K4N Main Bearing and Connecting Rod Bearing MM438664 MM438671 for Mitsubishi Diesel Engine Parts

Product Details

Product Overview

This premium engine bearing set is specifically designed for the Mitsubishi K4N diesel engine, a power unit commonly found in a wide range of industrial, construction, and agricultural machinery. The set includes both main bearings and connecting rod bearings, identified by the critical OEM part numbers MM438664 and MM438671.

Manufactured to meet OEM size specifications, these bearings are essential for maintaining proper crankshaft and connecting rod clearances, ensuring optimal oil film thickness, and preventing metal-to-metal contact within the engine. As a direct replacement part, this bearing set is a core component for any K4N engine overhaul or repair, providing the precision fit required for reliable long-term operation.

Whether you are rebuilding a genset engine or servicing a forklift, having the correct bearing set (MM438664/MM438671) is critical for engine longevity. This product offers a reliable solution for workshop professionals and equipment owners looking to restore engine performance to factory standards.

Key Features & Benefits

• Precise OEM Fitment: Manufactured to the exact OEM size specifications for the Mitsubishi K4N engine, ensuring a proper and secure fit without the need for modifications.
• Critical Part Numbers: Directly cross-references to OEM part numbers MM438664 (Main Bearing) and MM438671 (Connecting Rod Bearing), simplifying identification and ordering.
• Complete Set: Includes both main and connecting rod bearings, providing everything needed for a full crankshaft bearing replacement in one convenient package.
• Durable Construction: Built from high-strength materials designed to withstand the high loads and temperatures of a diesel engine, reducing wear and extending engine life.
• Reliable Performance: Ensures proper oil clearance and lubrication, preventing engine knock, reducing friction, and maintaining consistent oil pressure.
• Versatile Application: Suitable for a variety of equipment types including construction, agriculture, gensets, marine, and material handling machinery powered by the K4N engine.

Technical Specifications

OEM Cross-Reference

This bearing set is a direct replacement for the following genuine Mitsubishi part numbers. Please verify your engine’s requirements before ordering.

• Main Bearing: MM438664
• Connecting Rod Bearing: MM438671

Note: These numbers are the primary identifiers for the K4N engine bearing set. Always confirm the part number on your original bearing or your engine’s service manual to ensure compatibility.

Compatibility

This bearing set is specifically designed for the Mitsubishi K4N diesel engine. This engine is commonly used for powering a variety of equipment, including:

• Construction Machinery: Mini excavators, skid steer loaders, and compactors.
• Industrial Equipment: Forklifts, generators (gensets), and air compressors.
• Agricultural Machinery: Tractors, harvesters, and sprayers.
• Marine Applications: Auxiliary power units and small vessel propulsion.
• Material Handling: Reach stackers and telehandlers.

Important Fitment Note: This product is designed for the Mitsubishi K4N engine model. Please verify your engine model and the physical condition of your crankshaft before purchasing. If your crankshaft has been reground, you may require undersized bearings.

Global Supply & Distribution

We provide reliable worldwide shipping for this Mitsubishi K4N bearing set. Our logistics network ensures fast and secure delivery to major industrial centers and ports across the globe.

• North America: Regular shipments to the USA, Canada, and Mexico.
• Europe: Fast delivery to the UK, Germany, France, Netherlands, and other EU nations.
• Asia-Pacific: Efficient distribution to Australia, New Zealand, Japan, South Korea, and Southeast Asia.
• Middle East & Africa: Servicing major markets like UAE, Saudi Arabia, South Africa, and Nigeria.
• South America: Supply to Brazil, Argentina, Chile, and Colombia.

We have extensive experience in international trade and export documentation, ensuring a smooth transaction for B2B buyers, distributors, and workshops worldwide.

Quality Assurance

Quality is our priority. Each bearing set undergoes rigorous inspection to ensure it meets the high standards required for diesel engine applications.

• Manufactured under strict quality control processes in ISO-compliant facilities.
• All parts are inspected for dimensional accuracy, material composition, and surface finish.
• Machinery Test Reports and Video Outgoing Inspection are available upon request.
• Backed by a standard 6-month warranty against manufacturing defects.

FAQ

Q: How do I confirm that this bearing set (MM438664 & MM438671) fits my engine?
A: The most reliable method is to check the part numbers stamped on your existing bearings. If they match MM438664 (Main) and MM438671 (Rod), they are the correct parts for your Mitsubishi K4N engine. You can also consult your engine’s service manual or parts catalog to verify the engine model and bearing specification.

Q: What is the difference between standard size and undersize bearings? Which one do I need?
A: Standard size bearings (like the ones listed here) are for a crankshaft that has not been machined or reground. If your crankshaft journals are worn or damaged and have been machined down to a smaller diameter (e.g., 0.25mm or 0.50mm undersize), you must use the corresponding undersize bearings. Always have your crankshaft measured by a professional machinist to determine if standard or undersize bearings are required.

Q: What is the recommended installation procedure for these bearings?
A: Installation should be performed by a qualified diesel mechanic. Key steps include: 1) Thoroughly cleaning the bearing housing and the crankshaft journals. 2) Applying clean engine oil to the bearing surfaces before assembly. 3) Ensuring the bearing locking tabs are correctly seated in the grooves of the rod and main caps. 4) Torquing all bolts to the manufacturer’s specified values using a calibrated torque wrench. Incorrect installation can lead to rapid bearing failure and engine damage.