If the engine still runs noise, rattling, rough misfiring NO power etc. Chains don't break for less likely than a BELT, but they do get loose (altering timing of engine components) and will stop or destroy an engine, If allowed to wear to beyond there limit. Regards
Auto is right, a chain has no teeth too break, only timing belts have teeth, and if the teeth do shear off, then engine damage can result just as if it broke.
The Cobalt is a timing chain engine and also an interference engine, so if anything happens to the timing chain or it's componets valve and or piston damage can result. Hope this answers your question.
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