MM433462 MM438918 Piston Assy W/ Wrist Pin & Clips STD Size for Mitsubishi K3E K4E Engine Bobcat

Product Details

Product Overview

This is a high-quality aftermarket piston assembly (Part Numbers: MM433462, MM438918) designed for the Mitsubishi K3E and K4E diesel engines. This kit is a critical component for engine rebuilds and overhauls, commonly used in compact construction equipment such as the Bobcat 322 and 323 mini excavators, as well as compact tractors and generator sets.

The assembly includes the piston, wrist pin, and retaining snap rings for a single cylinder. It is supplied in Standard (STD) size with a bore diameter of 76.00 mm, ensuring a precise fit for standard cylinder bores. This component is essential for restoring compression, reducing oil consumption, and maximizing engine power output.

As a 100% brand new aftermarket part, this piston assembly offers a reliable and cost-effective alternative to OEM components without compromising on performance or durability.

Key Features & Benefits

• Precision Engineering: Manufactured to meet or exceed OEM specifications for the Mitsubishi K3E and K4E engines, ensuring a perfect fit and reliable operation.
• High-Strength Material: Constructed from high-strength aluminum alloy, providing excellent thermal conductivity, reduced weight, and superior durability under high combustion pressures.
• Complete Kit: Each assembly includes the piston, wrist pin, and two snap rings, simplifying the ordering process and ensuring all necessary components are matched for a single cylinder.
• Standard Size Fitment: This STD (Standard) size piston is ideal for engines that have not been previously overbored, allowing for direct replacement without additional machining.
• Enhanced Engine Performance: Restores proper cylinder compression and reduces blow-by, leading to improved fuel efficiency, lower emissions, and increased horsepower.
• Rigorous Quality Control: Each batch undergoes outgoing inspection with video documentation and machinery test reports available upon request, confirming dimensional accuracy and material integrity.

Technical Specifications

OEM Cross-Reference

This piston assembly is a direct replacement for the following OEM part numbers:

• Mitsubishi: MM433462, MM438918

Note: Always verify the OEM part number on your original component before purchase to ensure compatibility.

Compatibility

This piston assembly is specifically designed for use in the following equipment and engines:

• Engine Models: Mitsubishi K3E, Mitsubishi K4E
• Common Applications:
  • Bobcat 322 Mini Excavator
  • Bobcat 323 Mini Excavator
  • Various Compact Tractors
  • Generator Sets powered by K3E/K4E engines

Important Fitment Note: While this part is commonly used for the listed applications, we recommend confirming your specific engine model and cylinder bore condition before ordering. This is a standard-size piston and will not fit overbored cylinders without the correct oversize piston.

Global Supply & Distribution

As a specialized supplier based in Guangdong, China, we offer efficient worldwide shipping to meet the demands of the international B2B market. Our logistics network ensures fast and reliable delivery to major industrial centers and ports across:

• North America: Los Angeles, Houston, Chicago, Toronto
• Europe: Rotterdam, Hamburg, Antwerp, Felixstowe
• Asia-Pacific: Singapore, Sydney, Tokyo, Busan
• Middle East & Africa: Dubai, Jeddah, Durban
• South America: Santos, Buenos Aires, Callao

We have extensive experience in export documentation and international trade compliance, ensuring a smooth transaction for importers, distributors, and workshops worldwide.

Quality Assurance

We are committed to providing high-quality aftermarket components that meet rigorous standards:

• Manufacturing Standards: Parts are produced using precision casting and machining processes in ISO-compliant facilities.
• Testing: Each production batch is subject to dimensional inspection and material verification. Video outgoing inspection and machinery test reports are available upon request for quality verification.
• Warranty: This product is backed by a comprehensive warranty period of 6 to 12 months against manufacturing defects.

FAQ

Q1: Is this piston assembly compatible with an overbored engine?
A: No, this specific part (MM433462/MM438918) is the Standard (STD) size with a bore diameter of 76.00 mm. It is designed for original cylinder bores that have not been machined oversize. If your engine block has been overbored, you will require a corresponding oversize piston (e.g., 0.25mm, 0.50mm). Always measure your cylinder bore before ordering.

Q2: What is included in the “piston assembly”?
A: The kit includes one piston, one wrist pin, and two snap rings (circlips) for a single cylinder. You will need to purchase the correct number of assemblies for your engine (3 for a K3E engine, 4 for a K4E engine). Piston rings are sold separately unless specified otherwise.

Q3: How do I verify if this part fits my Bobcat 322 excavator?
A: First, confirm the engine model on your machine’s nameplate. It must be a Mitsubishi K3E or K4E. Second, check the part number on your old piston; it should be MM433462 or MM438918. If both match, this is the correct standard-size replacement. For further verification, you can also measure your cylinder bore diameter (should be 76.00 mm for STD).