Product Overview

This high-precision valve guide is engineered for Mitsubishi 4D31 and 6D31 series diesel engines, serving as a critical component for maintaining cylinder head integrity and valve train alignment. We supply this essential spare part to a global network of engine rebuilders, heavy machinery workshops, and industrial equipment distributors, with major markets across North America, Europe, the Asia-Pacific region, and the Middle East.

Key Features & Benefits

• Precision Machined: Manufactured to exact OEM specifications for a perfect press-fit into the cylinder head, ensuring optimal valve stem alignment and longevity.
• High-Temperature Durability: Constructed from premium-grade materials designed to withstand the extreme heat and friction of diesel engine operation.
• Enhanced Lubrication Retention: Surface finish and design promote proper oil retention for continuous lubrication of the valve stem, reducing wear.
• Reliable Performance: Direct replacement part that restores engine compression, prevents oil consumption, and maintains efficient engine operation.
• Cost-Effective Maintenance: Enables cost-efficient overhauls of Mitsubishi industrial and automotive engines, minimizing equipment downtime.

Technical Specifications

OEM Cross-Reference

This part serves as a direct replacement for the following OEM numbers:

• ME031886
• ME031888

Always verify the specific guide required for your engine’s intake or exhaust application prior to ordering.

Compatibility

This valve guide is specifically designed for the following applications:

• Engine Family: Mitsubishi 4D31 and 6D31 series diesel engines.
• Typical Applications: Found in a range of Mitsubishi industrial machinery, generator sets, and older model commercial vehicles utilizing these engine platforms.
• Note: Compatibility is engine-model specific. We recommend consulting your engine service manual or contacting our technical support with your engine serial number for confirmation.

Global Supply & Distribution

We are a specialized exporter of heavy-duty engine components with a robust international logistics network. Our capabilities include:

• Worldwide Shipping: Reliable export to all major industrial regions via air and sea freight.
• Key Market Access: Extensive experience supplying to North America (USA, Canada), the European Union, Australia, Southeast Asia, and the GCC countries.
• Efficient Logistics: Consolidated shipments to major ports and inland logistics hubs for faster clearance and delivery to your workshop.
• Trade Compliance: All documentation (commercial invoice, packing list, certificate of origin) is prepared to international standards for smooth customs clearance.

Quality Assurance

Every component in our supply chain is subject to a rigorous quality protocol to meet the demands of the global B2B market.

• Manufacturing Standard: Produced in ISO-certified facilities using precision tooling to ensure dimensional accuracy and material consistency.
• Inspection Process: 100% dimensional checks and batch testing for material hardness and wear resistance.
• Warranty: Backed by a standard warranty against manufacturing defects, supporting your business with reliable parts.

FAQ

Q: How do I determine if my Mitsubishi 4D31/6D31 engine needs new valve guides?
A: Common signs include excessive blue smoke from the exhaust (oil burning), loss of engine power, and increased oil consumption. A compression test or leak-down test can help diagnose worn guides. Visual inspection of the valve stems for excessive play during disassembly is the definitive method.

Q: Is special tooling required for the installation of these valve guides?
A: Yes. Proper installation requires a hydraulic or arbor press, a correctly sized driver or mandrel, and often the use of a cylinder head guide reaming tool after installation to achieve the final precise inner diameter for the valve stem. Professional engine rebuilding equipment is recommended.

Q: Do you supply these parts in bulk quantities for engine rebuild shops?
A> Absolutely. We specialize in B2B and wholesale orders. We offer competitive pricing on palletized and container quantities, with all necessary export packaging and documentation. Contact our sales team for a bulk quote and lead time.

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 .