Thomas Built · Canada · Crit
Thomas Built Saf-T-Liner C2 School Bus, Mvp-Ef School Bus +1 more: Engine
Affects Thomas Built Saf-T-Liner C2 School Bus, Mvp-Ef School Bus, Saf-T-Liner HDX School Bus · 2011–2012 — about 400 vehicles.
The hazard
On certain school buses equipped with a Cummins engine, the V-band clamps used to connect the inlet and outlet cone sections to the Diesel Oxidation Catalyst (DOC) / Diesel Particulate Filter (DPF) include a T-bolt which can fracture and fail when subjected to stress or load. A fracture or failure of the T-bolt may cause the clamp to loosen and the inlet or outlet sections attached to the DOC/DPF housing to disconnect. Should this occur, hot exhaust gases can vent prior to exiting the tailpipe, creating a risk of combustion or damage to adjacent materials, which could result in a vehicle fire. If both clamps fail, the DOC/DPF housing could detach completely, separate from the vehicle, and strike another vehicle, stationary object, or bystander. These issues could result in property damage and/or personal injury. Correction: Cummins will install updated V-band clamps.
What to do
Contact your dealer; the remedy details were not included in the filing.