Connecting Rod Bearings & Related Components for Cummins ISX Single Cam Engines

The connecting rod bearings are one of the most critical wear components inside the Cummins ISX Single Cam engine. They provide a smooth, durable interface between the connecting rod and crankshaft, reducing friction, distributing oil for lubrication, and protecting against metal-to-metal contact during combustion. A properly maintained bearing set ensures consistent oil pressure, minimizes vibration, and extends crankshaft life.

At Diesel Pro Power, we supply premium-quality connecting rod bearings and hardware for Cummins ISX Single Cam engines, trusted by over 40,000 satisfied customers worldwide. Whether you are performing a full in-frame overhaul, addressing low oil pressure symptoms, or replacing worn components during preventive maintenance, our selection of connecting rod bearings and bolts is engineered for reliability and long-term performance.

Standard Connecting Rod Bearings for Cummins ISX Single Cam

Standard-size connecting rod bearings are designed for engines where the crankshaft journal surfaces remain within factory specification. These bearings are manufactured to exact Cummins tolerances, ensuring proper oil clearance and lubrication under heavy load and continuous operation.

Each standard bearing set includes both the upper and lower half shells required to service one connecting rod. These are coated with durable overlays designed to resist fatigue, cavitation erosion, and corrosion from modern fuel and oil formulations.

Oversize Connecting Rod Bearings for Cummins ISX Single Cam

When crankshaft journals have been ground or machined during a rebuild, oversize connecting rod bearings are required. These bearings compensate for the removed material and restore the proper oil clearance between the connecting rod and crankshaft.

We supply oversize bearing sets in multiple dimensions, including:

• 0.25 mm Oversize Bearings
  Designed for crankshafts machined 0.25 mm undersize. These provide restored fitment while maintaining proper oil film thickness.

• 0.50 mm Oversize Bearings
  Recommended for crankshafts that have undergone more extensive machining. These heavy-duty bearings are precision manufactured to align perfectly with the connecting rod bore while preventing oil leakage or premature wear.

Like standard sets, each oversize kit includes the upper and lower shells to service one connecting rod.

Connecting Rod Bolts for Cummins ISX Single Cam

Every time a connecting rod bearing is serviced, connecting rod bolts should be replaced. These bolts are engineered to stretch when torqued, locking the cap securely to the rod and ensuring precise bearing crush. Reusing old bolts can lead to uneven clamp loads, bearing movement, and eventual catastrophic engine failure.

For the ISX Single Cam, each connecting rod requires two bolts. Our genuine-specification replacement bolts are heat-treated and coated for strength and corrosion resistance, meeting Cummins torque specifications.

Importance of Proper Bearing Clearance

The performance and longevity of the Cummins ISX Single Cam engine depends on maintaining the correct oil clearance between the crankshaft and connecting rod bearings. Too little clearance may lead to overheating and oil starvation, while excessive clearance can cause low oil pressure, knocking, and accelerated crankshaft wear.

When installing new bearings:

• Always measure journal diameters and bearing clearances with micrometers and plastigauge.

• Confirm clearances meet Cummins factory specifications.

• Replace connecting rod bolts to achieve proper clamp load.

• Lubricate new bearings with clean assembly lube to prevent dry start-up conditions.

When to Replace Connecting Rod Bearings

Replacing connecting rod bearings in the Cummins ISX Single Cam is critical under the following conditions:

• Oil Pressure Loss: Low oil pressure readings may indicate worn bearings.

• Metal Debris in Oil: Bearing material can appear as silver or copper flakes during oil analysis.

• Knocking Noise: Rod knock under load often suggests bearing clearance issues.

• Engine Overhaul: Bearings should always be replaced during a rebuild, regardless of condition.

Connecting Rod Bearings in Preventive Maintenance

Even if your engine has not yet shown signs of bearing failure, preventive maintenance can save time and money. For fleets and marine operators relying on Cummins ISX Single Cam engines, scheduling bearing replacement at manufacturer-recommended service intervals ensures consistent uptime and reduces the risk of sudden failures.

Diesel Pro Power Advantage

• Worldwide Shipping – Fast delivery so you get your engine back in service quickly.

• Expert Support – Our team understands Cummins ISX Single Cam engines and can help identify the correct size bearing for your crankshaft condition.

• Trusted by 40,000+ Customers – Reliability and repeat service are at the core of what we do.

• One-Stop Shop – Alongside connecting rod bearings, we supply overhaul kits, gaskets, cylinder heads, injectors, oil pumps, and more.