NHTSA campaign 15V293000
Hazard
Blue Bird Body Company (Blue Bird) is recalling certain model year 2009-2016 All American rear engine school buses manufactured December 7, 2008, to May 11, 2015, and equipped with certain Cummins Westport ISL G engines. Excessive engine crankcase pressures may cause the 90-degree elbow of the vent tube assembly to detach from the crankcase ventilation breather, possibly allowing engine oil to come into contact with hot surfaces.
Consequence
If engine oil comes into contact with a hot surface, there is an increased risk of a fire.
Remedy
Cummins will notify owners on behalf of Blue Bird, and Cummins service centers will administer the repairs which include securing the ends of the 90-degree elbow and reprogramming the electronic control module (ECM) with software that can adjust the engine output under misfire conditions to limit crankcase pressures. These repairs will be performed free of charge. The recall began on June 12, 2015. Owners may contact Blue Bird customer service at 1-478-822-2242 or Cummins Inc. at 1-800-343-7357. Blue Bird's number for this recall is R15YE-SB.
The text above is quoted verbatim from the NHTSA record. Confirm the affected units and the remedy with the manufacturer or NHTSA. Recall data may be incomplete, delayed, or superseded.