99 Honda How to fix loose engine bolt

Pic attached:
How do I fix/replace the loose bolt on the engine? I don't want to have to open the seal unless absolutely necessary. What is the bolt called? What tools do I need? Its a 99 Honda civic body but the engine came off a 94 (not so sure on the year of engine but its between 92-98 acura gsr.

You tighten it down? Either way, there's no photo.

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