Heavy-duty replacement cylinder block for CAT 320C excavators. Perfectly matches 3066 and Mitsubishi S6K engines. OEM 212-8566. Factory direct wholesale
Product Categories:
Product Tags:
Send us a message
The Ruich Value 212-8566 is an OEM-spec replacement cylinder block for the Caterpillar 3066 6.4L engine. Fully cross-compatible with the Mitsubishi S6K platform, it features CNC line-bored main saddles and resolves parent-bore cylinder scoring for CAT 320C and 320B excavators. In stock for factory direct wholesale.
The Caterpillar 3066 6.4L diesel engine is the relentless powerhouse driving mid-sized earthmoving equipment across the globe, most notably the CAT 320C series. At its core is the Caterpillar 3066 cylinder block (OEM 212-8566), a highly durable parent-bore (integral cylinder) casting. Ruich Value supplies this premium foundation to exact OEM specifications. Engineered from high-density gray cast iron, our blocks restore factory structural rigidity and cylinder geometry for fleets operating in aggressive mining, forestry, and construction environments.
A distinct challenge with the 3066 and its sister engine, the S6K, is their parent-bore architecture. Unlike sleeved engines, abrasive dirt intrusion or prolonged overheating leads directly to irreversible cylinder wall scoring. When the cylinders can no longer be safely bored to oversize limits, or if the engine experiences catastrophic main bearing saddle cracking due to hydraulic overload, a new casting is mandatory. Our CAT 3066 engine replacement blocks provide a clean, factory-standard slate, completely eliminating the risks associated with welding or custom-sleeving heavily damaged original cores.
One of the greatest advantages of this platform is the CAT 3066 vs Mitsubishi S6K interchangeability. Engine rebuilders seeking a reliable 320C excavator cylinder block can utilize our 212-8566 casting to service both Caterpillar equipment and Mitsubishi industrial machinery. Every CNC line-bored block we dispatch comes with perfectly matched main bearing caps and undergoes rigorous metallurgical inspection. By choosing our wholesale CAT engine blocks, independent workshops bypass prolonged dealer backorders and secure a mathematically exact fit for their 6.4L inline-6 diesel rebuilds.
| Parameter | Technical Value |
|---|---|
| Primary OEM Number | 212-8566 / 2128566 |
| Engine Compatibility | Caterpillar 3066 / Mitsubishi S6K |
| Cylinder Architecture | Parent-Bore (Integral Cylinders) |
| Bore x Stroke | 102.0 mm x 130.0 mm |
| Displacement | 6.4L (6,373 cc) |
| Material Grade | High-Density Gray Cast Iron Alloy |
| Main Bearings | Caps Included, CNC Line-Bored |
Our heavy-duty engine block and rotating assembly catalog thoroughly covers the Caterpillar 300-series excavator engines. Explore our complete Caterpillar Categories for matching S6K/3066 crankshafts, loaded cylinder heads, and master rebuild kits.
| Engine Model | Part Number | Application |
|---|---|---|
| 3116 | 149-5403 | Excavator: 320B, 322B, 325B Grader: 120H |
| 3066 / S6K | 212-8566 | Excavator: 320C, 320D, 312C Mitsubishi: S6K-T |
| 3306 | 1N3576 | Dozer: D6D, D7G Grader: 12G, 140G Truck: 3306 DI |
| 3304 | 1N3574 | Dozer: D4E Loader: 951, 955, 963 |
| C15 (ACERT) | 229-8508 | Excavator: 365C, 385C Dozer: D8T Truck: C15 On-Highway |
| C18 | 261-0052 | Loader: 988H Excavator: 385C L GenSet: C18 |
| C4.4 | 225-5462 | Backhoe: 416E, 420E Excavator: 320D GC Perkins: 1104D |
| Make | Machine Model | Year Range | Engine | Application |
|---|---|---|---|---|
| Caterpillar | 320C / 320C L / 320C LN | 2001–2006 | CAT 3066 | Track Excavator |
| Caterpillar | 320B / 320B L / 320B N | 1996–2001 | CAT 3066 | Track Excavator |
| Caterpillar | 321C LCR | 2004–2008 | CAT 3066 | Compact Radius Excavator |
| Mitsubishi | Various Industrial Equipment | 1990–2005 | Mitsubishi S6K | Generators / Marine |
Answer: Yes, structurally they are identical. Caterpillar partnered with Mitsubishi to utilize the highly reliable S6K 6.4L inline-6 diesel engine in their 320B and 320C excavators, renaming it the CAT 3066. The 212-8566 bare cylinder block casting drops directly into either application, utilizing the same 102mm bore diameter and mounting points for all accessories.
Diagnosis: The 3066 is a “parent bore” engine, meaning the cylinders are bored directly into the cast iron block without replaceable wet liners. If you experience severe cylinder wall scoring, you can bore it oversize. While some machine shops attempt to install aftermarket repair sleeves, this significantly weakens the block webbing. Solution: If the scoring exceeds standard oversize limits, replacing the bare block with our new casting is the most structurally sound and long-lasting repair method.
Answer: Yes. Because main bearing saddles must be perfectly circular, the caps are installed, torqued to specification, and then the entire tunnel is CNC line-bored. You cannot mix and match main caps from an old block onto a new one. Our replacement blocks come with their specific, matched main caps pre-installed to ensure your crankshaft drops in flawlessly.
📱 WhatsApp: +86 13889277673
📧 Email: [email protected]
⚡ Fast response | Factory direct | Global shipping | ISO 9001 Certified
For Any Inquiries, please feel free to contact us, Our sales teams are always glad to support your business
