Oil Filter Type ............... Full-flow, spin-on cartridge
Cooling System ............... Forced liquid circulation
Water Pump Type ............... Timing chain-driven internal centrifugal
Air Cleaner Type ............... Dry heavy-duty industrial element
Ignition System ............... Electronic distributorless coil-on-plug COP system
Spark Plug Type ............... Platinum-tipped high-durability
Starting System ............... Electric starter motor
Electrical System ............... 12V negative ground
Alternator Rating ............... 150 A

Fuel System

Fuel Injection Type ............... Electronic Sequential Multi-Port Fuel Injection (SMPFI)
Gasoline Fuel Pressure, psi (kPa) ............... 55.0-65.0 (379.2-448.1)
Gaseous Fuel Pressure (LPG Inlet), psi (kPa) ............... 11.0-14.0 (75.8-96.5)
Gaseous Fuel Pressure (NG Inlet), psi (kPa) ............... 7.0-11.0 (48.2-75.8)
Throttle Body Diameter, in (mm) ............... 2.68 (68.0)
Throttle Control Type ............... Electronic Drive-By-Wire throttle system
Oxygen Sensor Type ............... Heated zirconia switching sensors
LPG Vaporizer Type ............... Engine coolant-heated dual-stage pressure regulator
NG Regulator Type ............... Single or dual-stage industrial gas pressure regulator
Fuel Shut-off Valve Type ............... 12V direct-acting electronic solenoid valve
Maximum Fuel Flow Rate, lb/hr (kg/hr) ............... 95.0 (43.1)

Dimensions and Weight

Overall Length, in (mm) ............... 28.5 (725)
Overall Width, in (mm) ............... 27.2 (690)
Overall Height, in (mm) ............... 31.1 (790)
Dry Weight, lbs (kg) ............... 365 (166)

Maintenance Data

Service Information

Compression Pressure Range, psi (kPa) ............... 165.0-185.0 (1137.6-1275.5)
Maximum Cylinder Pressure Variance, psi (kPa) ............... 15.0 (103.4)
Oil Pressure at Idle, psi (kPa) ............... 15.0 (103.4)
Normal Operating Oil Pressure, psi (kPa) ............... 30.0-60.0 (206.8-413.7)
Oil Pressure Relief Valve Setting, psi (kPa) ............... 75.0 (517.1)
Thermostat Opening Temperature, F (C) ............... 180.0 (82.2)
Thermostat Fully Open Temperature, F (C) ............... 202.0 (94.4)
Spark Plug Gap, in (mm) ............... 0.049-0.053 (1.25-1.35)
Intake Valve Lash, Cold, in (mm) ............... 0.007-0.011 (0.180-0.280)
Exhaust Valve Lash, Cold, in (mm) ............... 0.011-0.015 (0.280-0.380)

Engine Oil and Coolant

Engine Oil Type .................. SAE 5W-20, 5W-30, SAE 10W-30
API Service Classifications ......................... SM
Engine Oil Capacity with Filter, qt (L) ............... 6.0 (5.7)
Engine Oil Capacity without Filter, qt (L) ............... 5.5 (5.2)
Engine Coolant Capacity (Engine only), qt (L) ............... 4.8 (4.5)

Service Intervals

Change oil and filter ............... Every 250 hours
Service air filter ............... Every 500 hours
Replace air filter ............... Every 1000 hours
Replace fuel filter ............... Every 500 hours
Fuel system inspection ............... Every 1000 hours
Replace spark plug ............... Every 1000 hours
Change coolant ............... Every 2000 hours
Compression test ............... Every 1000 hours
Belt inspection ............... Every service cycle

