QSB4.5 Connecting Rod 3939407 for Cummins Engine Parts – Excavator, Truck, Loader

Product Details

Product Overview

This is a high-quality connecting rod, part number 3939407, specifically designed for the Cummins QSB4.5 diesel engine. As a critical component of the engine’s rotating assembly, this connecting rod ensures reliable power transfer from the piston to the crankshaft. It is commonly used in a wide range of heavy-duty machinery, including excavators, trucks, loaders, bulldozers, buses, and forklifts.

Manufactured to OEM size specifications, this connecting rod offers a direct replacement solution for your Cummins QSB4.5 engine. It is suitable for both maintenance and repair needs, providing the durability required for demanding B2B applications in construction, logistics, and agriculture.

Key Features & Benefits

• Precise Fitment: Designed to meet OEM specifications (Part No. 3939407) for the Cummins QSB4.5 engine, ensuring a seamless installation without modifications.
• High-Strength Construction: Manufactured from forged alloy steel to withstand the high-stress environment of a diesel engine, reducing the risk of bending or fatigue failure.
• Enhanced Durability: Features precision-machined surfaces for optimal bearing contact and oil clearance, extending the service life of the engine bearing and the rod itself.
• Direct Replacement: Serves as a drop-in replacement for the original part, minimizing downtime for your heavy equipment.
• Rigorous Testing: Each unit undergoes a machinery test report and video outgoing inspection to guarantee quality and dimensional accuracy before shipping.
• Versatile Application: Compatible with a variety of heavy equipment, including excavators, loaders, and trucks, making it a versatile stock item for parts distributors.

Technical Specifications

OEM Cross-Reference

This connecting rod is a direct replacement for the following OEM part number:

• 3939407 (Cummins Original)

It is also compatible with other OEM references that may be superseded by this number. Please verify your existing part number against the 3939407 to confirm fitment.

Compatibility

This connecting rod is specifically designed for the Cummins QSB4.5 diesel engine. It is commonly used for the following applications:

• Heavy Equipment: Excavators, Bulldozers, Loaders
• Commercial Vehicles: Trucks, Buses
• Material Handling: Forklifts

Note: This part is suitable for engines found in the above machinery. Fitment is inferred based on the engine model; please confirm your specific engine serial number for compatibility.

Global Supply & Distribution

We offer worldwide shipping capabilities to meet the demands of international B2B buyers. Our logistics network ensures fast and reliable delivery to major ports and industrial centers across the globe.

• North America: Regular shipments to the USA, Canada, and Mexico for construction and trucking industries.
• Europe: Efficient distribution to the UK, Germany, France, and Eastern European markets.
• Asia-Pacific: Direct supply to Australia, Singapore, and Southeast Asian markets.
• Middle East & Africa: Serving heavy equipment fleets in the UAE, Saudi Arabia, and South Africa.

With export experience and compliance with international trade standards, we ensure your parts arrive safely and on time.

Quality Assurance

We prioritize quality to ensure your engine operates at peak performance. Our quality assurance process includes:

• Manufacturing Standards: Parts are produced under strict ISO-compliant processes, using high-grade forged steel.
• Testing: Each connecting rod is subjected to a machinery test report to verify dimensional accuracy and structural integrity.
• Inspection: A video outgoing inspection is provided for every order, allowing you to verify the product before shipment.
• Warranty: We offer a 6-month warranty against manufacturing defects, providing you with peace of mind for your purchase.

FAQ

Q1: Is this connecting rod a direct fit for my Cummins QSB4.5 engine?
Yes, part number 3939407 is designed as a direct replacement for the OEM connecting rod in the Cummins QSB4.5 engine. It is manufactured to OEM size specifications. However, we always recommend comparing the part number with your existing rod to confirm compatibility before installation.

Q2: What is the recommended installation procedure for this connecting rod?
Installation should be performed by a qualified diesel mechanic. Key steps include: cleaning the bore, checking the rod for straightness, installing new bearings, and torquing the connecting rod bolts to the manufacturer’s specifications (typically 80-100 ft-lbs for this engine class, but always refer to the Cummins service manual). Do not reuse old bolts.

Q3: How does this aftermarket part compare to a genuine Cummins part?
This connecting rod is manufactured to meet OEM specifications for material and dimensions. While it is not a genuine Cummins branded part, it offers a cost-effective alternative for maintenance and repair. We provide a 6-month warranty to ensure your satisfaction. For critical applications where original parts are required, please consult your parts manual.