{"nhtsa_id":613561,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2000-07-21","date":"2000-04-18","document_id":"SB212023","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"SUBJECT REGARDING PISTONS USED IN E7 ENGINES MANUFACTURED PRIOR TO 1991 ARE A ONE-PIECE ALUMINUM DESIGN WHILE PISTONS USED IN 47 ENGINES MANUFACTURED AFTER 1991 ARE A TWO-PIECE STEEL-TOP DESIGN. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/613561","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"E7","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":[]}