Service Specifications

Cylinder Bore Diameter (Grade A), in (mm) ............... 3.7598-3.7602 (95.500-95.510)
Cylinder Bore Diameter (Grade B), in (mm) ............... 3.7602-3.7606 (95.510-95.520)
Cylinder Bore Diameter (Grade C), in (mm) ............... 3.7606-3.7610 (95.520-95.530)
Cylinder Bore Out-of-Round, in (mm) ............... 0.0003 (0.008)
Cylinder Bore Taper Limit, in (mm) ............... 0.0003 (0.008)
Main Bearing Journal Diameter, in (mm) ............... 2.677 (68.0)
Connecting Rod Journal Diameter, in (mm) ............... 2.204 (56.0)
Crankshaft End Play, in (mm) ............... 0.003-0.009 (0.076-0.229)
Crankshaft Main Bearing Clearance, in (mm) ............... 0.0007-0.0017 (0.018-0.043)
Connecting Rod Bearing Clearance, in (mm) ............... 0.0011-0.0020 (0.028-0.051)
Connecting Rod Side Play, in (mm) ............... 0.004-0.013 (0.100-0.330)
Connecting Rod Bore Big End Diameter, in (mm) ............... 2.3224-2.3232 (58.990-59.010)
Connecting Rod Bore Small End Diameter, in (mm) ............... 0.8665-0.8671 (22.010-22.025)
Piston Outside Diameter (Grade A), in (mm) ............... 3.7587-3.7591 (95.470-95.480)
Piston Outside Diameter (Grade B), in (mm) ............... 3.7591-3.7594 (95.480-95.490)
Piston Outside Diameter (Grade C), in (mm) ............... 3.7594-3.7598 (95.490-95.500)
Piston Pin Diameter, in (mm) ............... 0.866 (22.0)
Piston-to-Bore Clearance, in (mm) ............... 0.0008-0.0018 (0.020-0.046)
Piston Pin-to-Con Rod Bushing Clearance, in (mm) ............... 0.0003-0.0007 (0.008-0.018)
Piston Pin-to-Piston Boss Bore Clearance, in (mm) ............... 0.0002-0.0005 (0.005-0.013)
Top Ring Groove Width, in (mm) ............... 0.048-0.049 (1.210-1.230)
Second Ring Groove Width, in (mm) ............... 0.048-0.049 (1.210-1.230)
Oil Ring Groove Width, in (mm) ............... 0.079-0.080 (2.010-2.030)
Top Ring Thickness, in (mm) ............... 0.046-0.047 (1.170-1.190)
Second Ring Thickness, in (mm) ............... 0.046-0.047 (1.170-1.190)
Oil Ring Thickness, in (mm) ............... 0.074-0.076 (1.880-1.920)
Top Ring Side Clearance, in (mm) ............... 0.0012-0.0031 (0.030-0.080)
Second Ring Side Clearance, in (mm) ............... 0.0012-0.0031 (0.030-0.080)
Oil Ring Side Clearance, in (mm) ............... 0.0006-0.0035 (0.015-0.090)
Top Ring End Gap, in (mm) ............... 0.006-0.012 (0.150-0.300)
Second Ring End Gap, in (mm) ............... 0.012-0.022 (0.300-0.550)
Oil Ring End Gap, in (mm) ............... 0.006-0.021 (0.150-0.540)
Cylinder Head Flatness, Limit, in (mm) ............... 0.002 (0.050)
Cylinder Block Flatness, Limit, in (mm) ............... 0.003 (0.076)
Valve Head Diameter (Intake), in (mm) ............... 1.456 (37.0)
Valve Head Diameter (Exhaust), in (mm) ............... 1.220 (31.0)
Valve Stem Diameter (Intake), in (mm) ............... 0.216 (5.5)
Valve Stem Diameter (Exhaust), in (mm) ............... 0.215 (5.46)
Valve Stem-to-Guide Clearance (Intake), in (mm) ............... 0.0008-0.0027 (0.020-0.069)
Valve Stem-to-Guide Clearance (Exhaust), in (mm) ............... 0.0015-0.0031 (0.038-0.078)
Valve Guide Outer Diameter, in (mm) ............... 0.395-0.396 (10.030-10.045)
Valve Guide Bore Diameter, in (mm) ............... 0.393-0.394 (9.975-9.995)
Valve Seat Bore Diameter (Intake), in (mm) ............... 1.516-1.517 (38.500-38.525)
Valve Seat Bore Diameter (Exhaust), in (mm) ............... 1.280-1.281 (32.500-32.525)
Valve Seat Width (Intake), in (mm) ............... 0.039-0.055 (1.000-1.400)
Valve Seat Width (Exhaust), in (mm) ............... 0.039-0.055 (1.000-1.400)
Valve Seat Angle, degrees ............... 45.0
Valve Face Angle, degrees ............... 45.0
Valve Spring Free Length, in (mm) ............... 1.882 (47.8)
Valve Guide Inner Diameter (Intake), in (mm) ............... 0.217-0.219 (5.518-5.556)
Valve Guide Inner Diameter (Exhaust), in (mm) ............... 0.217-0.219 (5.518-5.556)
Valve Guide Installed Height, in (mm) ............... 0.445-0.465 (11.3-11.8)
Camshaft Journal Bore Diameter, in (mm) ............... 1.024-1.025 (26.010-26.040)
Camshaft Journal Diameter, in (mm) ............... 1.022-1.023 (25.960-25.980)
Camshaft Bearing Clearance, in (mm) ............... 0.0009-0.0028 (0.023-0.071)
Camshaft Lobe Lift (Intake), in (mm) ............... 0.372 (9.45)
Camshaft Lobe Lift (Exhaust), in (mm) ............... 0.339 (8.62)
Camshaft End Play, in (mm) ............... 0.001-0.005 (0.025-0.127)

