Product Overview

This is a premium-quality piston assembly, part number 4089669, engineered as a direct replacement for Cummins ISB325 diesel engines. Designed for durability and performance, this component is essential for engine overhauls, rebuilds, and maintenance in commercial and industrial applications. We specialize in global B2B supply, offering reliable shipping to major markets including North America, Europe, the Asia-Pacific region, and the Middle East to support workshops, fleet operators, and distributors worldwide.

Key Features & Benefits

• Precision Engineering: Manufactured to exact OEM specifications for a perfect fit and optimal engine performance.
• Superior Durability: Constructed from high-grade materials to withstand high compression and thermal stresses, ensuring long service life.
• Enhanced Performance: Designed to maintain proper compression and combustion efficiency, contributing to fuel economy and power output.
• Complete Assembly: Typically includes piston, rings, and wrist pin as a ready-to-install unit, saving valuable workshop time.
• Cost-Effective Solution: Provides OEM-level quality at a competitive price, reducing total cost of ownership for fleets and operators.

Technical Specifications

OEM Cross-Reference

This part serves as a direct replacement for the following OEM number:

• Cummins: 4089669

Please verify the specific part number from your engine’s documentation or old part prior to ordering.

Compatibility

This piston assembly is specifically designed for the Cummins ISB325 diesel engine platform. Common applications include:

• Vehicle Applications: Medium and heavy-duty trucks, school buses, and commercial vehicles powered by the ISB325 engine.
• Industrial Applications: Power generator sets, construction equipment, and marine auxiliary engines utilizing this engine model.

Compatibility is based on engine model. Always confirm your engine’s serial number or model designation for final verification.

Global Supply & Distribution

We are a trusted partner in the global automotive aftermarket supply chain. Our logistics network ensures efficient delivery to key industrial hubs and ports worldwide.

• Worldwide Shipping: We export to all major continents, including North America (USA, Canada, Mexico), Europe (UK, Germany, Netherlands), Asia-Pacific (Australia, Singapore, Japan), and the Middle East (UAE, Saudi Arabia).
• Efficient Logistics: We work with leading freight forwarders to offer competitive sea and air freight options for container (FCL/LCL) and smaller shipments.
• Trade Compliance: All documentation (commercial invoice, packing list, certificate of origin) is prepared professionally to ensure smooth customs clearance.
• B2B Focus: Dedicated support for wholesalers, distributors, and large-scale repair facilities with volume pricing and consistent supply.

Quality Assurance

We partner with ISO-certified manufacturers to guarantee the reliability of every part.

• Manufacturing Standards: Components are produced in facilities adhering to strict quality management systems (ISO 9001).
• Rigorous Testing: Each piston undergoes dimensional checks, material analysis, and performance validation to ensure it meets critical tolerances.
• Warranty: Backed by a standard warranty against manufacturing defects. Specific warranty terms are provided with the commercial invoice.
• Supply Chain Integrity: Our sourcing process ensures traceability and consistent quality across all production batches.

FAQ

Q: How do I confirm this piston is the correct part for my Cummins ISB325 engine?
A: The most reliable method is to match the part number. Locate the part number stamped on your original piston or find it in your engine’s service manual. Cross-reference it with our part number 4089669. Providing your engine’s full serial number (ESN) can also help us confirm compatibility.

Q: Is this piston sold as a single unit or as a set for the entire engine?
A: This listing is typically for a single piston assembly. For a complete engine rebuild, you would need one piston per cylinder (e.g., 6 pistons for a 6-cylinder ISB325). Please contact our sales team for volume pricing on full engine sets.

Q: What are the recommended installation procedures to ensure longevity?
A: For optimal performance, we recommend: 1) Inspecting and honing the cylinder liner to the correct surface finish. 2) Checking all clearances (ring end gap, piston-to-liner) as specified in the Cummins service manual. 3) Using new connecting rod bolts and following the proper torque sequence. 4) Ensuring the engine cooling and lubrication systems are clean and functioning properly before commissioning.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .