Marine mechanics are tough dudes, for the most part. Go visit the marinas that are local to you and check out the mechanic certifications on the wall. Mercruiser offers all kinds of training. Dont know the cost of the cert programs, but i am sure they're not cheap. Furthermore the. Boating market has been in a recession since 1999. I am certain that for every person that is making it inmarine engine repair, there's probably 20 that failed.