Tightening Torques

Main Bearing Cap Bolts (Step 1) ............... 15 lb-ft (20 Nm)
Main Bearing Cap Bolts (Step 2) ............... 33 lb-ft (45 Nm)
Main Bearing Cap Side Cross-Bolts ............... 22 lb-ft (30 Nm)
Connecting Rod Cap Bolts (Step 1) ............... 18 lb-ft (25 Nm)
Connecting Rod Cap Bolts (Step 2) ............... 33 lb-ft (45 Nm)
Cylinder Head M11 Long Bolts (Step 1) ............... 26 lb-ft (35 Nm)
Cylinder Head M11 Long Bolts (Step 2) ............... 52 lb-ft (70 Nm)
Cylinder Head Small M8 Bolts ............... 18 lb-ft (24 Nm)
Flywheel Mounting Bolts (Step 1) ............... 15 lb-ft (20 Nm)
Flywheel Mounting Bolts (Step 2) ............... 37 lb-ft (50 Nm)
Crankshaft Vibration Damper Pulley Bolt (Step 1) ............... 89 lb-ft (120 Nm)
Crankshaft Vibration Damper Pulley Bolt (Step 2) ............... 37 lb-ft (50 Nm)
Camshaft Bearing Cap Bolts ............... 89 lb-in (10 Nm)
Camshaft Sprocket Actuator Phaser Bolts ............... 30 lb-ft (40 Nm)
Timing Chain Hydraulic Tensioner Bolts ............... 89 lb-in (10 Nm)
Timing Chain Guide Rails Retention Bolts ............... 89 lb-in (10 Nm)
Engine Structural Front Cover M6 Bolts ............... 89 lb-in (10 Nm)
Engine Structural Front Cover M8 Bolts ............... 18 lb-ft (24 Nm)
Engine Structural Front Cover M10 Bolts ............... 35 lb-ft (48 Nm)
Structural Rear Sump Oil Pan M6 Bolts ............... 89 lb-in (10 Nm)
Structural Rear Sump Oil Pan Bolts M8 ............... 18 lb-ft (24 Nm)
Oil Pan Drain Plug Fitting ............... 20 lb-ft (27 Nm)
Spark Plugs Installation Torque ............... 133 lb-in (15 Nm)
Ignition Coil-on-Plug COP Retaining Screws ............... 53 lb-in (6 Nm)
Lower Intake Manifold Retaining Bolts (Step 1) ............... 89 lb-in (10 Nm)
Lower Intake Manifold Retaining Bolts (Step 2) ............... 18 lb-ft (24 Nm)
Upper Intake Manifold Plenum Fasteners ............... 89 lb-in (10 Nm)
Exhaust Manifold to Cylinder Head Nuts (Step 1) ............... 15 lb-ft (20 Nm)
Exhaust Manifold to Cylinder Head Nuts (Step 2) ............... 22 lb-ft (30 Nm)
Water Pump to Block Assembly Bolts ............... 89 lb-in (10 Nm)
Thermostat Housing Assembly Bolts ............... 89 lb-in (10 Nm)
Oil Pump Assembly Retaining Fasteners ............... 89 lb-in (10 Nm)
Oil Pump Screen and Pickup Tube Bolt ............... 89 lb-in (10 Nm)
Oil Pump Screen and Pickup Spacer Nut ............... 18 lb-ft (24 Nm)
Valve Camshaft Valve Cover Fasteners ............... 89 lb-in (10 Nm)
Variable Cam Timing Control Solenoid Bolts ............... 89 lb-in (10 Nm)
Crankshaft Position Sensor Screw ............... 89 lb-in (10 Nm)
Camshaft Position Sensor Screw ............... 89 lb-in (10 Nm)
Engine Coolant Temperature Sensor Fitting ............... 15 lb-ft (20 Nm)
Oil Pressure Indicator Switch Fitting ............... 11 lb-ft (15 Nm)
Knock Sensor Retention Fasteners ............... 18 lb-ft (24 Nm)
Fuel Rail Mounting Bracket Assembly Bolts ............... 89 lb-in (10 Nm)
Electronic Throttle Body Assembly Screws ............... 89 lb-in (10 Nm)
Engine Rear Main Oil Seal Retainer Bolts ............... 89 lb-in (10 Nm)
Alternator Mounting Bracket Support Bolts ............... 35 lb-ft (48 Nm)
Starter Motor Mounting Flange Bolts ............... 35 lb-ft (48 Nm)
Accessory Drive Idler Pulley Bolt ............... 18 lb-ft (24 Nm)
Accessory Drive Belt Hydraulic Tensioner Bolt ............... 35 lb-ft (48 Nm)
Engine Lifting Eye Attachment Fasteners ............... 35 lb-ft (48 Nm)
Engine Front Support Insulator Bracket Bolts ............... 48 lb-ft (65 Nm)
Engine Rear Support Insulator Bracket Bolts ............... 48 lb-ft (65 Nm)
Flywheel Housing Adapter Ring Flange Bolts ............... 35 lb-ft (48 Nm)
Exhaust Pipe Flange Connection Nuts ............... 30 lb-ft (40 Nm)
Air Intake Plenum Tube Hose Clamps ............... 35 lb-in (4 Nm)
LPG Regulator Mounting Chassis Bracket Bolts ............... 18 lb-ft (24 Nm)
Gas Mixer Assembly Retention Stud Nuts ............... 89 lb-in (10 Nm)
Fuel Shutoff Valve Assembly Solenoid Nut ............... 44 lb-in (5 Nm)
Water Pump Pulley Attachment Screws ............... 18 lb-ft (24 Nm)
PCV Valve Threaded Insertion Torque ............... 62 lb-in (7 Nm)

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