Caterpillar G3306 Engine – Rebuilt

(Natural Gas Industrial Engine)

General

• Manufacturer: Caterpillar

• Engine Model: G3306

• Engine Type: Inline 6-cylinder, 4-stroke

• Fuel Type: Natural Gas (field gas capable with proper setup)

• Aspiration: Naturally aspirated or turbocharged (configuration dependent)

• Application: Industrial / oilfield service

• Duty Rating: Continuous

Performance (Typical G3306 Ratings)

(Final output depends on aspiration & governor speed)

• Rated Power: 170 – 230 HP

• Rated Speed: 1,200 – 1,800 RPM

• Peak Torque: ~650 – 750 lb-ft

• Torque Rise: ~25%

Common ratings:

• 185 HP @ 1,200 RPM

• 210 HP @ 1,800 RPM

• 230 HP (turbocharged variants)

Engine Specifications

• Configuration: Inline 6

• Displacement: 638 in³ (10.5 L)

• Bore: 4.75 in (121 mm)

• Stroke: 5.00 in (127 mm)

• Compression Ratio: ~10.5:1 (gas)

• Rotation: Counterclockwise (flywheel end, typical)

Fuel & Ignition

• Fuel System: Carbureted natural gas

• Ignition: Magneto or electronic ignition

• Governor: Mechanical or electronic (Woodward commonly used)

Cooling & Lubrication

• Cooling: Jacket water cooled

• Lubrication: Full pressure

• Oil Capacity: ~7 – 8 gallons

• Oil Filtration: Full-flow spin-on filters