QSL9.3 Piston Ring Set C5267503 C5267504 C5267505 for Cummins Engine Parts

Product Details

Product Overview

This high-quality piston ring set is specifically designed for the Cummins QSL9.3 diesel engine, offering a direct replacement solution for critical engine rebuilds and overhauls. The set includes part numbers C5267503, C5267504, and C5267505, which correspond to the top, intermediate, and oil control rings respectively, ensuring a complete and reliable sealing solution for the combustion chamber.

Manufactured to OEM size specifications, these piston rings are suitable for a wide range of heavy machinery applications, including excavators, trucks, forklifts, bulldozers, buses, and loaders. As a critical component in maintaining engine compression, oil control, and overall performance, this piston ring set provides the durability and precision required for demanding working conditions.

Key Features & Benefits

• OEM Specifications: Manufactured to meet or exceed original equipment manufacturer (OEM) dimensional tolerances for a precise fit in Cummins QSL9.3 engine cylinders.
• Complete Set: Includes all three ring types (compression, intermediate, and oil control) for a comprehensive piston ring replacement solution.
• Durable Material: Constructed from high-grade alloy steel with advanced surface treatments to resist wear, corrosion, and thermal fatigue in high-temperature diesel engine environments.
• Optimized Oil Control: The oil ring design effectively scrapes excess oil from cylinder walls, reducing oil consumption and minimizing carbon buildup in the combustion chamber.
• Enhanced Compression: Precision-ground compression rings ensure optimal cylinder sealing, maximizing engine power output and fuel efficiency during operation.
• Competitive Pricing: Direct factory pricing offers significant cost advantages compared to genuine OEM branded alternatives without compromising on quality or performance.

Technical Specifications

OEM Cross-Reference

This piston ring set is designed as a direct replacement for the following OEM part numbers commonly used in Cummins QSL9.3 engine service kits:

• Cummins Piston Ring Set: C5267503 (Top Ring), C5267504 (Intermediate Ring), C5267505 (Oil Ring)
• Alternative Reference: 4089778, 4089779, 4089780 (cross-reference numbers for verification)

Note: Always verify your engine’s specific ring groove dimensions and ring profile against the original components before installation.

Compatibility

This piston ring set is specifically designed for the Cummins QSL9.3 diesel engine platform. It is commonly used in the following equipment applications:

• Excavators: Various models from Komatsu, Hitachi, and Caterpillar that utilize the QSL9.3 power unit
• Trucks & Buses: Medium-duty commercial vehicles equipped with the Cummins QSL9.3 engine
• Forklifts & Loaders: Heavy material handling equipment requiring reliable diesel power
• Bulldozers & Construction Machinery: Earthmoving equipment operating in demanding environments

Compatibility is inferred based on the engine model. Always confirm your specific engine serial number and ring specifications before ordering.

Global Supply & Distribution

We maintain a robust global supply chain capable of shipping this piston ring set to industrial centers worldwide. Our distribution network covers:

• North America: Fast delivery to major ports including Los Angeles, Houston, and New York/Newark for distribution across the USA, Canada, and Mexico
• Europe: Regular shipments to Rotterdam, Hamburg, and Felixstowe for quick customs clearance and onward delivery
• Asia-Pacific: Direct shipping from our manufacturing facilities in Guangdong and Guizhou, China, to ports in Singapore, Tokyo, Sydney, and Dubai
• Middle East & Africa: Reliable logistics to Jebel Ali (Dubai), Jeddah, and Durban for regional distribution

We offer flexible shipping options including air freight, sea freight (FCL/LCL), and express courier services (DHL, FedEx, UPS) to meet urgent project timelines. Our export team handles all necessary customs documentation and international trade compliance.

Quality Assurance

Every piston ring set undergoes rigorous quality control procedures to ensure reliable performance in the field:

• Manufacturing Standards: Produced in ISO 9001 certified facilities with strict adherence to dimensional tolerances and material specifications
• Testing Procedures: Each batch is tested for ring gap, side clearance, tension, and surface hardness using calibrated inspection equipment
• Warranty Coverage: All products are backed by a 6-month warranty against manufacturing defects in materials and workmanship
• Inspection Reports: Video outgoing inspection and machinery test reports are available upon request for quality verification

FAQ

Q: How do I confirm these piston rings will fit my engine?
A: These rings are specifically designed for the Cummins QSL9.3 diesel engine. Before installation, we recommend measuring your cylinder bore diameter and comparing it to the OEM specifications (typically 137mm bore for standard QSL9.3). Also check the ring groove width and depth in your pistons. If you have a non-standard bore size or modified pistons, please contact us with your engine serial number for verification.

Q: What is the recommended installation procedure?
A: Proper installation is critical for ring performance. Always use a piston ring compressor tool to avoid damaging the rings during installation. Ensure cylinder walls are clean, properly honed, and within wear limits. Install rings in the correct order: oil ring first (bottom groove), then intermediate ring (middle groove), and top compression ring last. Stagger ring end gaps 120 degrees apart and never align gaps with the piston pin bore. Lubricate rings and cylinder walls with clean engine oil before assembly.

Q: How should I store these piston rings before installation?
A: Store the rings in their original packaging in a clean, dry environment at room temperature (15-25°C / 59-77°F). Avoid exposure to moisture, extreme heat, or direct sunlight. Do not stack heavy objects on top of the ring sets, as this can cause deformation. If stored for extended periods, periodically inspect the packaging for damage. Rings should be used within 12 months of purchase for optimal performance.