Z402 Main and Connecting Rod Bearing Set – Kubota Engine Parts, Diesel Engine

Product Details

Product Overview

This high-precision Main and Connecting Rod Bearing Set is specifically designed for the Kubota Z402 diesel engine. As a critical component within the engine’s rotating assembly, these bearings ensure proper oil clearance and support for the crankshaft and connecting rods, reducing friction and preventing metal-to-metal contact. While commonly associated with Kubota applications, this bearing set is a direct replacement for engines used in a variety of compact industrial equipment.

Manufactured to OEM size specifications, this bearing set provides a reliable solution for engine rebuilds or repairs. The set includes both main bearings and connecting rod bearings, offering a complete solution for the lower end of the Z402 engine block. Please verify your engine model and bearing size requirements before installation to ensure a proper fit.

As a core component for maintaining engine health, these bearings are compatible with a wide range of machinery including forklifts, bulldozers, excavators, and loaders. This part is sourced from, a recognized brand in the aftermarket engine parts industry.

Key Features & Benefits

• Precision Engineering: Manufactured to match the exact OEM size specifications for the Kubota Z402 engine, ensuring correct oil clearance and optimal performance.
• Durable Material: Constructed from high-quality bearing material designed to withstand the high loads and pressures of diesel engine operation, extending service life.
• Complete Set: Includes both main bearings and connecting rod bearings in one package, simplifying the ordering process and ensuring component compatibility.
• Wear Resistance: Engineered to reduce friction and wear on the crankshaft journals and connecting rod pins, protecting expensive engine components.
• Rigorous Testing: Each batch undergoes a machinery test report and video outgoing inspection to verify dimensional accuracy and quality standards.
• Versatile Application: Suitable for various types of heavy equipment, making it a versatile stock item for repair shops and parts dealers.

Technical Specifications

OEM Cross-Reference

This bearing set is a direct aftermarket replacement for standard Kubota Z402 engine components. While specific OEM part numbers for bearings vary by production run, this set is designed to meet or exceed the specifications of the original equipment used in the Z402 engine block. For precise cross-referencing, please consult your engine’s service manual or remove the existing bearings to confirm size markings (e.g., STD, 0.25, 0.50).

Common reference sizes include Standard (STD) as supplied. Undersized bearings for crankshaft grinding applications are not included in this standard set unless specified.

Compatibility

This product is specifically designed for the Kubota Z402 diesel engine. This engine platform is commonly used for powering a variety of industrial and agricultural equipment. Based on the application data, these bearings are suitable for use in:

• Forklifts
• Bulldozers
• Excavators
• Loaders
• Trucks & Buses
• Other compact construction and utility machinery

Important Fitment Note: This part is commonly used for the engines listed. We strongly recommend verifying your specific engine model (Z402) and bearing size (Standard, 0.25mm, 0.50mm) before purchasing to ensure compatibility with your equipment’s crankshaft condition.

Global Supply & Distribution

We offer worldwide shipping for this Kubota Z402 bearing set, ensuring fast and reliable delivery to industrial centers across the globe. Our distribution network covers major markets including North America, Europe, Southeast Asia, the Middle East, South America, and Oceania. We have extensive experience in international trade and export logistics, handling orders of all sizes from single sets to bulk wholesale quantities. Our partnerships with major freight carriers allow us to offer competitive shipping rates to ports and airports worldwide, with standard delivery times ranging from 7-15 business days for most international destinations.

Quality Assurance

Every Main and Rod Bearing Set undergoes strict quality control procedures to guarantee performance and reliability. Our manufacturing process follows industry standards to ensure dimensional consistency and material integrity. Key quality measures include:

• Incoming Material Inspection: All raw materials are tested for composition and hardness.
• Dimensional Accuracy: Parts are measured using precision instruments to confirm they meet OEM size tolerances.
• Machinery Test Report: Provided with each batch to document production quality.
• Video Outgoing Inspection: A visual inspection is recorded to verify the final product condition before packaging.
• 6-Month Warranty: We stand behind the quality of our parts, offering a 6-month warranty against manufacturing defects.

FAQ

Q1: How do I know if I need Standard or Undersized bearings for my Kubota Z402 engine?

A: The “OEM Size” set provided here is for a standard (STD) crankshaft journal. If your crankshaft has been previously ground or is worn beyond specifications, you will need an undersized bearing (e.g., 0.25mm or 0.50mm). You must have your crankshaft measured by a machine shop to determine the exact size required. Installing standard bearings on a worn or ground crankshaft will result in improper oil clearance and potential engine failure.

Q2: Does this set include both upper and lower bearing shells for the connecting rods and main journals?

A: Yes, this set is a complete kit that includes all necessary bearing shells for a full Z402 engine rebuild. It contains both the upper and lower halves for the main bearings and the connecting rod bearings. However, we always recommend checking the contents of the package upon receipt against your engine’s requirements to confirm the correct number of shells is included.

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

A: Installation should be performed by a qualified diesel mechanic. The process involves thoroughly cleaning the bearing saddles, installing the shells dry (without grease), and applying clean engine oil to the bearing surface before assembly. It is critical to check the oil clearance using Plastigage to ensure it falls within the engine manufacturer’s specifications. All bolts must be tightened to the correct torque values using a calibrated torque wrench. Failure to follow proper procedures can lead to bearing seizure or failure.