Cummins Isx Main And Rod Bearings Torque Specs New ((full)) Jun 2026
The connecting rods endure immense stress at high RPMs, and each rod bolt must be precisely torqued. The procedure differs depending on whether you are using new or used bolts.
The ISX uses a fractured-cap design. The rod bolts experience immense tensile stress. For new rod bearings, you must follow the "Rod Bolt Stretch" method or the equivalent torque-angle.
Main bearing caps use a different torque value and a larger final rotation angle. : Tighten both capscrews on each main bearing cap to : Loosen both capscrews completely. : Retighten in the recommended sequence to (149 N•m). : Rotate each capscrew an additional 180 degrees JustAnswer Critical Assembly Tips ISX Cummins Rod And Main Bearing Torque Specifications cummins isx main and rod bearings torque specs new
Use a paint pen to mark the bolt heads after Step 2. This provides a visual reference to ensure every bolt has been rotated exactly 60 degrees. 📏 Installation Best Practices
The main bearing caps use a "torque plus angle" method. Lubricate the threads and bolt heads with clean 15W-40 engine oil before starting. Tighten to 110 ft-lb (149 N•m) Rotate an additional 180 degrees The connecting rods endure immense stress at high
Always follow a star or crisscross pattern starting from the center main bearing (Journal #4) and working your way outward to the ends (Journals 3, 5, 2, 6, 1, 7). Torque Specifications Torque Value / Angle Initial Torque 150 N·m [110 ft-lb] Step 2 Secondary Torque 300 N·m [221 ft-lb] Step 3 Final Rotation Turn 90 degrees clockwise
Like the main bearings, the connecting rod bolts require a multi-step process to ensure the rod cap is perfectly seated and the bolt is properly stretched. Standard Rod Bearing Bolt Sequence Tighten bolts to 70 lb-ft (95 Nm). Step 2: Tighten bolts to 140 lb-ft (190 Nm). Step 3: Rotate each bolt an additional 60 degrees . Rod Bolt Precautions The rod bolts experience immense tensile stress
| Component | Fastener Type | Step | Torque Specification | Notes | | :--- | :--- | :--- | :--- | :--- | | | New/Standard | 1 | 149 Nm (110 lb-ft) | Use a calibrated torque wrench. | | | | 2 | +180° rotation | Use an angle gauge for accuracy. | | Connecting Rod Bolts | Used | 1 | 70 Nm (52 lb-ft) | Torque in sequence. | | | | 2 | +60° rotation | Use an angle gauge. | | | New (TTY) | 1 | 40 Nm (30 lb-ft) | Initial torque. | | | | 2 | Loosen completely | Reset the bolt. | | | | 3 | 70 Nm (52 lb-ft) | Final torque. | | | | 4 | +60° rotation | Final angle turn. | | Oil Pump Bolts | Standard | | 56 Nm (41 lb-ft) | Torque value for the four mounting capscrews. | | Oil Pan Bolts | Standard | | 56 Nm (41 lb-ft) | Torque value for all oil pan bolts. |
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