Caterpillar G3406 Engine – Specifications

(Natural Gas Industrial Engine)

General

• Manufacturer: Caterpillar

• Engine Model: G3406

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

• Fuel Type: Natural Gas (pipeline or field gas with proper conditioning)

• Aspiration: Turbocharged & aftercooled

• Application: Industrial / oilfield / pump & compressor drive

• Duty Rating: Continuous / prime duty

Performance (Typical Industrial Ratings)

(Exact rating depends on arrangement, governor, and speed)

• Rated Power: 300 – 400 HP

• Rated Speed: 1,200 – 1,800 RPM

• Peak Torque: ~1,200 – 1,400 lb-ft

• Torque Rise: ~25–30%

Common Ratings

• 330 HP @ 1,200 RPM

• 360 HP @ 1,800 RPM

• 400 HP @ 1,800 RPM (high-output configurations)

Engine Specifications

• Configuration: Inline 6

• Displacement: 893 in³ (14.6 L)

• Bore: 5.4 in (137 mm)

• Stroke: 6.5 in (165 mm)

• Compression Ratio: ~10.0:1 (gas)

• Firing Order: 1-5-3-6-2-4

• Rotation: Counterclockwise (flywheel end, typical)

Fuel & Ignition

• Fuel System: Carbureted natural gas

• Ignition: Magneto or electronic ignition

• Governor: Mechanical or electronic (Woodward common)

Cooling & Lubrication

• Cooling: Jacket water cooled

• Lubrication: Full-pressure system

• Oil Capacity: ~10 – 11 gallons

• Oil Filtration: Full-flow replaceable filters