cummins isx main bearing torque specs



As a website operator, I understand the importance of providing accurate and helpful information to our visitors. One query that often comes up is regarding the Cummins ISX main bearing torque specs. Cummins is a well-known name in the diesel engine industry, and their ISX series engines are widely used in heavy-duty trucks and other vehicles. This article aims to provide a comprehensive guide to the main bearing torque specifications for the Cummins ISX engines.

Cummins ISX – A Brief Overview

Before delving into the torque specs, let’s take a quick look at the Cummins ISX engine series. These engines are 4-cycle, in-line 6-cylinder, and equipped with an overhead camshaft. They come in two variants – the ISX12 for lighter loads and the ISX15 for heavier loads. The engine offers a power output ranging from 335 to 605 horsepower and a peak torque of up to 2,050 lb-ft. It features advanced technologies such as Exhaust Gas Recirculation (EGR), Cummins Aftertreatment System, and VGT Turbocharger to meet the strict emission standards.

What are Main Bearings?

Main bearings are an essential part of the engine’s bottom end. They support the weight of the crankshaft and ensure a smooth rotation. The bearings protect the crankshaft from coming into contact with the engine block and reduce the friction between the two surfaces. A properly installed and torqued main bearing set ensures an extended engine life.

ISX Main Bearing Torque Specs

The main bearing torque specs for the Cummins ISX engine series vary based on the engine model and year. Here are the torque specs for the latest models:

  • ISX15 CM2350 X101 – 116 lb-ft
  • ISX15 CM2350 X114 – 130 lb-ft
  • ISX15 CM871 – 140 lb-ft
  • ISX12 CM2350 X126 – 140 lb-ft
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It’s essential to note that these torque values are for clean and dry threads. If there is any lubrication or debris on the threads, the torque value must be adjusted accordingly. Additionally, you should use a calibrated torque wrench to achieve the desired torque with precision.


In conclusion, the Cummins ISX engine series is a powerful and reliable option for heavy-duty vehicles. Ensuring the proper torque of the main bearings is crucial for the engine’s longevity and performance. As a responsible website operator, we strive to provide accurate and comprehensive information on engine specifications that are valid at the time of publication. However, it’s important to verify the information with the manufacturer or a reliable mechanic to avoid any mishap. We hope this article has been helpful in understanding the main bearing torque specifications for the Cummins ISX engines.