Cummins QSB4.5 Piston Set 4089462 4089725 3939398 3969000 – Engine Piston Assembly

Product Details

Product Overview

This high-performance piston set is specifically engineered for the Cummins QSB and QSB4.5 diesel engine platforms. Designed as a direct replacement for original equipment, this set offers exceptional reliability and performance for heavy-duty machinery. We ship globally to North America, Europe, Asia-Pacific, the Middle East, and South America, ensuring fast delivery to major industrial ports and centers worldwide.

Key Features & Benefits

• Direct Fitment: Precision-engineered to OE specifications for a seamless, drop-in installation.
• Superior Durability: Manufactured from high-strength alloy steel to withstand extreme combustion pressures and temperatures.
• Enhanced Performance: Optimized ring groove design reduces blow-by and oil consumption, maximizing engine efficiency.
• Wear Resistance: Advanced surface treatment minimizes friction and extends service life in demanding applications.
• Strict Quality Control: Every piston undergoes rigorous inspection for dimensional accuracy and material integrity.

Technical Specifications

OEM Cross-Reference

This piston set is a direct replacement for the following OEM numbers:

• Cummins Part Numbers: 4089462, 4089725, 3939398, 3969000
• Alternative/Interchange Numbers: 4089461, 4089726, 3969001

Compatibility

This piston set is designed for the following engine applications:

• Engine Models: Cummins QSB4.5, QSB 4.5L
• Common Applications: Construction machinery (excavators, loaders), agricultural tractors, generator sets, and industrial equipment utilizing the QSB platform.
• Year Ranges: Primarily fits Tier 3 and Tier 4 Interim / Stage IIIA engine models.

Global Supply & Distribution

We are a leading supplier of heavy-duty engine components with a robust global logistics network.

• Worldwide Shipping: We ship to all continents via air, sea, and express courier.
• Major Markets Served: USA, Canada, Germany, UK, UAE, Saudi Arabia, Australia, Singapore, Brazil, and South Africa.
• Fast Delivery: Standard inventory ensures quick dispatch to major ports like Rotterdam, Dubai, Shanghai, and Houston.
• Trade Compliance: Experienced in international export documentation and customs clearance.

Quality Assurance

• Manufacturing Standards: Produced under ISO 9001:2015 certified facilities.
• Material Certification: All raw materials are traceable and tested for chemical composition.
• Testing: 100% dimensional inspection and hardness testing performed before shipment.
• Warranty: 12-month warranty against manufacturing defects under normal operating conditions.

FAQ

Q1: Will this piston set fit my Cummins QSB4.5 engine from a 2012 excavator?
A: Yes, these pistons are designed for the QSB4.5 platform. However, we recommend verifying your engine’s serial number or the existing piston part number (e.g., 4089462 or 4089725) to ensure 100% compatibility, as some internal updates occurred during the Tier 4 transition.

Q2: What is included in the set? Do I need to buy rings and pins separately?
A: This is a complete piston assembly set. It includes the piston, wrist pin, and retaining clips. For optimum performance, we recommend purchasing a new set of piston rings (e.g., Part 4089463) separately, as rings are typically not included in this assembly.

Q3: What is the recommended installation procedure for these pistons?
A: Installation should follow the Cummins service manual. Key steps include: 1) Clean the cylinder bore thoroughly. 2) Lubricate the piston skirt and rings with clean engine oil. 3) Use a proper ring compressor to install the piston into the bore. 4) Ensure the arrow on the piston crown points toward the front of the engine. 5) Torque the connecting rod bolts to the factory specification in the correct sequence.