Cummins Isx Flywheel Housing Torque Specs High Quality May 2026

Cummins ISX Flywheel Housing Torque Specs

General torque specs (common ISX 15L / ISX 12L where applicable)

• Flywheel housing-to-engine block bolts: 95–115 ft·lb (129–156 N·m) — torque in a crisscross pattern, tighten gradually in 3 steps.
• Flywheel housing to transmission bolts (main bellhousing bolts): 70–90 ft·lb (95–122 N·m).
• Pilot bearing / throwout bearing fasteners (if applicable): 25–35 ft·lb (34–47 N·m).
• Flywheel bolts (to crank): 200–230 ft·lb (271–312 N·m) — usually final torque plus angle specification per flywheel manufacturer.
• Starter motor mounting bolts: 45–60 ft·lb (61–81 N·m).

For the Cummins ISX (including ISX15 and X15), the flywheel housing torque depends on the bolt size used in your specific SAE housing configuration.  ⚙️ Flywheel Housing Torque Specs  M10 Bolts: [ ] M12 Bolts: [ ]

, though 75 ft-lbs remains the most common standard for the main mounting bolts. Specialty Chassis (e.g., some PACCAR/Kenworth builds): Cummins Isx Flywheel Housing Torque Specs

Preparation: Ensure the rear main seal is installed and surfaces are clean. Use guide studs (typically 5/8-18) to align the heavy housing. Cummins ISX Flywheel Housing Torque Specs General torque

Related Specifications

While working on the flywheel housing, you may need these related torque specs: For the Cummins ISX (including ISX15 and X15),

Cummins ISX Flywheel Housing Torque Specs