{"nhtsa_id":11036596,"type":"service_campaign","type_name":"Service campaign","date_added":"2026-09-02","date":"2026-08-05","document_id":"S4533 202608","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":"Engine: Turbo","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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11036596-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11036596-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11036596","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"ANTHEM (AN)","year_from":2025,"year_to":2025,"match":"base","vehicle_ids":["2025_mack_anthem"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}