{"nhtsa_id":11029643,"type":"service_campaign","type_name":"Service campaign","date_added":"2026-03-05","date":"2026-02-20","document_id":"E335","mfr_campaign":"E335","replaces":null,"component":"ENGINE","mfr_system":null,"summary":"Certain EPA21 compliant PACCAR MX-13 engines were built with intake valve springs that could fail. This failure can cause significant damage to the engine. New intake valve springs will be installed.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11029643-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11029643-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11029643","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"PACCAR","model":"MX-13","year_from":2021,"year_to":2021,"match":null,"vehicle_ids":[]}],"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":[]}