Caterpillar C6.4 320d Engine Piston Ring 5i-7669 Diesel Engine Repair Parts

Product Details

Product Overview

This piston ring set, OEM reference number 5i-7669, is a precision-engineered component designed for the Caterpillar C6.4 diesel engine. Commonly used in the Caterpillar 320d excavator, this piston ring is a critical part of the engine’s power cylinder assembly, ensuring optimal compression, oil control, and combustion efficiency.

Manufactured to OEM size specifications, this replacement part is ideal for maintenance and overhaul of heavy equipment used in construction, industrial, agricultural, genset, and marine applications. As a direct-fit component, it is designed to restore engine performance and extend service life when replacing worn or damaged rings.

Key Features & Benefits

• OEM Specification Fit: Manufactured to match the original Caterpillar size and profile (5i-7669), ensuring compatibility with C6.4 engine piston assemblies without modification.
• Durable Material Composition: Constructed from high-grade alloy iron for superior wear resistance, thermal stability, and long service life under high-temperature, high-pressure diesel combustion conditions.
• Optimized Oil Control: Engineered ring profile provides effective oil scraping and sealing, reducing oil consumption and blow-by while maintaining proper cylinder lubrication.
• Compression Integrity: Precision-ground ring faces ensure a tight seal against the cylinder wall, maximizing compression pressure for improved fuel efficiency and power output.
• Rigorous Quality Testing: Each batch undergoes outgoing inspection and machinery test report verification to confirm dimensional accuracy and material integrity before shipment.
• Versatile Application: Suitable for a wide range of heavy equipment including excavators, loaders, generators, and marine engines powered by the Caterpillar C6.4 diesel platform.

Technical Specifications

OEM Cross-Reference

This piston ring set is a direct replacement for the following original Caterpillar part numbers:

• 5i-7669 (Primary OEM Reference)
• Compatible with all Caterpillar C6.4 engine piston ring sets using this reference number.

Note: Always verify your engine’s specific piston and ring configuration before ordering. This part replaces the OEM number listed above; cross-reference with your engine’s serial number for confirmation.

Compatibility

This piston ring is specifically designed for the Caterpillar C6.4 diesel engine and is commonly used in the following equipment:

• Caterpillar 320d Excavator (primary application)
• Other Caterpillar machinery utilizing the C6.4 engine platform in construction, agriculture, genset, and marine applications.

Fitment is inferred based on engine model and OEM part number. Please verify your engine serial number and current piston ring specifications (size, profile) before purchase.

Global Supply & Distribution

We offer worldwide shipping from our logistics hub in Guangdong, China, with fast and reliable delivery to major ports and industrial centers across North America, Europe, Asia-Pacific, the Middle East, Africa, and Latin America. Our export experience ensures smooth customs clearance and international trade compliance. Whether you are a maintenance shop in Texas, a dealer in Dubai, or a fleet operator in Germany, we provide efficient logistics solutions to minimize downtime.

Quality Assurance

Our piston rings are manufactured under strict quality control procedures, with each batch undergoing outgoing inspection and machinery test reports to verify dimensional accuracy, material hardness, and surface finish. We provide a 6-month warranty against manufacturing defects. Video inspection of the product is available upon request for added confidence. All parts are carefully packed in plastic bags, boxes, and cartons to prevent damage during transit.

FAQ

Q1: How do I verify that this piston ring (5i-7669) fits my Caterpillar 320d excavator engine?
A: This ring is designed for the C6.4 engine. To confirm fitment, check your engine’s serial number and compare it with the OEM part number 5i-7669 on the original ring or your engine parts manual. Measure the cylinder bore diameter and piston groove dimensions to ensure they match OEM specifications. If you have any doubts, contact us with your engine serial number for assistance.

Q2: Can I install this piston ring without special tools?
A: Professional installation is strongly recommended. Piston rings require careful handling to avoid breakage and must be installed using a ring expander tool to prevent distortion. The ring end gaps must be checked and adjusted to the manufacturer’s specifications (typically 0.30-0.50 mm for the top ring) using a feeler gauge. Improper installation can lead to engine damage or reduced performance.

Q3: What is the recommended break-in procedure after installing new piston rings?
A: After installation, follow a proper break-in procedure: Start the engine and allow it to reach operating temperature at idle. Then, perform several light-load cycles (avoiding high RPM or full throttle) for the first 50 hours of operation. This allows the rings to seat properly against the cylinder walls. Change the engine oil and filter after the break-in period to remove any wear particles from the seating process.