Engine
Mack technical service bulletin S4533 202608 for 2025 Mack Anthem (An).
- Bulletin number
- S4533 202608
- Component
- Engine
- Summary
- Mack Trucks has determined that certain AN model trucks equipped with an MP8 Turbo Compound (TC) engine may experience TC Double Idler Gear failure due to incorrect bearing preload. TC units within this population are suspected to be affected, which could result in failure and potential engine damage. For the affected vehicle population, please follow the instructions provided below to remove the TC unit, replace the double idler gear with a new one, and reinstall the TC unit.
Vehicles covered
- Mack Anthem (An) 2025 2025
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