I was idling while talking with a friend in another boat and noticed my exhaust was a little colored. So glancing at the dash, the temp gauge was almost pegged at 240F. Quickly shut off the engine and opened the engine compartment. The coolant hose had collapsed, flattened, so very little water was going into the engine block. After waiting a few minutes, the hose reformed itself and i cranked the engine back up and it went back down to the normal 160F. The engine ran fine after that.
This week I'm replacing all of the coolant hoses, but my question is, what would cause the hose to collapse into itself? and what possible damage might have occurred even though its running fine now?