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CAT 3306 Complete Diesel Engine for Construction Excavator

Categories Excavator Engine
Brand Name: CAT
Model Number: CAT 3306
Certification: Available Upon Request
Place of Origin: Guangdong, China
MOQ: 1 Piece
Price: Price Negotiable
Payment Terms: L/C,D/A,D/P,T/T
Delivery Time: 5-7 Working Days After Payment
Packaging Details: Standard Export Fumigation-Free Wooden Case Packaging
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
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CAT 3306 Complete Diesel Engine for Construction Excavator

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
ItemSpecification
Engine ModelCAT 3306
Engine TypeInline 6-Cylinder Diesel Engine
Displacement10.5L (638 cu in)
Bore x Stroke4.75" * 6.00"
AspirationNaturally Aspirated / Turbocharged / Aftercooled
Compression Ratio15.0:1 – 17.5:1
Horsepower230 – 350 HP
Torque585 lb-ft+
Fuel SystemDirect Injection / Mechanical Injection
Injection PumpScroll-Type Mechanical Injection Pump
Valve TrainOHV, 2 Valves per Cylinder
Firing Order1-5-3-6-4-2
Cooling SystemWater Cooled
Engine BlockCast Iron with Wet Cylinder Liners
Cylinder HeadCast Iron
Oil Capacity10.25 Gallons
GovernorHydramechanical or Woodward PSG
Dry WeightApprox. 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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