The defect
Daimler Trucks North America (DTNA) is recalling certain model year 2011 through 2013 Thomas Built non-school buses manufactured from March 2010 through July 2012, equipped with Cummins ISB6.7 diesel engines manufactured from February 16, 2010, through May 4, 2012, containing a fan pulley, part number 3914462. 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.
The risk
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.
The remedy
Cummins will notify owners of the recall. Repairs will be performed by Cummins authorized service facilities. A new fan drive pulley will be installed free of charge. The safety recall began on January 4, 2013. Owners may contact Cummins at 1-812-377-5000 or DTNA at 1-800-547-0712.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Thomas Built Buses SAF-T-Liner C2 | 2011, 2012, 2013 |
Components: ENGINE AND ENGINE COOLING:ENGINE:DIESEL
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Thomas Built Buses SAF-T-Liner C2 | 2011 | 0 | 22 |
| Thomas Built Buses SAF-T-Liner C2 | 2012 | 3 | 16 |
| Thomas Built Buses SAF-T-Liner C2 | 2013 | 1 | 18 |
Other engine and engine cooling recalls in 2012
29 of the 583 recall campaigns reported to NHTSA in 2012 concerned the engine and engine cooling; Daimler Trucks North America filed 32 campaigns in all.
| 12V570000 11 Dec 2012 | Daimler Trucks North America |
| 12V551000 3 Dec 2012 | Ford Motor Company |
| 12V550000 27 Nov 2012 | BMW of North America, LLC |
| 12V477000 1 Oct 2012 | LOTUS CARS USA, INC. |
| 12V475000 28 Sept 2012 | BMW OF NORTH AMERICA, LLC |
| 12V476000 27 Sept 2012 | NAVISTAR, INC |
| 12V473000 27 Sept 2012 | NAVISTAR, INC |
| 12V469000 25 Sept 2012 | THOR INDUSTRIES |
NHTSA recalls (public domain) · all recalls of 2012