Mitsubishi K3D K4D Engine Piston Ring Set MM406600 MM433050 for Excavator Loader

Product Details

Product Overview

This high-quality piston ring set is specifically designed for Mitsubishi K3D and K4D series diesel engines, offering a direct replacement for OEM part numbers MM406600 and MM433050. As a critical component within the engine’s power cylinder group, these piston rings ensure optimal compression, oil control, and heat transfer, directly impacting engine performance and longevity.

Commonly utilized in heavy-duty applications such as excavators, loaders, bulldozers, forklifts, and buses, this piston ring set is manufactured to OEM size specifications. It is an ideal solution for engine overhaul or rebuild projects, providing the necessary sealing integrity for Mitsubishi-powered machinery operating under demanding conditions.

Key Features & Benefits

• Precision Fitment: Manufactured to OEM size standards (MM406600 & MM433050) to ensure a perfect seal within the cylinder bore for K3D and K4D engine blocks.
• Enhanced Durability: Constructed from high-grade alloy cast iron, offering excellent wear resistance and thermal stability against the high pressures of diesel combustion.
• Optimized Oil Control: The ring pack design includes specialized oil rings that minimize oil consumption while maintaining proper cylinder wall lubrication.
• Improved Compression: Ensures maximum compression pressure, leading to better fuel efficiency, reduced blow-by, and increased engine power output.
• Rigorous Quality Control: Each set undergoes dimensional inspection and tensile strength testing. Video outgoing inspection and machinery test reports are available upon request.
• Complete Set: Includes all necessary compression rings and oil rings for a single piston, simplifying the ordering process for engine rebuilders.

Technical Specifications

OEM Cross-Reference

This piston ring set is a direct replacement for the following original Mitsubishi part numbers:

• MM406600 (Primary Part Number)
• MM433050 (Alternative Part Number)

Note: These numbers correspond to the piston ring set for the K3D and K4D engine families. Always verify your engine block serial number to ensure compatibility.

Compatibility

This product is commonly used for engine overhaul and repair in the following applications:

• Engine Models: Mitsubishi K3D, K4D
• Equipment Types: Excavators, Bulldozers, Wheel Loaders, Forklifts, Trucks, and Buses.
• Typical Machinery: Commonly found in Mitsubishi heavy equipment and industrial vehicles where these engine platforms are deployed.

Disclaimer: This is an aftermarket replacement part. Fitment is based on the engine model listed. Please confirm your specific engine model and part number before purchase.

Global Supply & Distribution

We offer worldwide shipping capabilities to support international B2B clients, including parts distributors, repair shops, and fleet operators. Our logistics network ensures fast and reliable delivery to major industrial centers and ports across North America, Europe, the Middle East, Southeast Asia, and Australia.

With extensive export experience, we handle international trade compliance, including customs documentation and shipping insurance. Whether you require air freight for urgent maintenance or sea freight for bulk stock orders, we can accommodate your delivery schedule to minimize downtime for your equipment.

Quality Assurance

Our manufacturing process adheres to strict quality control standards. Each piston ring set is produced using precision grinding and finishing techniques to meet OEM dimensional tolerances. We provide:

• Certifications: Compliance with international quality management standards.
• Testing: Dimensional verification, tensile strength testing, and surface finish inspection.
• Warranty: 6-month warranty against manufacturing defects in material and workmanship.
• Documentation: Machinery test reports and video outgoing inspection available for qualified buyers.

FAQ

Q1: How do I confirm these piston rings fit my specific engine?
A: Please verify the engine model stamped on your engine block (K3D or K4D) and compare it to the OEM part numbers (MM406600 or MM433050) currently installed. If your existing rings have a different number, please contact us with your engine serial number for cross-referencing.

Q2: What is included in the piston ring set?
A: The set includes the complete ring pack for one piston, typically consisting of two compression rings (top and second) and one oil control ring assembly. If you are rebuilding a multi-cylinder K4D engine, you will need four sets.

Q3: Do I need to perform any special break-in procedure after installation?
A: Yes. After installing new piston rings, proper break-in is critical. Follow the engine manufacturer’s recommended procedure, which generally involves running the engine under varying loads (not constant idle) for the first hour to seat the rings against the cylinder wall. Use the recommended grade of diesel engine oil and avoid high RPM operation initially.