Description
Cylinder Liner Kit Caterpillar 3066 / C6.4
This complete Caterpillar 3066 / C6.4 Cylinder Liner Kit is designed for selected heavy-duty diesel engine applications and provides the main components required for a single-cylinder rebuild or engine overhaul.
The kit is intended to restore proper cylinder compression, piston movement, sealing and oil control while maintaining the correct dimensional requirements for the engine application.
Kit Components
| Component | Reference Part Number |
| Piston Body – Standard | 2977751 |
| Piston Pin / Wrist Pin | 0947134 |
| Piston Pin Retainer | 5I7667 |
| Piston Ring Set – Standard, Single Cylinder | 1786543 |
| Cylinder Sleeve / Repair Liner | 5I7523 |
| Liner Seals | Included |
Technical Specifications
| Specification | Value |
| Engine Family | Caterpillar 3066 / C6.4 |
| Bore Size | 102 mm / 4.01 in |
| Piston Height | 97.8 mm / 3.85 in |
| Piston Material | Cast Aluminum Alloy |
| Piston Ring Diameter | 102 mm / approx. 4.016 in |
| Piston Pin Diameter | Approx. 34 mm / 1.339 in |
| Piston Pin Length | Approx. 84 mm / 3.307 in |
| Cylinder Sleeve Inside Diameter | Approx. 101.50 mm / 3.996 in |
| Cylinder Sleeve Outside Diameter | Approx. 105.00 mm / 4.134 in |
| Cylinder Sleeve Overall Length | Approx. 195.50 mm / 7.697 in |
| Voltage | Not Applicable – Mechanical Component |
Engine Compatibility
Designed for selected Caterpillar 3066 and C6.4 diesel engine applications.
Compatible Equipment
This Caterpillar cylinder liner kit family is commonly associated with excavator applications including:
318C, 319C, 320C, 320C FM, 320C L, 320D, 320D L, 320D LRR, 320D RR, 321C, 323D S, 323D L and 323D LN.
Important: Engine configurations can vary within the same equipment model. Please contact us with your engine model, serial number or arrangement number before ordering to confirm correct fitment.
Function of the Cylinder Liner Kit
The cylinder liner kit replaces the primary wear components inside one engine cylinder. The piston converts combustion pressure into mechanical force, while the piston rings maintain compression and help control engine oil.
The piston pin connects the piston to the connecting rod, while the cylinder sleeve provides the precision running surface required for correct piston travel and cylinder sealing.
Key Features
- Complete single-cylinder rebuild configuration
- 102 mm standard bore application
- Designed for Caterpillar 3066 / C6.4 engines
- Includes piston, rings, piston pin, retainer, cylinder sleeve and liner seals
- Heavy-duty replacement components
- Suitable for engine overhaul and cylinder repair
- Designed for professional diesel engine service applications
Included Component References
Piston Body STD: 2977751
Piston Ring Set: 1786543
Piston Pin: 0947134
Piston Pin Retainer: 5I7667
Cylinder Sleeve / Repair Liner: 5I7523
Installation Notes
Professional installation is recommended. Before assembly, inspect liner fit, piston-to-liner clearance, piston ring end gap, connecting rod condition and lubrication system condition.
Always follow the applicable engine service manual for installation procedures, tolerances and tightening specifications.
Fitment Verification
Need help confirming compatibility? Contact us with your equipment model, engine model, engine serial number or arrangement number. Our team can help verify the correct application before purchase.
Caterpillar® and CAT® are registered trademarks of Caterpillar Inc. Secondary component part numbers are shown for reference and identification purposes only. Product appearance and kit contents may vary by manufacturer or supplier. Always verify fitment before installation.
