3TN78 3D78-1 Engine Piston with Pin 129100-22080 for Yanmar Machinery Parts

Product Details

Product Overview

This high-quality replacement piston (Part Number: 129100-22080) is engineered specifically for Yanmar 3TN78 and 3D78-1 diesel engines. Designed as a direct OEM-size replacement, this component is critical for maintaining compression, power output, and fuel efficiency in a wide range of industrial and agricultural machinery. The piston is supplied complete with a wrist pin, ensuring a ready-to-install solution for your engine overhaul or repair project.

Manufactured by, this piston meets the rigorous demands of construction, agricultural, marine, and generator set applications. It is a robust aftermarket alternative that provides reliable performance, helping to restore your Yanmar engine to its original operating specifications. The component is commonly used for engine rebuilds and maintenance in excavators, tractors, and other heavy equipment powered by these compact diesel engines.

Please verify your engine model (3TN78 or 3D78-1) and the original part number (129100-22080) to ensure correct fitment before purchase.

Key Features & Benefits

• OEM Specification: Manufactured to original equipment (OEM) size and tolerances, ensuring a direct, seamless fit for Yanmar 3TN78 and 3D78-1 engines.
• Complete Assembly: Includes the piston and wrist pin (129100-22080), reducing the need for separate sourcing and simplifying installation.
• Durable Construction: Built from high-grade cast iron or aluminum alloy (as per OEM design) to withstand high temperatures, pressures, and continuous operation in demanding environments.
• Reliable Performance: Restores compression, reduces oil consumption, and improves overall engine power and efficiency, extending the life of your machinery.
• Rigorous Testing: Each batch undergoes quality inspection, including dimensional checks and material verification, to ensure consistent performance and long service life.
• Cost-Effective Solution: Provides a high-quality alternative to genuine Yanmar parts, offering excellent value without compromising on fit or function.

Technical Specifications

OEM Cross-Reference

This piston assembly is a direct replacement for the following original Yanmar part numbers:

• Yanmar OEM Number: 129100-22080

This part is designed to match the specifications of the original Yanmar piston used in the 3TN78 and 3D78-1 engine series. If your existing part has a different number, please contact us for cross-verification assistance.

Compatibility

This piston is specifically designed for Yanmar diesel engines. It is commonly used for the following engine models:

• Yanmar 3TN78
• Yanmar 3D78-1

Common Applications (Inferred): This piston is typically found in machinery powered by the above engines, including compact excavators, mini tractors, agricultural tillers, small generator sets, marine auxiliary engines, and industrial pumps. Always verify your engine model before ordering.

Global Supply & Distribution

We offer worldwide shipping to support your business operations, no matter where you are located. Our logistics network ensures fast and reliable delivery to major industrial hubs, ports, and inland destinations.

• Major Markets Served: North America, Europe (EU), Southeast Asia, Middle East, Africa, Australia, and South America.
• Shipping Options: Express (DHL, FedEx, UPS) for urgent orders, Air Freight for medium-sized shipments, and Sea Freight (FCL/LCL) for large-volume orders to major ports like Rotterdam, Los Angeles, Shanghai, and Dubai.
• Export Experience: We have extensive experience in international trade, ensuring all documentation (commercial invoice, packing list, certificate of origin) is handled correctly for smooth customs clearance.

Quality Assurance

We prioritize quality control to ensure you receive a reliable product. Our manufacturing process adheres to strict industry standards.

• Manufacturing Standards: Products are manufactured in ISO-compliant facilities, ensuring consistency and precision.
• Testing: Machinery test reports and video inspection are available upon request, demonstrating our commitment to quality.
• Warranty: We provide a 6-month warranty against manufacturing defects. This covers material and workmanship issues under normal use.

FAQ

Q1: How can I confirm this piston fits my Yanmar 3TN78 engine?
A: Please check the engine model plate on your block. It should clearly state “3TN78” or “3D78-1”. Then, verify your existing piston part number. If it matches 129100-22080, this part is a direct fit. If you have a different number, please contact our support team with your engine serial number for cross-referencing.

Q2: Does this piston kit include piston rings and the pin?
A: This product includes the piston and the wrist pin (part number 129100-22080). It does not include piston rings or circlips in the standard package. We recommend ordering piston rings separately to complete your rebuild. Please check our store for the matching ring set for the 3TN78/3D78-1 engine.

Q3: What is the recommended installation procedure for this piston?
A: Installation should be performed by a qualified diesel mechanic. Key steps include: 1) Thoroughly clean the cylinder bore and piston. 2) Lubricate the piston, pin, and cylinder walls with clean engine oil. 3) Use a piston ring compressor to install the piston into the bore, ensuring the ring gaps are staggered. 4) Torque the connecting rod bolts to the manufacturer’s specifications. Always consult the Yanmar service manual for your specific engine model.