{"nhtsa_id":53639,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1998-03-30","date":"1997-10-01","document_id":"97100197210","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:ENGINE","mfr_system":null,"summary":"INFORMATION REGARDING POLYGON HUB REMOVAL. *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/53639","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"VOLVO","model":"VOLVO TRUCK","year_from":1996,"year_to":1996,"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":[]}