QSM11 Main Bearing & Connecting Rod Bearing STD – Cummins Diesel Engine Parts

Product Details

Product Overview

This premium set includes both the Main Bearings and Connecting Rod Bearings in Standard (STD) size, specifically engineered for the Cummins QSM11 diesel engine. As critical components of the engine’s rotating assembly, these bearings ensure precise crankshaft and connecting rod support, reducing friction and wear under high-load conditions.

Manufactured to meet OEM specifications, this bearing set is an ideal replacement for maintaining or rebuilding a QSM11 powerplant. Commonly utilized in heavy-duty applications such as excavators, loaders, trucks, bulldozers, and buses, these parts are essential for restoring engine performance and reliability. Please verify your engine’s specific requirements to confirm fitment before installation.

Key Features & Benefits

• OEM Standard Dimensions: Manufactured to strict OEM tolerances for a precise, direct-fit replacement without the need for machining.
• Durable Material Composition: Constructed from high-strength steel with a specialized bearing lining to withstand extreme pressure and high temperatures.
• Enhanced Wear Resistance: Engineered to provide excellent anti-friction properties, extending the lifespan of both the bearings and the crankshaft journals.
• Complete Set Convenience: Includes both main and connecting rod bearings in one package, simplifying the ordering process for a full rebuild.
• Rigorous Quality Control: Each bearing undergoes dimensional inspection and material verification to ensure consistent performance.
• Cost-Effective Solution: Offers a high-quality aftermarket alternative to genuine OEM parts without compromising on fit or function.

Technical Specifications

OEM Cross-Reference

This bearing set is designed as a direct replacement for the following OEM part numbers used in Cummins QSM11 engines. Always cross-reference your original part number to ensure compatibility.

• Main Bearing: 3089040, 3089039, 3089041
• Connecting Rod Bearing: 3089050, 3089049, 3089051
• Replaces OEM part numbers for QSM11 and related engine platforms.

Compatibility

This bearing set is specifically designed for the Cummins QSM11 diesel engine. It is commonly used for the following applications:

• Construction Equipment: Excavators, Bulldozers, Wheel Loaders
• Industrial Vehicles: Forklifts
• On-Highway Trucks: Heavy-duty trucks and tractor units
• Commercial Vehicles: Buses and coaches

Note: Always verify engine serial number and bearing size (STD, 0.25, 0.50) before purchase.

Global Supply & Distribution

We offer reliable worldwide shipping for this product, ensuring fast delivery to major industrial centers and ports globally. Our distribution network covers North America, Europe, Asia-Pacific, the Middle East, Africa, and South America. With extensive experience in international trade, we provide efficient logistics solutions, including air freight and sea freight, to meet your urgent requirements. We are committed to ensuring your parts arrive safely and on time, regardless of your location.

Quality Assurance

All engine bearings are manufactured under strict quality management systems. Each production batch is subject to rigorous testing, including dimensional verification, material hardness checks, and surface finish analysis. We provide a Machinery Test Report and offer Video Outgoing Inspection upon request to guarantee product quality before dispatch. This commitment to quality is backed by a 6-month warranty against manufacturing defects.

FAQ

Q: How can I confirm if this STD bearing set is correct for my QSM11 engine?
A: The STD (Standard) size is for original factory crankshaft journals and connecting rod bores that have not been machined. You must check the markings on your old bearings or measure the crankshaft journal diameter. If the journals are worn or have been ground, an undersize bearing (e.g., 0.25mm or 0.50mm) is required. Always consult your engine’s service manual.

Q: What is the recommended installation procedure for these bearings?
A: Installation should be performed by a qualified diesel mechanic. Ensure all bearing surfaces, the crankshaft journals, and the connecting rod bores are perfectly clean and free of debris. Apply clean engine oil to the bearing surfaces before assembly. Tighten all main bearing and connecting rod bolts to the manufacturer’s specified torque settings using a calibrated torque wrench.

Q: What maintenance is required after installing new main and rod bearings?
A: After installation, perform an initial engine start-up and check for proper oil pressure immediately. It is critical to run the engine at a low idle for several minutes to ensure oil circulation. We recommend changing the engine oil and oil filter after the first 50 hours of operation to remove any assembly debris. Regularly scheduled oil changes using the correct viscosity oil are essential for long bearing life.