Cummins QSX Parts – Connecting Rod Section

The connecting rod assembly is one of the most critical elements inside the Cummins QSX engine. It links the piston to the crankshaft, converting linear motion into the rotary power that drives industrial and marine applications. Because of the immense stresses placed on these components, maintaining high-quality connecting rod parts—including bearings and bolts—is essential to engine performance, efficiency, and long-term durability.

At Diesel Pro Power, trusted by over 40,000 satisfied customers worldwide, we provide complete connecting rod solutions for Cummins QSX engines. Whether you are completing a minor repair, preventative maintenance, or a full rebuild, you can find the exact rod bearings and fasteners you need to keep your engine operating at factory specifications.

Connecting Rod Bearings for Cummins QSX

Connecting rod bearings form a smooth, low-friction surface between the connecting rod and crankshaft. Their job is to minimize wear, reduce heat, and distribute load evenly. When bearings wear out, you may notice symptoms such as low oil pressure, knocking noises, or excessive metal particles in the oil. Replacing bearings at the correct size is a vital step in any rebuild or repair process.

Standard Size Connecting Rod Bearing Set – Cummins QSX

The standard-size bearing set includes both the upper and lower halves required to service a single connecting rod. These are designed for QSX engines running with factory-dimension crankshafts, ensuring proper oil clearance and fitment. Each set restores the essential oil film that prevents metal-to-metal contact under heavy loads.

Oversize 0.25 mm Connecting Rod Bearing Set – Cummins QSX

When a crankshaft has been ground to correct wear or scoring, oversize bearings are required. The 0.25 mm oversize set ensures precise fitment after machining, keeping oil clearance within specifications and restoring reliability. This is the correct choice if your QSX crankshaft journals have been reground one step below standard.

Oversize 0.50 mm Connecting Rod Bearing Set – Cummins QSX

For crankshafts requiring more extensive reconditioning, the 0.50 mm oversize bearings are used. These bearings provide the same level of precision and reliability as standard, but are engineered for larger journal repairs. They are critical in restoring full functionality to engines that have undergone major crankshaft service.

Connecting Rod Bolts for Cummins QSX

Connecting rod bolts secure the rod cap to the connecting rod body, clamping the bearings tightly around the crankshaft journal. Because of the extreme loads in the QSX engine, bolts must provide consistent tension without stretching or failing.

• Each QSX connecting rod requires two bolts.

• Proper torque and installation technique are vital for long-term engine reliability.

• Using new bolts during any rebuild is highly recommended to avoid fatigue-related failures.

These bolts are manufactured to Cummins’ specifications for tensile strength and fatigue resistance, ensuring maximum security for your rod assemblies.

Why Choose Diesel Pro Power for Cummins QSX Connecting Rod Parts?

• Quality Assurance – Every bearing set and bolt is designed to meet or exceed Cummins OEM standards.

• Worldwide Availability – We ship quickly to over 180 countries, keeping marine and industrial engines running with minimal downtime.

• Proven Experience – With 40,000+ satisfied customers, Diesel Pro Power is the leading online source for Cummins QSX engine components.

• One-Stop Shop – From bearings and bolts to gaskets, injectors, and overhauls, our catalog covers every part of the QSX engine.