{"nhtsa_id":634181,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-09-28","date":"2002-06-25","document_id":"P1550","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE:DIESEL","mfr_system":null,"summary":"SUBJECT REGARDING J-TECH ACTUATING PIN ADJUSTING SCRE REPLACEMENT, ENGINES AFFECTED - ALL E-TECH ENGINE MODLES MANUFACTURED ETWEEN JANUARY 2002 THROUGH MARCH 2002 (ENGINE SERIAL NOS. 2A0001 THROUGH 2D2687). NLM","document":null,"url":"https://open.wenmarpro.com/bulletins/634181","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"MACK","year_from":null,"year_to":null,"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":[]}