4D92E 4TNE92 Piston 129904-22120 for Yanmar Engine Parts Construction Agriculture

Product Details

Product Overview

This high-quality piston, part number 129904-22120, is a precision engine component specifically designed for the Yanmar 4D92E and 4TNE92 diesel engine models. As a critical element of the engine’s combustion system, this piston ensures reliable power transfer and efficient fuel burn.

Manufactured to OEM size specifications, this replacement part is commonly utilized in a wide range of heavy-duty applications, including construction machinery, industrial equipment, agricultural tractors, generator sets, marine vessels, and material handling equipment. It is engineered to meet the rigorous demands of continuous operation in these environments.

This piston is an ideal direct replacement for the original Yanmar component, offering a cost-effective solution for engine overhauls and repairs without compromising on fit or performance.

Key Features & Benefits

• Precision Engineering: Manufactured to strict OEM dimensional tolerances (OEM Size) for a perfect fit in Yanmar 4D92E and 4TNE92 engine blocks.
• Durable Construction: Built from high-grade materials to withstand extreme combustion pressures, temperatures, and friction, ensuring a long service life.
• Direct Replacement: Designed as a drop-in replacement for the original Yanmar piston (Part #129904-22120), simplifying the installation process during engine rebuilds.
• Enhanced Performance: Contributes to optimal compression ratios, efficient fuel combustion, and reduced oil consumption, helping to restore engine power and efficiency.
• Versatile Application: Suitable for a broad spectrum of industrial sectors including construction, agriculture, marine, and power generation, making it a versatile stock item for workshops.
• Rigorous Testing: Each piston undergoes strict quality control checks, with machinery test reports and video outgoing inspection available to verify quality standards.

Technical Specifications

OEM Cross-Reference

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

• Yanmar OEM Number: 129904-22120

Please verify your engine’s specific model variant (4D92E or 4TNE92) to ensure compatibility. This is the standard size piston; oversize variants are sold separately if required for rebored cylinders.

Compatibility

This piston is specifically designed for use in the following Yanmar diesel engine models:

• Yanmar 4D92E
• Yanmar 4TNE92

These engines are commonly used for powering a variety of equipment, including:

• Construction Machinery (e.g., mini excavators, compact loaders)
• Industrial Equipment
• Agricultural Tractors and Implements
• Generator Sets (Gensets)
• Marine Propulsion Systems
• Material Handling Equipment (e.g., forklifts)

Note: While this part is designed for the listed engine models, we recommend confirming your specific engine serial number and piston size grade before purchase to guarantee a perfect fit.

Global Supply & Distribution

We are an experienced exporter of heavy-duty engine parts, serving a global B2B clientele. Our logistics network ensures fast and reliable delivery to major ports and industrial hubs worldwide.

• Major Markets Served: North America, Europe, Southeast Asia, Middle East, Africa, and Oceania.
• Shipping Options: We offer flexible shipping solutions including express couriers (DHL, FedEx, UPS) for urgent orders, air freight for medium-sized shipments, and sea freight for bulk container orders.
• Lead Times: Orders are processed and dispatched within 24-48 hours of payment confirmation. Typical transit times are 3-7 days for express, 7-15 days for air freight, and 20-40 days for sea freight, depending on the destination.
• Trade Compliance: All shipments are professionally packed with proper documentation for smooth customs clearance.

Quality Assurance

We are committed to providing parts that meet or exceed industry standards. Our quality assurance process includes:

• Manufacturing Standards: Components are manufactured in ISO-certified facilities in Guangdong, China, using modern production techniques.
• Testing: A Machinery Test Report is provided with each order to confirm dimensional and performance specifications.
• Inspection: Video Outgoing Inspection is available upon request, allowing you to visually verify the product before shipment.
• Warranty: We offer a 6-month warranty against manufacturing defects. After-warranty service includes online technical support to assist with any fitment or performance inquiries.

FAQ

Q1: Is this piston a direct fit for my Yanmar 4TNE92 engine, or do I need additional parts?
A: This piston (129904-22120) is designed as a direct replacement for the standard OEM part in 4TNE92 and 4D92E engines. However, during an engine rebuild, it is highly recommended to also replace the piston rings, piston pin, and cylinder liner (if applicable) to ensure optimal performance and longevity. Please check your engine’s service manual for the complete overhaul kit requirements.

Q2: How can I confirm if this is the correct piston size for my engine rebuild?
A: This listing is for the standard “OEM Size” piston. If your engine cylinder bore has been honed or rebored, you may require an oversize piston (e.g., 0.50mm or 1.00mm oversize). Please measure your cylinder bore diameter with a micrometer and compare it to the service manual specifications for the 4D92E/4TNE92 engine to determine if a standard or oversize piston is needed.

Q3: What is the recommended installation procedure for this piston?
A: Installation should be performed by a qualified diesel mechanic. Key steps include: 1) Carefully clean the piston and cylinder bore. 2) Install the piston rings using a ring expander tool, ensuring correct ring orientation. 3) Lubricate the piston skirt and rings with clean engine oil. 4) Use a piston ring compressor to install the piston into the cylinder bore, guiding the connecting rod onto the crankshaft journal. Always refer to the Yanmar service manual for specific torque values and procedures.