QSF2.8 ISF2.8 Main Crankshaft Bearing 4996250 4946030 4946031 & Connecting Rod Bearing for Cummins

Product Details

Product Overview

This precision-engineered bearing set includes both main crankshaft bearings and connecting rod bearings, specifically designed for the Cummins QSF2.8 and ISF2.8 diesel engine platforms. The kit comprises part numbers 4996250, 4946030, and 4946031, providing a complete solution for engine overhaul or maintenance.

Manufactured to OEM size specifications, these bearings are critical components for ensuring proper crankshaft support and connecting rod alignment within the engine block. They are commonly used in a wide range of applications including construction equipment, industrial machinery, agricultural tractors, generator sets, marine engines, and material handling equipment powered by the Cummins 2.8L diesel engine.

As a direct replacement for the original equipment parts, this bearing set is engineered to meet the demanding tolerances required for reliable engine operation. The components are sourced from, a recognized aftermarket supplier, and are suitable for both professional mechanics and equipment fleet managers.

Key Features & Benefits

• Complete Bearing Set: Includes both main crankshaft bearings (4996250, 4946030, 4946031) and connecting rod bearings for a comprehensive engine rebuild solution.
• OEM Equivalent Dimensions: Manufactured to original equipment size specifications, ensuring proper fitment and oil clearance without modification.
• Durable Material Composition: Constructed from high-strength bearing material designed to withstand the high loads and temperatures of turbocharged diesel operation.
• Precision Tolerance Control: Each bearing is machined to tight tolerances for consistent wall thickness and proper crush height, reducing the risk of bearing failure.
• Versatile Application: Compatible with multiple engine variants (QSF2.8 and ISF2.8) used across construction, agriculture, marine, and industrial sectors worldwide.
• Cost-Effective Solution: Offers significant savings compared to purchasing individual bearings or complete OEM bearing sets, without compromising on quality.
• Easy Identification: All part numbers (4996250, 4946030, 4946031) are clearly marked for verification against your engine specifications.

Technical Specifications

OEM Cross-Reference

This bearing set directly replaces the following original equipment manufacturer (OEM) part numbers:

• Cummins Part Numbers: 4996250 (Main Bearing), 4946030 (Main Bearing), 4946031 (Main Bearing)
• Note: These numbers correspond to the specific bearing shells used in the Cummins ISF2.8 and QSF2.8 engine families. Always verify the exact part number stamped on your existing bearing or consult your engine parts manual for confirmation.

Compatibility

This bearing set is specifically designed for use in the following engine platforms:

• Primary Applications: Cummins QSF2.8 and ISF2.8 diesel engines
• Common Equipment Applications: This engine series is widely used in:
  • Construction: Mini excavators, skid steer loaders, compact track loaders
  • Agriculture: Small tractors, harvesters, sprayers
  • Industrial: Forklifts, aerial work platforms, compressors
  • Genset: Generator sets and power units
  • Marine: Auxiliary engines and small vessel propulsion
  • Handling: Material handling equipment and warehouse machinery
• Important Fitment Note: While this bearing set is designed for the QSF2.8/ISF2.8 engine family, variations exist between engine builds and equipment manufacturers. We strongly recommend comparing the part numbers (4996250, 4946030, 4946031) with your engine’s service manual or removed bearings to ensure correct fitment before installation.

Global Supply & Distribution

We maintain a robust global supply chain to serve B2B customers across all major markets. Our distribution network supports fast and reliable delivery to:

• North America: Major ports including Los Angeles, Houston, New York, and inland industrial hubs
• Europe: Rotterdam, Hamburg, Antwerp, and key distribution centers in Germany, UK, and France
• Asia-Pacific: Singapore, Shanghai, Tokyo, Sydney, and emerging markets in Southeast Asia
• Middle East & Africa: Dubai, Jeddah, and major African ports for mining and construction sectors
• South America: Santos, Buenos Aires, and industrial centers in Brazil and Chile

We offer flexible shipping options including air freight for urgent orders, sea freight for bulk purchases, and express courier services for smaller quantities. Our export documentation is fully compliant with international trade requirements, including commercial invoices, packing lists, and certificates of origin as needed.

Quality Assurance

Every bearing set undergoes rigorous quality control procedures to ensure reliability and performance:

• Manufacturing Standards: Produced in ISO-certified facilities with strict adherence to dimensional tolerances and material specifications.
• Testing: Each batch is subject to hardness testing, dimensional inspection, and surface finish verification. Video outgoing inspection is available upon request.
• Warranty: All products are backed by a 6-month warranty against manufacturing defects in materials and workmanship.
• Traceability: Each part is marked with its part number and batch code for full traceability back to the production run.

FAQ

Q: How do I verify that these bearings will fit my specific Cummins QSF2.8 engine?
A: First, locate the part numbers on your existing bearings (typically stamped on the back of each shell). Match them against 4996250, 4946030, and 4946031. Also verify your engine model plate confirms it is a QSF2.8 or ISF2.8. If your engine has been previously rebuilt with oversized bearings, standard size bearings may not fit. When in doubt, measure your crankshaft journal diameters or consult your engine’s service manual for the correct bearing grade.

Q: What is the correct installation procedure for these bearings?
A: Installation requires careful attention to cleanliness and torque specifications. Ensure all bearing surfaces and the bearing housing are clean and free of debris. Apply a thin film of clean engine oil to the bearing surface before installation. Do NOT use any grease or assembly lube on the back of the bearing shell. Torque main bearing cap bolts and connecting rod bolts to the manufacturer’s specifications (typically found in the Cummins QSF2.8 service manual). Always check bearing clearance using Plastigage on at least two journals to confirm proper oil clearance before final assembly.

Q: Can these bearings be used in high-performance or modified engines?
A: These bearings are designed for standard OEM specifications and normal operating conditions. For engines that have been modified for increased power output, turbocharger upgrades, or high-performance applications, we recommend consulting with an engine builder to determine if standard bearings are sufficient. For standard rebuilds and replacement applications, these bearings provide reliable service under normal loads and operating temperatures.