Product Overview

This high-quality piston and pin assembly is engineered for the reliable repair and overhaul of Yanmar industrial diesel engines. Designed as a direct replacement for original parts, it ensures optimal engine performance and longevity. We specialize in global B2B supply, serving major industrial markets across North America, Europe, Asia-Pacific, and the Middle East with efficient logistics to key ports and industrial hubs.

Key Features & Benefits

• Precision Engineered: Manufactured to exact OEM specifications for a perfect fit and seamless installation.
• Superior Durability: Made from high-grade aluminum alloy for excellent strength-to-weight ratio and thermal conductivity.
• Optimized Performance: Precision-machined skirt and ring grooves ensure proper sealing, compression, and reduced oil consumption.
• Includes Piston Pin: Comes complete with a hardened steel piston pin for a complete, ready-to-install assembly.
• Cost-Effective Solution: Provides OEM-level quality and performance at a competitive price, reducing downtime and maintenance costs.

Technical Specifications

OEM Cross-Reference

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

• Yanmar: 129105-22080

It is compatible with engines bearing the following model designations:

• 3TNA84
• 4TNA84
• 3D84-2
• 4D84-2
• 4T84-2

Compatibility

This piston assembly is designed for Yanmar’s compact industrial diesel engines, commonly found in a wide range of machinery including:

• Generators & Power Plants
• Construction Equipment (e.g., compact excavators, rollers)
• Agricultural Machinery (e.g., tractors, pumps)
• Marine Auxiliary Engines
• Industrial Pumps and Compressors

Please verify your engine’s model number (typically found on the engine nameplate) before ordering to ensure correct fitment.

Global Supply & Distribution

We are a trusted partner for engine workshops, machinery dealers, and industrial suppliers worldwide. Our streamlined export process ensures reliable delivery to your location.

• Worldwide Shipping: We ship to all major continents via air and sea freight.
• Key Markets: Extensive experience supplying to North America (USA, Canada, Mexico), the European Union, the United Kingdom, Australia, Southeast Asia, the Middle East, and Africa.
• Fast Delivery: Consolidated shipments to major ports like Los Angeles, Rotterdam, Singapore, Dubai, and Sydney, with reliable inland forwarding options.
• Export Compliance: All documentation (Commercial Invoice, Packing List, Certificate of Origin) is provided professionally for smooth customs clearance.

Quality Assurance

We are committed to supplying parts that meet the highest standards of performance and reliability.

• Manufacturing Standards: Produced in ISO-certified facilities using advanced CNC machining and quality control processes.
• Material Certification: Raw materials are sourced from certified suppliers to ensure consistent metallurgical properties.
• Dimensional Inspection: Each batch undergoes rigorous checks for critical dimensions, including bore, ring groove width, and pin hole diameter.
• Warranty: Backed by a standard warranty against manufacturing defects. Contact us for specific warranty terms applicable to your region.

FAQ

Q: How can I confirm this piston will fit my specific Yanmar engine?
A: The most reliable method is to match the part number. Locate the engine model and serial number on the engine’s nameplate. This piston is designed for engines models 3TNA84, 4TNA84, 3D84-2, 4D84-2, and 4T84-2. You can also compare it with your original piston’s dimensions and part number (129105-22080).

Q: Is the piston pin included, and does it require fitting?
A: Yes, this is a complete assembly that includes the piston pin. The pin is supplied as a separate component within the package. Proper installation requires checking the pin fit in the connecting rod small end, as per standard engine rebuild procedures.

Q: Do you recommend installing new piston rings and cylinder liners with this piston?
A: For an optimal engine rebuild and to ensure maximum performance and longevity, we strongly recommend replacing piston rings and inspecting/replacing the cylinder liner concurrently. Mating a new piston with worn rings or a scored liner will compromise compression, oil control, and the life of the new piston.

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 .