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(If you want, I can fetch the exact OEM torque chart for a specific ISX model/year or engine serial number.)

To achieve these specs accurately, avoid "calibrated elbow."

Before we dive deep, here is the data directly from Cummins Service Manuals (Sections 003-016 and 102-006).

| Component | Bolt Size / Grade | Torque (lb-ft) | Torque (Nm) | Notes | | :--- | :--- | :--- | :--- | :--- | | | M12 x 1.75 (10.9) | 72 lb-ft | 98 Nm | + 90° angle turn (for TTY bolts) | | Flywheel Housing to Cylinder Block | M10 x 1.5 (10.9) | 47 lb-ft | 64 Nm | Early ISX (pre-2007) | | Flywheel to Crankshaft | M14 x 1.5 (12.9) | 135 lb-ft + 90° | 183 Nm + 90° | Must use new bolts | | Starter Motor to Housing | M12 x 1.75 | 76 lb-ft | 103 Nm | Apply medium thread locker | | Accessory Mounts (Sensors, Covers) | M8 x 1.25 | 21 lb-ft | 28 Nm | Do not overtighten |

Use a gasket scraper and solvent to remove all old sealant from the engine block and housing.

The torque values depend on the specific bolt sizes used in your SAE-size housing. Adhering to manufacturer-specified torque values is necessary to prevent oil leaks and ensure proper alignment.