3TNM72 Eccentric Shaft for Yanmar Engine Parts | Excavator & Diesel

Product Details

Product Overview

This high-precision 3TNM72 Eccentric Shaft is a critical rotating component designed specifically for Yanmar diesel engines, particularly the 3TNM72 and related 3TNV72 series. As a core part of the engine’s valvetrain and fuel injection timing mechanism, this eccentric shaft ensures precise rotational movement is converted into the linear motion required for optimal engine performance. Commonly used in industrial and construction equipment, this component is essential for maintaining the operational integrity of excavators, loaders, and other heavy machinery.

Manufactured to OEM size specifications, this replacement eccentric shaft offers a reliable solution for engine rebuilds and repairs. It is a direct-fit component for Yanmar engine blocks requiring this specific part, providing the necessary durability and dimensional accuracy to restore engine function. Please verify your engine model and serial number to ensure compatibility with this 3TNM72 variant before installation.

Key Features & Benefits

• OEM Specification Fitment: Machined to the exact OEM size and tolerances for the Yanmar 3TNM72 engine, ensuring a seamless drop-in replacement without modification.
• Durable Construction: Manufactured from high-strength alloy steel, this eccentric shaft is built to withstand the high cyclic loads and torsional stresses within a diesel engine.
• Enhanced Timing Precision: The precise eccentric profile ensures accurate fuel injection and valve timing, which is critical for engine efficiency, power output, and reduced emissions.
• Corrosion & Wear Resistance: Surface treatment provides excellent resistance to wear and corrosion, extending the service life of the component in demanding operational environments.
• Rigorous Quality Control: Each shaft undergoes strict dimensional inspection and a machinery test report is provided, confirming it meets performance standards before shipping.
• Cost-Effective Solution: Offers a factory-direct price advantage without compromising on quality, providing significant savings compared to genuine OEM parts.

Technical Specifications

OEM Cross-Reference

This eccentric shaft is a direct aftermarket replacement for Yanmar OEM parts. While the specific OEM part number for the 3TNM72 eccentric shaft may vary by engine serial number, this component is designed to match the original manufacturer’s specifications. Please cross-reference your OEM part number for confirmation.

• OEM Reference: Yanmar 3TNM72 Series Eccentric Shaft
• Related Models: 3TNV72, 3TNV76, 3TNV80

Note: If you have a specific OEM number (e.g., 119250-xxxxx), please contact our sales team for direct cross-reference verification.

Compatibility

This eccentric shaft is specifically designed for the Yanmar 3TNM72 diesel engine. It is commonly used for the following applications where this engine platform is installed:

• Engine Models: Yanmar 3TNM72, 3TNV72, 3TNV76
• Vehicle/Equipment Applications: Excavators, Forklifts, Bulldozers, Loaders, Trucks, Buses, and other industrial machinery.

Global Supply & Distribution

We maintain a robust global distribution network to serve B2B clients across all major industrial markets. Our logistics capabilities ensure fast and reliable delivery to key destinations:

• Asia-Pacific: Direct shipping to major ports including Shanghai, Singapore, and Busan.
• North America: Expedited shipping to Los Angeles, Houston, New York, and Toronto.
• Europe: Fast delivery to Rotterdam, Hamburg, Antwerp, and Felixstowe.
• Middle East & Africa: Reliable service to Dubai, Jeddah, and Durban.
• South America: Efficient shipping to Santos, Buenos Aires, and Callao.

We handle all export documentation and international trade compliance, making cross-border procurement simple for our partners.

Quality Assurance

Our manufacturing process adheres to strict quality control standards. Every eccentric shaft is produced in ISO-certified facilities located in Guangdong and Guizhou, China.

• Testing: Each unit undergoes a Machinery Test Report to verify dimensional accuracy and material integrity.
• Inspection: Video Outgoing Inspection is provided upon request, allowing you to visually verify the product before shipment.
• Warranty: We offer a 6-month warranty against manufacturing defects, providing peace of mind for your procurement.

FAQ

Q1: How can I confirm this 3TNM72 eccentric shaft is the correct fit for my engine?
A: Please verify your engine’s model number, stamped on the engine block. This part is specifically for the Yanmar 3TNM72 diesel. Also, cross-reference the dimensions of your old shaft (total length, journal diameter, and eccentric throw) with the specifications listed. If you have an OEM part number, provide it to our support team for a definitive compatibility check.

Q2: What is the installation procedure for this eccentric shaft?
A: Installation should be performed by a qualified diesel mechanic. The process generally involves: 1) Removing the gear case cover and timing gears. 2) Carefully extracting the old eccentric shaft. 3) Lubricating the new shaft journals with clean engine oil. 4) Pressing the new shaft into the block. 5) Reassembling the timing gears and setting the engine timing to the manufacturer’s specifications. A service manual for the 3TNM72 is highly recommended for specific torque values and timing marks.

Q3: What are common signs of a worn eccentric shaft?
A: A failing eccentric shaft can cause erratic engine idling, hard starting, loss of power, and unusual knocking sounds from the timing gear area. In severe cases, it can lead to incorrect fuel injection timing, causing excessive smoke and reduced fuel economy. Regular inspection during major engine overhauls is advised to prevent catastrophic engine damage.