Product Overview

This is a premium piston ring set manufactured by RIK, a leading Japanese OEM supplier, designed for the critical rebuild of Mitsubishi 6D31 and 4D31 series diesel engines. Engineered to restore original compression, oil control, and performance, this kit is essential for professional engine overhauls in construction and industrial machinery. We supply directly to workshops, rebuilders, and distributors worldwide, with major markets including North America, Europe, the Asia-Pacific region, and the Middle East.

Key Features & Benefits

• OEM-Quality Engineering: Manufactured by RIK to exact Mitsubishi specifications, ensuring perfect fitment and optimal engine performance.
• Superior Material & Durability: Constructed from high-grade alloy steel with advanced coatings for exceptional wear resistance and extended service life under heavy-duty conditions.
• Restored Engine Efficiency: Precisely designed to restore cylinder sealing, maximizing compression, minimizing oil consumption, and reducing blow-by gases.
• Reliable Rebuild Solution: A critical component for a complete and reliable engine overhaul, helping to avoid costly repeat failures and downtime.
• Global Supply Chain Ready: Packaged for international B2B trade, with compliance documentation for smooth import to major industrial markets.

Technical Specifications

OEM Cross-Reference

This genuine RIK piston ring set directly replaces the original Mitsubishi component. While the specific Mitsubishi part number should be verified against your engine serial number, this set is engineered for the 6D31 and 4D31 engine families. For confirmation, cross-reference with your existing RIK ring set or consult your engine’s parts manual.

Compatibility

Engine Models: Specifically designed for the Mitsubishi 6D31 and 4D31 series industrial diesel engines.

Vehicle/Machine Applications: Primarily used in various models of Mitsubishi excavators and other heavy construction equipment powered by these engine series. Always verify engine model and serial number before purchase.

Global Supply & Distribution

We are a specialist exporter of heavy-duty engine components with a robust global logistics network. We ship via air and sea freight to all major markets, ensuring reliable delivery to ports and industrial hubs across North America (USA, Canada, Mexico), Europe (UK, Germany, Netherlands, Poland), Asia-Pacific (Australia, Singapore, Japan, Indonesia), and the Middle East (UAE, Saudi Arabia, Qatar). Our expertise in international trade compliance, including documentation and certifications, facilitates smooth customs clearance for B2B clients.

Quality Assurance

Every piston ring set is sourced directly from certified RIK production channels, guaranteeing genuine OEM quality. Components undergo stringent dimensional checks and material analysis to meet original performance specifications. While specific warranty terms are provided with the commercial invoice, we stand behind the quality and fitment of all our parts. Our commitment is to provide reliable components that meet the demands of professional engine rebuilders worldwide.

FAQ

Q: How do I confirm this piston ring set is correct for my specific Mitsubishi 6D31 engine?
A: The most reliable method is to match the engine model (6D31 or 4D31) and cross-reference the part number from your engine’s official parts catalog or the original rings being replaced. You can also provide your engine serial number for our technical team to verify.

Q: Is this a complete set for one cylinder or for the entire engine?
A> This listing is for a complete piston ring set for one cylinder, which includes the compression rings and oil control ring. For a full engine rebuild, you will need one set per cylinder (e.g., 6 sets for a 6D31 engine). Please specify your quantity requirements when ordering.

Q: What are the critical steps during installation to ensure optimal performance?
A> For best results: 1) Always hone the cylinder liner to the specified surface finish and cross-hatch pattern. 2) Ensure the ring end gaps are set correctly according to the engine service manual specifications. 3) Lubricate the rings and cylinder wall thoroughly during assembly. 4) Follow the proper engine break-in procedure after rebuild.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .