Caterpillar 3066 Cylinder Block 212-8566 (Fits Mitsubishi S6K)

Precision Engineering : Caterpillar 3066 Block for Industrial Diesel Engine Parts

The Caterpillar 3066 Cylinder Block 212-8566 is a high-volume staple in our wholesale catalog, specifically supporting the massive global fleet of CAT 320C series excavators. Recognizing that this engine is the workhorse of the construction industry, we maintain deep stock levels to ensure rapid turnover for engine rebuilders and parts distributors. This block serves as a direct, drop-in solution for overhauling engines that have suffered from cylinder scoring or block cracking due to overheating.

Uniquely versatile, this casting is engineered to meet the exact specifications of both the Caterpillar 3066 and the Mitsubishi S6K-T engine platforms. Whether you are servicing a CAT 320 excavator or a Mitsubishi industrial application, this block restores original compression and cooling efficiency. It features reinforced webbing to handle the stress of turbocharged applications, providing a durable foundation for extended machine service life.

Technical Specifications for 3066 / S6K Block

Technician’s Note: Installation & Inspection

Oil Jet Configuration: When installing this block for a Turbocharged (3066T / S6KT) application, you MUST verify the installation of the Piston Cooling Jets (Oil Squirters). These are critical for cooling the piston crown. Failure to install or align these jets correctly will lead to piston seizure within hours of operation.

Compatible Equipment for Caterpillar 3066

Why Source Industrial Diesel Engine Parts from Ruich Value?

• Dual Compatibility: Our blocks are machined to accept both Caterpillar and Mitsubishi specific components, reducing inventory complexity for workshops servicing mixed fleets.
• Leak Prevention: 100% Water Jacket Pressure Testing ensures that every 3066 block is free from casting porosity, preventing coolant loss and overheating.
• Surface Finish: The deck surface is CNC ground to a micro-finish that ensures perfect sealing with modern MLS (Multi-Layer Steel) or composite head gaskets.
• Bore Precision: Cylinder bores are semi-finished or finished (depending on spec) to exact tolerances, ensuring optimal ring seating and oil control.
• Export Protection: We use reinforced wooden crate packaging with VCI anti-corrosion film, guaranteeing the block arrives rust-free anywhere in the world.

Complete Caterpillar Cylinder Block Catalog

Our catalog offers comprehensive solutions for Industrial Diesel Engine Parts, supporting everything from mid-range construction equipment to heavy mining machinery.

Category coverage: We supply reliable cylinder blocks for the most popular excavator engines, including the 3066, 3306, C7, and C9 series.

View all specs in our Caterpillar Industrial Cylinder Block Catalog.

Or explore our complete Caterpillar Industrial Diesel Engine Parts Catalog

Technical FAQ: Caterpillar 3066 / S6K Block

Q1: Is this block compatible with Mitsubishi S6K engines?

Yes, the Caterpillar 3066 engine is based on the Mitsubishi S6K platform. Our block 212-8566 is fully compatible with Mitsubishi S6K and S6K-T applications commonly found in other industrial machinery.

Q2: Does this block work for Turbo and Non-Turbo engines?

The casting is generally compatible, but you must check the oil port configuration. Turbocharged engines (3066T) require piston cooling nozzles. Please confirm your engine arrangement code with our team.

Q3: Can I use my old internal parts with this new block?

If your crankshaft and connecting rods are within standard specifications, they can be transferred. However, we always recommend installing new main bearings, rod bearings, and thrust washers when replacing a block.

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