[hiccup]

Nothing magical happens at 1,000 hours. If the engines are in good condition and have been properly maintained they will last a long time. It is typical for engines to receive a major service at around 1,000 hours. Typically referred to as '1,000 hour service', however even that is typically overdone by diesel mechanics so they can send their kids through college.

If you have questions about the engines in a boat you're considering purchasing (which you should), then you should hire a mechanic to inspect the engines and listen to his advice. This would be separate from a boat surveyor.