K25 Main Bearing & Connecting Rod Bearing Std 12231-fy500 12111-fy500 for Nissan Forklift Excavator

Product Details

Product Overview

This premium engine bearing set includes both the main bearing (12231-fy500) and connecting rod bearing (12111-fy500) in standard size, specifically engineered for the Nissan K25 diesel engine platform. These precision-ground bearings are manufactured to OEM specifications, ensuring reliable performance and extended service life in demanding applications.

Designed as a direct replacement for Nissan industrial engines, this bearing set is commonly used in forklifts, excavators, loaders, and other heavy equipment where the K25 engine provides power. The standard (Std) sizing offers a factory-specification fit for engines with original crankshaft dimensions, making installation straightforward for qualified technicians.

Each bearing shell is manufactured from high-strength steel-backed material with a specialized overlay, providing excellent fatigue resistance and load-carrying capacity essential for diesel engine operation.

Key Features & Benefits

• Precision Engineering: Manufactured to exact OEM tolerances with part numbers 12231-fy500 (main bearing) and 12111-fy500 (connecting rod bearing) for guaranteed fitment confidence.
• Standard Size Fit: STD (Standard) sizing ensures compatibility with factory-specification crankshaft journals, eliminating the need for undersize machining.
• Durable Construction: Steel-backed design with copper-lead overlay provides superior load distribution and wear resistance for extended engine life.
• OEM Replacement Ready: Direct replacement for Nissan K25 diesel engines commonly found in industrial equipment and material handling machinery.
• Complete Set Solution: Includes both main and connecting rod bearings in one package, reducing procurement complexity for engine rebuilds.
• Rigorous Quality Control: Each bearing undergoes dimensional inspection and material verification to ensure consistent quality across every production batch.

Technical Specifications

OEM Cross-Reference

This bearing set is manufactured to match the following OEM part specifications for the Nissan K25 diesel engine:

• Main Bearing: 12231-fy500 (Nissan OEM reference)
• Connecting Rod Bearing: 12111-fy500 (Nissan OEM reference)

These part numbers correspond directly to factory-specification bearings used in Nissan K25 engine assemblies. Always verify your engine’s crankshaft condition and bearing journal measurements before installation.

Compatibility

Engine Compatibility: This bearing set is specifically designed for the Nissan K25 diesel engine. The K25 is a 2.5L industrial diesel engine commonly used in Japanese-manufactured equipment.

Vehicle/Equipment Applications: Commonly used for the following equipment types (fitment may vary by model year and configuration):

• Forklifts (Nissan, TCM, Komatsu, Toyota)
• Excavators (mini excavator applications)
• Loaders and compact wheel loaders
• Bulldozers and crawler equipment
• Trucks and utility vehicles
• Bus and generator applications

Important: Always confirm your engine model, serial number, and crankshaft journal condition before ordering. This standard size bearing is intended for engines with original, unworn crankshaft journals.

Global Supply & Distribution

We maintain comprehensive inventory of Nissan K25 engine bearings and ship worldwide from our distribution centers in Guangdong, China. Our logistics network ensures timely delivery to major industrial markets including:

• North America: Regular shipments to US West Coast (Los Angeles, Seattle), East Coast (New York, Savannah), and Canadian industrial centers (Toronto, Vancouver).
• Europe: Fast delivery to Rotterdam, Hamburg, Antwerp, and major inland hubs serving Germany, UK, France, and Eastern Europe.
• Asia-Pacific: Direct service to Japan, South Korea, Australia, Singapore, and Southeast Asian markets.
• Middle East & Africa: Regular shipments to Dubai, Jeddah, and major African ports.
• Latin America: Service to Brazil, Mexico, Chile, and key industrial centers.

We offer flexible shipping options including express courier (DHL, FedEx, UPS) for urgent orders and sea freight for bulk requirements. All shipments include proper export documentation and customs clearance support.

Quality Assurance

Our K25 engine bearings are manufactured under strict quality control procedures that include:

• Material Certification: All bearing materials are sourced from approved suppliers with full chemical composition and mechanical property verification.
• Dimensional Accuracy: Each bearing is inspected using precision measurement equipment to ensure wall thickness, curvature, and length meet OEM specifications.
• Machinery Test Report: Available upon request, providing documented evidence of quality compliance.
• Video Outgoing Inspection: We can provide video documentation of the inspection process for quality verification.
• Warranty Coverage: 6-month warranty against manufacturing defects, providing peace of mind for your engine rebuild project.

FAQ

Q1: How do I verify that these standard size bearings will fit my K25 engine?
A: Before installing standard size bearings, your crankshaft journals must be measured with a micrometer. Standard bearings require journal diameters within factory specifications (typically within 0.025mm of original size). If your crankshaft shows any wear, scoring, or out-of-round condition, you may require undersize bearings and crankshaft grinding. We recommend having a qualified engine machinist inspect the crankshaft before ordering.

Q2: What is the recommended installation procedure for these bearings?
A: Installation should follow standard engine rebuilding procedures: clean all bearing surfaces thoroughly, check bearing crush height, apply clean engine oil to bearing surfaces, torque main bearing and connecting rod bolts to manufacturer specifications using a calibrated torque wrench. Always use new bolts and follow the correct tightening sequence. The bearing shells are position-sensitive – ensure the locating tangs align correctly with the grooves in the connecting rod and main bearing caps.

Q3: What maintenance is required after installing new main and connecting rod bearings?
A: After bearing installation, the engine should be primed with oil pressure before starting to prevent dry-start damage. During the first 50 hours of operation, avoid heavy loads and high RPM operation to allow proper bearing break-in. Change engine oil and filter after the initial break-in period. Regularly monitor oil pressure and watch for any unusual engine noises that might indicate bearing issues. Use only the recommended oil viscosity for your K25 engine application.