{"nhtsa_id":10085761,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2016-12-08","date":"2015-11-17","document_id":"TSB150040-032315","mfr_campaign":null,"replaces":null,"component":"ENGINE; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:BELTS AND ASSOCIATED PULLEYS","mfr_system":null,"summary":"THIS TECHNICAL SERVICE BULLETIN DESRIBES THE TROUBLESHOOTING AND REPAIR STEPS TO CORRECT BELT TENSIONER LOCATING PIN MALFUNCTIONS AND BELT SHREDDING ON CERTAIN ISB ENGINES IN THOMAS PUSHER SCHOOL BUSSES. ORIGINAL EQUIPMENT MANUFACTURER (OEM) INSTALLATION OF INCORRECT BELT SIZE IS SUSPECTED TO BE THE ROOT CAUSE.","document":null,"url":"https://open.wenmarpro.com/bulletins/10085761","components":[{"id":"engine","name":"Engine","parent":null},{"id":"drive-belt","name":"Drive belts","parent":"engine"}],"codes":[],"topics":[],"vehicles":[{"make":"CUMMINS","model":"ISB6.7","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":[]}