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CAT 3306 Complete Diesel Engine for Construction Excavator

Basic Properties
Place of Origin: Guangdong, China
Brand Name: CAT
Certification: Available Upon Request
Model Number: CAT 3306
Trading Properties
Minimum Order Quantity: 1 Piece
Price: Price Negotiable
Payment Terms: L/C,D/A,D/P,T/T
Product Summary
CAT 3306 Engine Product Description The CAT 3306 Engine is one of the most reliable and durable heavy-duty diesel engines ever produced by CAT. Known for its simple mechanical structure, outstanding durability, and long service life, the CAT 3306 has become a legendary power solution in the ...

Product Details

Engine Model: CAT 3306
Engine Type: Inline 6 Cylinder Diesel Engine
Displacement: 10.5L / 638 Cu In
Bore X Stroke: 4.75" × 6.00"
Aspiration: Turbocharged / Naturally Aspirated
Horsepower: 230–350 HP
Torque: 585 Lb-ft+
Fuel Type: Diesel
Injection Type: Direct Injection
Compression Ratio: 15.0:1 – 17.5:1
Cooling System: Water Cooled
Valve Train: OHV, 2 Valves Per Cylinder
Oil Capacity: 10.25 Gallons
Engine Weight: 2265 Lbs
Application: Excavator
Condition: New / Rebuilt / Used
Warranty: 6 Months
Origin: China
Brand: Cat
Packaging: Wooden Case
Product Description
CAT 3306 Engine Product Description

The CAT 3306 Engine is one of the most reliable and durable heavy-duty diesel engines ever produced by CAT. Known for its simple mechanical structure, outstanding durability, and long service life, the CAT 3306 has become a legendary power solution in the construction, industrial, marine, and transportation industries worldwide.

Introduced in the early 1970s, the CAT 3306 was designed to replace older CAT engine platforms and quickly earned a strong reputation for dependable performance under extreme working conditions. The engine remained in production for more than 25 years and continues to be widely used around the world today.

Built with an inline 6-cylinder configuration and 10.5L displacement, the CAT 3306 delivers powerful low-end torque, excellent fuel economy, and easy maintenance. Available in naturally aspirated, turbocharged, and aftercooled configurations, the engine is suitable for a wide variety of heavy-duty equipment and industrial applications.

Modern upgraded CAT 3306 engines equipped with turbochargers and injector enhancements can produce over 1000 lb-ft of torque and up to 360 horsepower, making the engine an ideal choice for demanding operations requiring reliable and continuous power output.

The CAT 3306 is especially valued for its rugged cast iron engine block, wet cylinder liners, mechanical fuel system, and highly durable direct injection design. Compared with more complicated modern electronic engines, the 3306 remains easier to repair, maintain, and rebuild, helping reduce downtime and operating costs.

Key Features
  • Proven inline 6-cylinder heavy-duty diesel engine
  • 10.5L displacement with exceptional torque output
  • Durable cast iron engine block and cylinder head
  • Direct injection fuel system for improved fuel efficiency
  • Available in naturally aspirated, turbocharged, and aftercooled versions
  • Easy maintenance and rebuild-friendly design
  • Excellent reliability in harsh working environments
  • Long operational lifespan with low maintenance costs
  • Widely used in construction, industrial, marine, and generator applications
Applications

The CAT 3306 engine is widely used in:

  • Excavators
  • Bulldozers
  • Motor Graders
  • Wheel Loaders
  • Dump Trucks
  • Rollers and Scrapers
  • Generator Sets
  • Industrial Pumps
  • Cement Mixers
  • Vocational Trucks
  • Delivery Vehicles
  • Marine Boats and Ferries
  • Fireboats and Trawlers

Popular equipment applications include CAT D6 and D7 dozers, 12G/14G/140G motor graders, CAT 225 excavators, and various industrial and marine power systems.

CAT 3306 Specifications
Item Specification
Engine Model CAT 3306
Engine Type Inline 6-Cylinder Diesel Engine
Displacement 10.5L (638 cu in)
Bore x Stroke 4.75" * 6.00"
Aspiration Naturally Aspirated / Turbocharged / Aftercooled
Compression Ratio 15.0:1 – 17.5:1
Horsepower 230 – 350 HP
Torque 585 lb-ft+
Fuel System Direct Injection / Mechanical Injection
Injection Pump Scroll-Type Mechanical Injection Pump
Valve Train OHV, 2 Valves per Cylinder
Firing Order 1-5-3-6-4-2
Cooling System Water Cooled
Engine Block Cast Iron with Wet Cylinder Liners
Cylinder Head Cast Iron
Oil Capacity 10.25 Gallons
Governor Hydramechanical or Woodward PSG
Dry Weight Approx. 2265 lbs
Reliable Performance and Long Service Life

The CAT 3306 engine is famous for its unmatched reliability and simple mechanical design. Earlier versions utilized indirect injection with precombustion chambers, while later direct injection models significantly improved fuel efficiency and performance. The mechanical injection system is highly dependable and easier to service compared to modern electronically controlled engines.

Thanks to its strong low-speed torque characteristics, the CAT 3306 performs exceptionally well in heavy-load applications such as earthmoving, industrial pumping, marine propulsion, and power generation.

Even decades after production ended, the CAT 3306 remains one of the most trusted diesel engines in the global heavy equipment market due to its durability, parts availability, rebuildability, and proven field performance.

Why Choose the CAT 3306 Engine?
  • Legendary CAT reliability
  • Strong heavy-duty torque output
  • Easy repair and maintenance
  • Excellent parts availability worldwide
  • Proven performance in construction and marine industries
  • Long engine lifespan with rebuild capability
  • Suitable for industrial, generator, and equipment applications

The CAT 3306 continues to be a preferred choice for customers seeking a dependable, rebuildable, and cost-effective heavy-duty diesel engine solution for demanding environments worldwide.

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