QSB3.3 B3.3 Main Crankshaft Bearing And Connecting Rod Bearing For Cummins Engine Parts

Product Details

Product Overview

This precision-engineered set includes the main crankshaft bearings and connecting rod bearings specifically designed for the Cummins QSB3.3 and B3.3 diesel engine platforms. As critical components within the engine’s rotating assembly, these bearings ensure proper oil clearance, reduce friction, and support the high-load demands of the crankshaft and connecting rods. Manufactured by to OEM size specifications, this bearing set is a direct replacement for worn or damaged components in Cummins B3.3 series engines.

Commonly used in a wide range of industrial applications including construction equipment, agricultural machinery, generator sets, marine propulsion, and material handling, these bearings are essential for maintaining engine performance and longevity. The set includes all necessary main bearings and rod bearings for a complete overhaul, providing a reliable solution for engine rebuilds and repairs.

Key Features & Benefits

• OEM Specification Fitment: Manufactured to the exact OEM size and tolerances for the Cummins QSB3.3/B3.3, ensuring a precise fit and correct oil clearance without modification.
• Durable Material Composition: Constructed from high-grade bearing material with excellent fatigue resistance and load-bearing capacity to withstand the high pressures of diesel engine combustion.
• Complete Bearing Set: Includes both main crankshaft bearings and connecting rod bearings in one package, simplifying the ordering process for a full engine rebuild.
• Precision Machining: Each bearing is precision-machined for consistent wall thickness and surface finish, reducing the risk of hot spots and premature wear.
• Enhanced Engine Life: Properly fitted new bearings restore correct clearances, reduce vibration, and protect the crankshaft and connecting rods from damage, extending overall engine service life.
• Reliable Performance: Designed for the demanding conditions of construction, agriculture, marine, and industrial applications where consistent power output is critical.

Technical Specifications

OEM Cross-Reference

This bearing set is designed as a direct replacement for the following original Cummins part numbers and their equivalent cross-references:

• Cummins Main Bearings: Refer to OEM part numbers specific to the QSB3.3/B3.3 block (e.g., 3977126, 3927371 – verify with your engine serial number).
• Cummins Connecting Rod Bearings: Refer to OEM part numbers specific to the QSB3.3/B3.3 connecting rod (e.g., 3977127, 3927372 – verify with your engine serial number).
• Note: Always verify the original part numbers from your engine’s service manual or the existing bearings before ordering. This set is for standard size OEM bearings. Oversized or undersized bearings are not included.

Compatibility

This main bearing and connecting rod bearing set is commonly used for Cummins QSB3.3 and B3.3 diesel engines found in the following equipment and applications:

• Construction: Excavators, compactors, and mini loaders.
• Agriculture: Tractors, harvesters, and irrigation pumps.
• Industrial: Forklifts, air compressors, and generator sets.
• Marine: Auxiliary engines and propulsion systems.
• Material Handling: Boom lifts, scissor lifts, and telehandlers.

Important: Fitment is inferred based on the engine model. Always confirm compatibility with your specific engine serial number and application before purchase.

Global Supply & Distribution

maintains a robust global supply chain to deliver engine components to buyers worldwide. With our base in Guangdong, China, we are strategically positioned for efficient export logistics.

• Worldwide Shipping: Reliable shipping options via sea, air, and express courier (DHL, FedEx, UPS, TNT) to all major international destinations.
• Major Markets Served: North America (USA, Canada, Mexico), Europe (Germany, UK, France, Italy), Asia-Pacific (Australia, Japan, South Korea, Southeast Asia), Middle East (UAE, Saudi Arabia), and Africa.
• Fast Delivery: Efficient processing and dispatch to major ports like Shenzhen, Guangzhou, and Hong Kong, with express delivery options for urgent orders.
• Export Experience: Experienced in international trade documentation, customs clearance, and compliance with export regulations for automotive parts.

Quality Assurance

We are committed to providing high-quality replacement parts that meet rigorous standards.

• Manufacturing Standards: Components are produced in ISO-certified facilities with strict quality control processes.
• Testing Procedures: Each batch undergoes dimensional inspection and material verification. Video outgoing inspection and machinery test reports are available upon request.
• Warranty: This product is backed by a 6-month warranty against manufacturing defects. After-warranty online support is available for technical inquiries.
• Inspection: Pre-shipment inspection ensures parts are clean, properly packaged, and match the ordered specifications.

FAQ

Q: How do I know if these bearings will fit my Cummins QSB3.3 engine?
A: This set is designed for standard size OEM main and rod bearings used in the QSB3.3 and B3.3 engine blocks. To confirm fitment, you must check your engine’s serial number and the original bearing part numbers. If your crankshaft has been ground or your block has been line-bored, you may require undersized or oversized bearings. Always consult your engine service manual for the correct bearing grade.

Q: What is the installation procedure for these bearings?
A: Installation requires mechanical expertise. The engine must be disassembled, and the crankshaft and connecting rods removed. Clean all bearing surfaces thoroughly. Apply a thin layer of clean engine oil to the bearing shells. Install the main bearings into the block and main caps, and the rod bearings into the connecting rods and caps. Torque all fasteners to the manufacturer’s specified tightening sequence and torque values. Always check bearing clearance using Plastigage.

Q: What is the typical lifespan of these bearings after installation?
A: The lifespan depends heavily on engine maintenance, operating conditions, and load. With proper installation, correct oil clearance, regular oil and filter changes using the recommended oil grade, and avoiding excessive engine loads, these bearings can provide thousands of hours of reliable service. Contaminated oil, low oil pressure, or overheating will significantly reduce bearing life.