{"nhtsa_id":10238840,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2023-07-07","date":"2023-06-29","document_id":"ATC2666A","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING","mfr_system":null,"summary":"This ATC is being issued to replace B6.7G CMOH6.0 E5 cylinder head in certain King Long buses operating in Mexico that could present low cylinder compression due to valve or valve seat leakage. This ATC authorizes approved service locations to replace the cylinder head where appropriate. Please review the qualifying parameters below before beginning any work. The new replacement cylinder head contains a valve rotators.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10238840-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2023/MC-10238840-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10238840","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"B6.7","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":[]}