Mitsubishi 8DC9 Diesel Engine Piston Ring Set OEM ME090758 ME062018 ME062230

Mitsubishi 8DC9 Diesel Engine Piston Ring Set | OEM ME090758 ME062018 ME062230 | Engine Piston Ring
Rebuild or overhaul your excavator, heavy truck, or industrial equipment with this high-quality piston ring set for the Mitsubishi 8DC9 diesel engine. Piston rings are critical components that seal the combustion chamber, control oil consumption, and transfer heat from the piston to the cylinder wall. Manufactured to meet or exceed original OEM specifications, this piston ring set ensures proper compression, reduced blow-by, and long-term durability in demanding applications. Direct replacement for multiple OEM numbers including ME090758, ME062018, ME062230, and related variants. Fits a wide range of Mitsubishi-powered excavators and heavy equipment – verify your engine model and serial number for compatibility.

Technical Specifications

Compatible Equipment & Applications

Product Features & Engineering Advantages
✅ Critical Component for Engine Performance
Piston rings serve three essential functions: sealing the combustion chamber to maximize compression, regulating oil consumption by controlling lubricant flow, and transferring heat from the piston to the cylinder wall for proper cooling. High-quality rings are essential for maintaining engine power and efficiency in heavy-duty excavator and truck applications.
✅ Precision-Engineered for Mitsubishi 8DC9 Engine
Specifically designed for the 135mm bore of the Mitsubishi 8DC9 engine platform, this ring set matches factory specifications for ring width, gap, and tension. Proper fit ensures optimal sealing across all operating conditions encountered in demanding industrial environments.
✅ Four-Ring Design with Specific Profiles
Each piston requires four rings: three compression rings designed to withstand highest combustion pressures and a multi-piece oil ring that regulates oil film thickness on the cylinder wall. Ring dimensions are precisely manufactured to 3.306 mm, 3.0 mm, 3.0 mm, and 4.0 mm specifications for the 8DC9 engine.
✅ High-Grade Alloy Steel Construction
Manufactured from high-grade alloy steel with superior tensile strength and exceptional resistance to wear and thermal stress. This material ensures dimensional stability even under prolonged exposure to high combustion temperatures, critical for maintaining compression and preventing blow-by in demanding operating conditions.
✅ Advanced Oil Control Ring Design
Equipped with a two-piece oil control ring design and integrated spacer expander that efficiently regulates lubricant distribution along the cylinder walls. This design prevents excess oil from entering the combustion chamber, minimizing carbon buildup, reducing emissions, and preventing blue smoke.
✅ Heat Treatment for Extended Durability
All rings undergo a controlled heat treatment process, including surface hardening techniques such as induction hardening or nitriding. This enhances surface durability, reduces friction, and prevents micro-cracking due to thermal cycling.
✅ Rigorous Quality Testing
Manufactured to ISO 9001 and TS16949 standards, ensuring consistent quality across all units. Every ring set meets dimensional specifications for gap, width, and tension with precision tolerance.
✅ OEM-Equivalent Performance
Manufactured to meet or exceed original Mitsubishi specifications, ensuring perfect compatibility with 8DC9 engine components including pistons, cylinder bores, and ring grooves. Available with OEM numbers ME090758, ME062018, and ME062230 for guaranteed fit and function.

Quality Assurance & Why Choose Us

• 100% Inspected – Every ring set undergoes dimensional inspection for proper gap, width, and tension before shipment.

• OEM Standard – Manufactured to meet or exceed original Mitsubishi specifications in ISO-certified facilities.

• Warranty – 6-month warranty against manufacturing defects.

• Global Shipping – Fast DHL, FedEx, UPS shipping available from multiple warehouses.

• Expert Support – Need help identifying the correct piston ring set for your engine? Send us your engine serial number or old part number.

Installation Note (Technical Reference)
Piston rings are precision components that require careful installation. When installing new piston rings on a Mitsubishi 8DC9 engine, follow these critical guidelines:

1. Always verify correct ring set based on engine serial number and cylinder bore size.

2. Thoroughly clean ring grooves of piston before installation.

3. Fit oil control ring first, followed by compression rings in ascending order into the ring grooves using a proper ring expander tool.

4. Ensure rings are fitted with marked faces upward and toward top of the piston.

5. After installation, make sure rings can be moved freely without jamming in the piston grooves.

6. Ensure each ring gap is not positioned in line with piston pin axis or thrust direction – stagger gaps according to factory specifications.

7. Always use an installation tool when inserting piston into cylinder.

8. Professional installation is recommended due to the precision required for proper ring seating and engine break-in.

Warning: Never install new rings without deglazing cylinder bores. Improper ring seating can cause excessive oil consumption, blow-by, and premature engine failure. Always follow factory break-in procedures after ring replacement.

Ordering Information