Hi, I have a 1991 Sierra 2ltr DOHC, a bolt has punched a hole through the lower front cover plate close to the pulley wheel???
I have recovered it and repaired the hole,changed oil/filter and the car seems to be running fine(for now).
Can some one please tell me where this bolt came from??
I have attached link with a photo of the bolt next to a penny.

Any help would be greatly appreciated

Zuzana