CUMMINS CUMMINS ISB6.7 Recall
Check Your Product
According to the National Highway Traffic Safety Administration (NHTSA)
Product
CUMMINS ISB6.7
Brand
CUMMINS
Lot Codes / Batch Numbers
Not specified in NHTSA notice. Check official source for details.
CUMMINS INC. is recalling certain CUMMINS ISB6.7 equipment due to engine and engine cooling:engine:diesel issues. If this occurs, the fan belt may lose engagement of the water pump, allowing the cooling system to overheat. This may result in exceeding temperature .
Summary derived from NHTSA notice
Reason for Recall
As stated by NHTSA
Cummins is recalling certain model ISB6.7 diesel engines manufactured from February 16, 2010, through May 4, 2012, equipped with fan pulley Part Number 3914462 and installed on certain Thomas Built Buses, Inc. school buses. The subject fan pulley is part of the accessory drive system on the front of the engine. This system is used to drive such components as the refrigerant compressors, the radiator fan, and the engine water pump. The web of the pulley can fatigue over time, causing the pulley to fail.
Reported concern (NHTSA)
If this occurs, the fan belt may lose engagement of the water pump, allowing the cooling system to overheat. This may result in exceeding temperature limits, potentially disabling the school bus. If the school bus is occupied when it becomes disabled, the occupants would need to exit the vehicle and be transferred to another vehicle, putting them at risk of injury.
Recommended Action
Per NHTSA guidance
Cummins will notify Thomas Built of this defect and the potential safety consequences, and will work with them to identify and notify the affected owners. Cummins will install a new fan drive pulley, without charge, through Cummins' service network. The recall began on November 27, 2012. Notification to owners began on January 4, 2013. Owners may contact Cummins at 1-812-377-5000.
Verify this information on the official source
For complete details and official instructions, check the National Highway Traffic Safety Administration (NHTSA) directly.
View official NHTSA recall noticePage updated: Jan 10, 2026