Product Overview

This high-performance replacement piston is engineered for Cummins ISB5.9 diesel engines, offering a reliable solution for engine rebuilds and overhauls. We supply this critical component to a global network of distributors, workshops, and industrial operators, with major markets including North America, Europe, the Middle East, and Asia-Pacific. Manufactured to precise OEM specifications, it ensures seamless integration and restored engine performance.

Key Features & Benefits

• Precision Engineering: Manufactured to exact OEM dimensions (OEM Size) for a perfect fit and optimal compression, eliminating the need for modifications during installation.
• Enhanced Durability: Constructed from high-grade materials to withstand the high-pressure and thermal stresses of diesel combustion, ensuring long service life and reliability.
• Performance Restoration: Designed to restore original engine power, fuel efficiency, and emission performance, critical for both on-road and off-road applications.
• Comprehensive Support: Backed by a 6-month warranty and post-warranty online technical support, providing confidence and assistance for your projects.
• Quality Verified: Each batch is supported by machinery test reports and video outgoing-inspection records, guaranteeing consistent quality and performance standards.

Technical Specifications

OEM Cross-Reference

This piston directly replaces the following OEM part number:

• Cummins: 3970192

It is the correct component for standard rebuilds of the ISB5.9 engine platform. Please verify your engine’s specific configuration (e.g., turbocharged, aftercooled) for complete compatibility.

Compatibility

This piston is designed for Cummins B-Series 5.9-liter diesel engines. Primary applications include:

• Engine Models: ISB5.9, ISB5.9L, 4BT, 6BT, 6BTA, 4BTA, 6BTAA.
• Vehicle & Equipment Applications: Dodge Ram trucks with Cummins diesel, industrial generators (Gensets), construction machinery (excavators, loaders), agricultural equipment (tractors, combines), marine propulsion engines, and material handling equipment.
• Application Sectors: Construction, Industry, Agriculture, Power Generation (Genset), Marine, and Handling.

Global Supply & Distribution

We are a specialized exporter of heavy-duty engine components with extensive experience in international logistics and trade compliance. Our supply chain is optimized for fast, reliable delivery to key industrial regions worldwide.

• Worldwide Shipping: We ship to all major global markets, including North America (USA, Canada), Europe (UK, Germany, Benelux), Asia-Pacific (Australia, Southeast Asia), the Middle East, and Africa.
• Efficient Logistics: Orders are processed rapidly and shipped via air or sea freight to major ports and logistics hubs, ensuring timely delivery to your workshop or warehouse.
• Export Expertise: All documentation, including commercial invoices, packing lists, and certificates of origin, is prepared to meet international customs requirements for a smooth import process.

Quality Assurance

Our commitment to quality ensures you receive a component that meets the demanding standards of professional engine rebuilding.

• Manufacturing Standards: Produced in ISO-certified facilities using advanced machining and metallurgical processes to ensure dimensional accuracy and material integrity.
• Warranty: Protected by a 6-month warranty against manufacturing defects.
• Testing & Inspection: Rigorous quality control includes dimensional checks, material analysis, and performance validation. A machinery test report and video record of the outgoing inspection are available to verify product condition prior to shipment.
• After-Sales Support: Online technical support is available after the warranty period for installation guidance and troubleshooting.

FAQ

Q1: Is this piston a direct replacement for my Cummins 6BT engine, or will I need to machine the cylinder block?
A1: This is a direct OEM-size replacement. It is manufactured to the original Cummins specifications, meaning it should fit into a standard, unworn cylinder bore without requiring machining. However, standard engine rebuilding practice always involves measuring the cylinder bore and the new piston to ensure correct clearance.

Q2: Does this part include piston rings and wrist pins, or is it just the piston itself?
A2: The product listing specifies a single piston. It typically does not include rings, wrist pins, or retainers unless explicitly stated as part of a kit. Please confirm the contents of your order or inquire about complete piston assembly kits.

Q3: My engine is used in a marine application. Is this piston suitable for high-load, continuous operation?
A3: Yes. The Cummins B-Series engine, including the ISB5.9L, is a proven platform for marine propulsion and auxiliary power. This replacement piston is designed to meet the same material and performance specifications required for such demanding, continuous-duty applications in gensets and marine engines.

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 .