3TNV70 Main Bearing & Connecting Rod Bearing 0.25 Oversize for Yanmar Engine Parts

Product Details

Product Overview

This set of main bearings and connecting rod bearings is specifically designed for the Yanmar 3TNV70 diesel engine. These bearings are manufactured to OEM size standards and are offered in a 0.25 oversize, making them ideal for engine rebuilds where the crankshaft has been ground down to the first undersize. The set includes both main bearing shells and connecting rod bearing shells, ensuring a comprehensive solution for your engine overhaul needs.

As critical components in the rotating assembly, these bearings provide the necessary oil clearance and surface durability to support the crankshaft and connecting rods. The 0.25 oversize dimension allows for a precise fit after machining the crankshaft journals, restoring proper tolerances and extending the service life of the engine. This product is commonly used in a variety of industrial and agricultural equipment powered by the Yanmar 3TNV70 engine, including excavators, forklifts, and generators.

Key Features & Benefits

• Oversize Fitment: The 0.25 oversize (0.010 inches) is specifically designed for crankshafts that have been reground to the first undersize, ensuring a precise and reliable fit.
• Complete Set: Includes both main bearing shells and connecting rod bearing shells for a single, convenient replacement package.
• OEM Standard Dimensions: Manufactured to match the original Yanmar 3TNV70 specifications, providing confidence in fitment and performance.
• Durable Material: Constructed from high-strength bearing material designed to withstand the high loads and operating temperatures of diesel engines.
• Cost-Effective Rebuild Solution: An economical alternative to purchasing individual bearings, offering a complete solution for a major engine overhaul.
• Lowest Price Advantage: Direct from the manufacturer, we offer competitive pricing without compromising on quality.

Technical Specifications

OEM Cross-Reference

This bearing set is designed as a direct replacement for the original Yanmar 3TNV70 engine bearings. While specific OEM part numbers may vary by engine serial number, this set corresponds to the standard main and rod bearing sizes for the 3TNV70 platform. The 0.25 oversize indicates compatibility with crankshafts reground to the first undersize.

Cross-Reference Notes:

• Compatible with Yanmar 3TNV70 service parts for engine overhaul
• Suitable for use with OEM standard crankshaft grinding specifications
• Commonly used as a replacement for original equipment bearings in the 3TNV70 series

Compatibility

This product is specifically designed for the Yanmar 3TNV70 diesel engine. Based on the engine model, it is commonly used for the following applications:

• Excavators: Mini and compact excavators
• Forklifts: Industrial forklifts
• Loaders: Small wheel loaders and skid steer loaders
• Agricultural Equipment: Tractors and farm machinery
• Construction Equipment: Bulldozers and compactors
• Industrial Engines: Generators, pumps, and other stationary equipment

Note: Fitment is inferred based on the engine model. Always verify compatibility with your specific engine serial number and crankshaft journal dimensions before installation.

Global Supply & Distribution

We maintain a robust global supply chain to ensure fast and reliable delivery to customers worldwide. Our export capabilities cover all major markets, including:

• North America: USA, Canada, Mexico – shipped via air or sea to major ports like Los Angeles, Houston, and Vancouver.
• Europe: Germany, UK, Netherlands, France – delivery to Rotterdam, Hamburg, and Felixstowe.
• Asia-Pacific: Australia, Japan, South Korea, Singapore – express shipping to Sydney, Tokyo, and Singapore.
• Middle East & Africa: UAE, Saudi Arabia, South Africa – fast delivery to Dubai, Jeddah, and Durban.
• South America: Brazil, Argentina, Chile – shipping to Santos, Buenos Aires, and Valparaíso.

We offer flexible shipping options including FOB, CIF, and DDP terms. Our logistics team ensures proper packaging for international transit to prevent damage during transport.

Quality Assurance

Each bearing set undergoes rigorous quality control procedures to ensure dimensional accuracy and material integrity. Our manufacturing process includes:

• Material Verification: Raw materials are tested for hardness, tensile strength, and chemical composition.
• Dimensional Inspection: Each bearing shell is measured for wall thickness, bore diameter, and width to ensure precise fitment.
• Surface Finish: The bearing surfaces are inspected for smoothness and proper oil groove geometry.
• Video Outgoing Inspection: We provide video evidence of the final inspection process for your confidence.
• Machinery Test Report: A comprehensive test report is available upon request, detailing all quality checks performed.

All products come with a 6-month warranty against manufacturing defects. In the unlikely event of a defect, we offer a replacement or refund.

FAQ

Q: How do I know if I need a 0.25 oversize bearing for my Yanmar 3TNV70 engine?

A: The 0.25 oversize bearing is required when the crankshaft journals have been ground down to the first undersize (0.25mm or 0.010 inches). This is typically done during an engine rebuild to remove scoring or wear. You should measure the crankshaft journal diameter after grinding and compare it to the OEM specification. If the journal diameter is 0.25mm smaller than standard, these bearings are the correct choice.

Q: Can these bearings be installed without removing the engine from the equipment?

A: No. Replacing main bearings and connecting rod bearings requires complete disassembly of the engine. The engine must be removed from the equipment, and the crankshaft must be removed to access the main bearing saddles. This is a major engine overhaul procedure that should be performed by a qualified diesel mechanic. We recommend having the crankshaft measured and ground by a professional machine shop before ordering these oversize bearings.

Q: What is the difference between main bearings and connecting rod bearings in this set?

A: Main bearings support the crankshaft within the engine block and are larger, while connecting rod bearings fit between the connecting rod and the crankshaft journal. This set includes both types, ensuring a complete replacement. The main bearings are typically split into upper and lower halves, while the connecting rod bearings are also split. Always follow the manufacturer’s torque specifications and assembly procedures when installing these bearings.