Cat 3066T Engine Specs

The Cat 3066T engine is a powerful and reliable diesel engine widely used in construction machinery, most notably in Caterpillar 320B and 320C excavators. Despite bearing the Caterpillar brand, the 3066T engine is actually manufactured by Mitsubishi Heavy Industries in Japan. Known for its durability and performance in demanding job site conditions, this engine is a favorite among contractors and heavy machinery operators.

Overview of Cat 3066T Engine

The Cat 3066T is a turbocharged six-cylinder diesel engine. It was developed in collaboration with Mitsubishi to meet the high-performance standards of Caterpillar machinery. Designed to deliver excellent torque and fuel efficiency, the engine has proven itself in both urban construction and large-scale infrastructure projects.

Cat 3066T Engine Specs

Below are the detailed cat 3066t engine specs:

• Engine Type: 4-stroke, turbocharged, inline 6-cylinder diesel

• Displacement: 6.6 liters (6600 cc)

• Bore x Stroke: 102 mm x 130 mm

• Compression Ratio: 16.5:1

• Maximum Output Power: Approximately 140 HP (104 kW) @ 1,800 RPM

• Maximum Torque: Around 550 Nm @ 1,400 RPM

• Fuel System: Direct injection

• Cooling System: Water-cooled

• Turbocharger: Yes

• Aspiration: Turbocharged

These cat 3066t engine specs make it ideal for medium-sized excavators like the CAT 320B and CAT 320C, delivering strong digging force and efficient fuel consumption.

Production Years and Serial Number Characteristics

The Cat 3066T engine was primarily produced between 1997 and 2005, a period that aligns with the production of the Caterpillar 320B and 320C models.

Typical serial number prefixes include:

• 7JK, 6LK, and 9KK for early models

• Later units may have prefixes like 6SW or Mitsubishi-specific codes

These numbers help identify the engine’s production batch, date, and country of origin.

Country of Manufacture

All Cat 3066T engines were manufactured in Japan by Mitsubishi Heavy Industries under Caterpillar’s technical and performance standards. This collaboration ensured that the engine met global Caterpillar quality while benefiting from Mitsubishi’s diesel engine expertise.

Applications in Machinery

The Cat 3066T engine is commonly found in:

• Caterpillar 320B excavators

• Caterpillar 320C excavators

These machines are known for their reliability, and much of that reputation is due to the rugged performance of the Cat 3066T engine.