Yanmar 3TNA84 4TNA84 3D84-2 4D84-2 4T84-2 Piston & Pin Assembly 129105-22080

Product Details

Product Overview

This high-quality Piston with Pin assembly, featuring OEM reference number 129105-22080, is a direct replacement for select Yanmar industrial diesel engines. Manufactured to meet or exceed OEM specifications, this component ensures reliable performance and long service life for your excavator, generator, or agricultural machinery. We support global B2B distribution, serving major markets including North America, Europe, Southeast Asia, the Middle East, and Australia with efficient logistics and competitive wholesale pricing.

Key Features & Benefits

• Precision Engineering: Manufactured to strict tolerances for optimal cylinder sealing and compression, maximizing engine power output.
• Superior Durability: Constructed from high-strength alloy material to withstand extreme combustion pressures and temperatures, reducing wear and extending overhaul intervals.
• Complete Assembly: Includes the piston pin and retaining clips, simplifying installation and ensuring proper component matching for reliable operation.
• OEM Replacement: Directly replaces the original Yanmar part number 129105-22080, guaranteeing a perfect fit without modifications.
• Rigorous Testing: Each piston undergoes quality control checks for dimensional accuracy, hardness, and surface finish to ensure consistent performance.

Technical Specifications

OEM Cross-Reference

• Yanmar: 129105-22080
• Alternative/Related Part Numbers: 129105-22070, 129105-22060 (Verify fitment)

Compatibility

• Engine Models: Yanmar 3TNA84, 4TNA84, 3D84-2, 4D84-2, 4T84-2
• Typical Applications: Yanmar industrial diesel engines used in mini excavators, compact track loaders, generators, and agricultural tractors.
• Note: Always verify your engine serial number and piston size (standard, 0.25, 0.50, 0.75, 1.00 oversize) to ensure correct fitment. This listing is for a standard-size piston unless otherwise specified.

Global Supply & Distribution

• Worldwide Shipping: We offer reliable shipping via sea, air, and express courier to all major global destinations.
• Major Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, France, Netherlands), Asia-Pacific (Japan, Korea, Australia, Indonesia), Middle East (UAE, Saudi Arabia), and Africa.
• Fast Delivery: Stock items are dispatched within 24-48 hours. Bulk orders for major ports (e.g., Shanghai, Singapore, Rotterdam, Los Angeles) are handled with priority.
• Export Expertise: We have extensive experience in international trade documentation, customs clearance, and compliance with local regulations.

Quality Assurance

• Manufacturing Standards: Produced in ISO 9001 certified facilities, adhering to strict quality control processes.
• Warranty: Backed by a 12-month warranty against manufacturing defects in materials and workmanship.
• Testing: Each piston is inspected for dimensional accuracy, pin bore alignment, ring groove clearance, and material hardness before packaging.

FAQ

1. What is the difference between the 3TNA84 and 4TNA84 piston?
The 3TNA84 is a 3-cylinder engine, while the 4TNA84 is a 4-cylinder engine. While the piston design and part number (129105-22080) are often shared, you must purchase the correct quantity (3 for a 3-cylinder, 4 for a 4-cylinder) to complete the overhaul. Verify the specific engine model before ordering.

2. How do I know if this piston is the correct size for my engine rebuild?
This listing is for a standard-size piston. If your engine cylinder bore has been machined, you will need an oversize piston (e.g., 0.50mm or 1.00mm). Check the existing piston crown or cylinder head for a stamp (e.g., “0.50”). If you are unsure, measure the cylinder bore or consult your engine’s service manual.

3. What other components should I replace when installing a new piston?
For a reliable rebuild, we strongly recommend replacing the piston rings, cylinder liners (if applicable), connecting rod bearings, main bearings, and all gaskets/seals simultaneously. This ensures uniform wear and prevents premature failure of the new piston assembly.