Diesel Engine Parts Piston 5343091 5305190 4309477 For Cummins L9.3 6l 6lt 6lt9.3 Qsl9.3 6ltaa9.3

Product Details

Product Overview

This high-quality diesel engine piston, identified by OEM part numbers 5343091, 5305190, and 4309477, is specifically designed for the Cummins L-Series engine family. It is a direct replacement component for engines including the Cummins L9.3, QSL9.3, 6LT9.3, and 6LTAA9.3.

Commonly utilized in heavy-duty construction machinery such as Cummins-powered excavators and wheel loaders, this piston is engineered to restore engine compression, reduce oil consumption, and ensure reliable performance under demanding working conditions. As a critical internal engine part, it meets or exceeds OEM specifications for dimensional accuracy and material strength.

Key Features & Benefits

• Precision Engineering: Manufactured to strict tolerances (116mm standard diameter) ensuring a perfect fit for Cummins L9.3 series engines.
• Durable Material Options: Available in high-strength forged steel or forged aluminum alloy to withstand extreme combustion pressures and temperatures.
• Verified Compatibility: Cross-referenced against multiple OEM numbers (5343091, 5305190, 4309477) for easy identification and replacement.
• Enhanced Engine Performance: Restores compression ratios and minimizes blow-by, improving fuel efficiency and power output.
• Long Service Life: Designed to reduce wear on cylinder liners and rings, extending overall engine overhaul intervals.
• Comprehensive Testing: Every batch undergoes machinery test reports and outgoing inspection to guarantee quality.

Technical Specifications

OEM Cross-Reference

This piston is a direct replacement for the following OEM and interchange numbers. Verify your existing part number before ordering.

• Primary OEM: 5343091
• Alternative OEM: 5305190
• Alternative OEM: 4309477

Compatibility

This component is commonly used for the following engine models and applications. Always cross-check your engine serial number for absolute fitment confirmation.

• Engine Models: Cummins L9.3, QSL9.3, 6LT9.3, 6LTAA9.3
• Vehicle/Equipment Fitment: Commonly used for Cummins-powered Excavators and Wheel Loaders, as well as other heavy construction machinery utilizing these engine platforms.
• Application: Construction Machinery (Excavators, Loaders)

Global Supply & Distribution

As a leading supplier based in Guangdong, China, we offer worldwide shipping capabilities to support international B2B buyers. Our logistics network ensures fast and reliable delivery to major ports and industrial centers across North America, Europe, Asia-Pacific, the Middle East, Africa, and South America.

We have extensive export experience and comply with international trade standards, providing flexible shipping options including sea freight, air freight, and express courier services. Whether you are a distributor, repair shop, or fleet manager, we can efficiently fulfill orders of any volume.

Quality Assurance

Our manufacturing process adheres to strict quality control standards. Each piston is produced using high-grade materials and precision machining to ensure durability and reliability.

• Testing: Outgoing video inspection and machinery test reports are provided upon request.
• Warranty: Backed by a 6-month to 12-month warranty against manufacturing defects.
• Standards: Components are designed to meet or exceed original equipment (OEM) specifications.

FAQ

Q: How can I confirm if this piston (5343091) fits my engine?
A: Verify your engine model and existing part number. This piston is designed for the Cummins L9.3, QSL9.3, 6LT9.3, and 6LTAA9.3 engines. It is a standard size (116mm) piston. If your engine block or cylinder liner has been previously machined, you may require an oversized piston. Please check your service manual or consult a mechanic.

Q: What is the recommended installation procedure for this piston?
A: Installation should be performed by a qualified diesel mechanic. Key steps include: cleaning the cylinder bore, lubricating the piston and rings with clean engine oil, using a proper ring compressor, and torquing the connecting rod bolts to the manufacturer’s specified settings. Always replace piston rings and wrist pins simultaneously.

Q: What maintenance is required after installing a new piston?
A: After installation, a proper engine break-in period is recommended. This typically involves running the engine at varying loads (avoiding prolonged idling or full throttle) for the first 50-100 hours. Ensure the engine oil and coolant are at correct levels, and monitor for any unusual noises or leaks. Regular oil changes with the correct grade of oil will maximize the lifespan of the new piston.