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Cummins Isx Main And Rod Bearings Torque Specs New Online
Cummins ISX — Main and Rod Bearings Torque Specs (Complete Guide)
Engine family & scope
Applicable to Cummins ISX / ISX15 (common variants 2001–present). This guide assumes standard factory-style through-bolted crankshaft and connecting rods. For model-year or aftermarket variations (e.g., replacement fasteners, ARP studs, or different rod cap designs) follow the parts supplier’s torque chart and service manual. Use new bolts where specified by Cummins.
For a Cummins ISX engine using new bolts, the torque procedure is as follows: Connecting Rod Bearings (New Bolts) cummins isx main and rod bearings torque specs new
| Engine Variant | Bolt Type | Step 1 (Sequence) | Step 2 (Sequence) | Step 3 (Angle) |
| :--- | :--- | :--- | :--- | :--- |
| ISX (2007-2010)
(Cap screw M14x2.0) | Clean/dry threads | 35 lb-ft (47 Nm) | 80 lb-ft (108 Nm) | None |
| ISX (2010-2013)
(M14x2.0 w/ lubricated) | Oil on threads | 30 lb-ft (41 Nm) | 59 lb-ft (80 Nm) | None |
| ISX (2013-2018)
(TTY Bolts) | Clean/dry | 59 lb-ft (80 Nm) | None | +185° |
| ISX15 (Egr after 2016) | Clean/dry | 59 lb-ft (80 Nm) | None | +210° | Cummins ISX — Main and Rod Bearings Torque
Safety & prep
- Work on a clean, level surface, engine secured on stand or in chassis with cooling and fuel lines disconnected.
- Use proper PPE: gloves, eye protection.
- Clean mating surfaces; remove oil, debris, and old sealant.
- Inspect bearings, journals, and bolts for damage. Replace bearings with same part number and orientation marks.
- Use calibrated torque wrench and appropriate sockets. Use angle gauge where torque+angle required.
- Apply assembly lubricant (Cummins-specified or engine assembly lube) to bearing faces and journals.
The Critical Physics of the ISX Rotating Assembly: A Deep Dive into Torque vs. TTY
When rebuilding a Cummins ISX, the difference between a 500,000-mile engine and a 500-mile catastrophe often comes down to fastener management. The ISX does not use traditional "torque-only" bolts for its mains or rods. It uses Torque-to-Yield (TTY) or Angle Torque fasteners. Work on a clean, level surface, engine secured
- 95 lb-ft → +90°
