JCB448 Diesel Engine Main Bearing & Connecting Rod Bearing 0.25 Oversize for JCB

Product Details

Product Overview

This high-precision set includes both main bearings and connecting rod bearings specifically designed for the JCB448 diesel engine. Manufactured to OEM standard dimensions with a 0.25mm oversize, these components are critical for restoring engine crankshaft clearances during rebuilds or overhauls. The JCB448 engine is commonly found in a range of heavy equipment, including JCB forklifts, excavators, and loaders.

As a direct replacement part, this bearing set ensures a precise fit and reliable performance. The 0.25 oversize specification is ideal for engines where the crankshaft has been ground down to the first undersize increment, allowing for a proper oil film clearance and extended engine life. Each bearing shell is manufactured from high-strength steel with a lead-bronze or aluminum-tin lining for superior load-bearing capacity.

Please verify your engine model (JCB448) and crankshaft journal dimensions before ordering to ensure compatibility with this 0.25mm oversize set. This product is intended for professional installation during diesel engine overhaul procedures.

Key Features & Benefits

• Precision Oversize Fit: Manufactured to a precise 0.25mm oversize specification for crankshafts ground to the first undersize dimension.
• Complete Set: Includes both main bearings and connecting rod bearings in one package, simplifying your engine rebuild parts procurement.
• OEM Standard Quality: Produced under strict quality controls to match or exceed original JCB engine specifications for durability and performance.
• Enhanced Load Capacity: Tri-metal or bi-metal bearing lining material provides excellent resistance to wear, fatigue, and corrosion under high-load diesel operation.
• Reduced Friction: Precision-machined oil grooves and chamfered edges ensure optimal oil flow and distribution for reduced friction and heat buildup.
• Extended Engine Life: Proper bearing clearance restoration prevents crankshaft damage, reduces vibration, and prolongs the service interval of your JCB engine.

Technical Specifications

OEM Cross-Reference

This bearing set is designed to replace genuine JCB part numbers for the JCB448 engine. While specific OEM numbers may vary by engine variant, the following reference numbers are commonly associated with this application:

• JCB Part Number: 320/04400 (Main Bearing Set – Reference)
• JCB Part Number: 320/04401 (Connecting Rod Bearing – Reference)
• Cross Reference: Fits Perkins 4.236 / 1004 series equivalent bearings (verify dimensions)
• Note: Always verify your specific OEM part number before ordering. Contact us with your engine serial number for confirmation.

Compatibility

This bearing set is specifically designed for the JCB448 diesel engine. This engine is commonly used for the following applications:

• JCB Equipment: JCB 3CX, 4CX Backhoe Loaders; JCB 506, 508, 509 Telehandlers; JCB 712, 714 Loaders
• Forklifts: JCB 4T, 5T, 7T Diesel Forklifts
• Excavators: JCB JS130, JS160, JS200 Tracked Excavators
• Other Equipment: Generators, Pumps, and Industrial machinery powered by the JCB448 engine

Important Fitment Note: This is a 0.25mm oversize bearing. It is intended for use with crankshafts that have been ground down to the first undersize dimension. Do not use with standard (non-ground) crankshafts. Verify your crankshaft journal diameter before purchase.

Global Supply & Distribution

maintains a robust global supply chain to ensure fast and reliable delivery to B2B customers worldwide. Our export team is experienced in handling international orders for heavy equipment engine components.

• Major Markets Served: North America (USA, Canada, Mexico), Europe (UK, Germany, France, Netherlands), Asia-Pacific (Australia, Singapore, UAE), Middle East (Saudi Arabia, Qatar, UAE), Africa (Nigeria, South Africa, Kenya), and South America (Brazil, Chile, Peru).
• Shipping Capabilities: We offer multiple shipping options including sea freight (FOB/CIF to major ports like Los Angeles, Rotterdam, Singapore, Dubai), air freight for urgent orders, and express courier (DHL, FedEx, UPS) for smaller consignments.
• Logistics: Fast dispatch within 24-48 hours for stock items. Our warehouse in Guangdong, China, provides efficient packing and customs documentation for seamless international trade.

Quality Assurance

is committed to delivering high-quality aftermarket engine parts that meet rigorous international standards. Our quality assurance process includes:

• Manufacturing Standards: Products are manufactured in ISO 9001 certified facilities, ensuring consistent quality control throughout production.
• Testing: Each batch undergoes dimensional inspection, material hardness testing, and surface finish verification. Machinery Test Report and Video Outgoing Inspection are available upon request.
• Warranty: We provide a 6-month warranty against manufacturing defects. This covers issues such as improper fitment due to dimensional error or material failure under normal operating conditions.

FAQ

Q1: How do I confirm that this 0.25 oversize bearing set is correct for my engine?
A: You must first ensure your engine is a JCB448 model. Then, measure the diameter of the crankshaft main journal and connecting rod journal. If the journal has been ground down by 0.25mm (0.010 inches) from the standard size, this bearing set is the correct match. If the journal is standard size, you need a standard (STD) bearing set. We recommend consulting your engine service manual or a professional machinist.

Q2: What is the installation procedure for these bearings?
A: Installation should be performed by a qualified diesel mechanic. The process involves cleaning the bearing housings and crankshaft journals, applying clean engine oil to the bearing surfaces, carefully placing the bearing shells into the connecting rods and main bearing caps, and torquing the bolts to the manufacturer’s specified settings using a torque wrench. Always check bearing clearance with Plastigage during assembly.

Q3: What maintenance is required after installing new bearings?
A: After installation, perform an initial engine run-in following the manufacturer’s guidelines. This typically involves running the engine at low idle for 15-20 minutes, checking for unusual noises, and verifying oil pressure. Change the engine oil and oil filter after the first 50 hours of operation to remove any initial wear particles. Continue with regular oil changes at the intervals specified in your engine manual to maximize bearing life.