4TNV94 4TNV98 Main Bearing & Con Rod Bearing for Yanmar MAHLE 729900-02801 129900-23601

Product Details

Product Overview

This listing offers a matched set of premium Main Bearings and Connecting Rod Bearings specifically designed for the Yanmar 4TNV94 and 4TNV98 diesel engine series. These critical engine components, manufactured under the renowned MAHLE brand (OEM reference numbers 729900-02801 and 129900-23601), are essential for ensuring precise crankshaft and connecting rod alignment.

Commonly utilized in heavy machinery such as the Volvo EC55 excavator and other compact construction equipment, these bearings are manufactured to original equipment specifications. They provide the necessary oil clearance and load-bearing capacity for reliable engine performance. Please verify your engine block code and existing bearing part numbers to confirm fitment for your specific application.

Key Features & Benefits

• OEM-Grade Precision: Manufactured to the exact dimensional tolerances required for Yanmar 4TNV94 and 4TNV98 engines, ensuring proper oil clearance and reduced friction.
• High Load Capacity: Designed to withstand the high compressive forces and rotational stresses of diesel combustion cycles, extending engine overhaul intervals.
• Corrosion & Wear Resistance: Features advanced aluminum or copper-lead overlay materials that resist pitting, scuffing, and corrosion from oil contaminants.
• Direct Fit Replacement: Supplied as a complete set for both main and con rod positions, simplifying your engine rebuild or bearing replacement project.
• Comprehensive Warranty: Includes a 3-month warranty against manufacturing defects, with online technical support available after the warranty period.

Technical Specifications

OEM Cross-Reference

This bearing set replaces the following genuine Yanmar and MAHLE part numbers:

• Yanmar OEM: 729900-02801 (Main Bearing), 129900-23601 (Con Rod Bearing)
• MAHLE Part No: Refer to manufacturer stamp on bearing shells for exact MAHLE production code.
• Compatible With: Standard bearing sizes for 4TNV94 (94mm bore) and 4TNV98 (98mm bore) engine blocks. For undersized (0.25mm/0.50mm) or oversized bearings, please contact us for specific availability.

Compatibility

This bearing set is commonly used for the following engine and machinery applications:

• Engine Models: Yanmar 4TNV94, Yanmar 4TNV98
• Excavator Models: Volvo EC55, Yanmar Vio55, and other compact excavators using these engine platforms.
• Other Applications: Agricultural tractors, generator sets, and industrial pumps powered by Yanmar TNV series engines.
• Note: Fitment is inferred based on engine model. Always verify your engine serial number and existing bearing dimensions before purchase.

Global Supply & Distribution

We maintain a robust global supply chain from our distribution hub in Shanghai, China. Our inventory of MAHLE bearings is available for immediate dispatch to international markets:

• North America: Rapid delivery to major ports (Los Angeles, New York, Vancouver) and industrial centers (Houston, Chicago, Toronto).
• Europe: Regular shipments to Rotterdam, Hamburg, and Antwerp for distribution across the EU and UK.
• Asia-Pacific: Direct logistics to Singapore, Tokyo, Sydney, and Dubai for Middle East transshipment.
• Export Compliance: All orders are processed with full customs documentation, including commercial invoices and packing lists, to ensure smooth international trade.

Quality Assurance

Each bearing set is sourced directly from MAHLE-authorized supply chains and undergoes strict quality control procedures. Key quality points include:

• Manufacturing Standard: ISO 9001 certified production facilities.
• Material Certification: Bearings are made from high-grade steel backing with lead-bronze or aluminum alloy lining layers.
• Inspection: Visual inspection for surface defects and dimensional checks using calibrated micrometers.
• Warranty: 3-month warranty against manufacturing defects. After-sales service includes online technical support for installation queries.

FAQ

Q1: How do I verify that these bearings will fit my Yanmar 4TNV94 engine?

You must check the stamp on your existing bearing shells. Look for the part number (e.g., 729900-02801 for main bearings) and the size grade (standard, 0.25 undersize, etc.). If your engine has been previously rebuilt, it may require undersized bearings. Measure your crankshaft journal diameter with a micrometer to confirm.

Q2: Do I need to replace main bearings and con rod bearings at the same time?

Yes, it is strongly recommended to replace both sets simultaneously during an engine rebuild. This ensures uniform oil clearance and load distribution across all rotating assemblies. Replacing only one set can lead to uneven wear and premature bearing failure.

Q3: What is the correct installation procedure for these bearings?

Ensure the bearing housing and crankshaft journals are clean and free of burrs. Apply clean engine oil to the bearing surface before installation. Tighten main bearing caps and connecting rod bolts to the manufacturer’s specified torque settings using a calibrated torque wrench. Always check bearing clearance using Plastigage to confirm proper fit before final assembly.