auto-mechanic, automobile mechanic, car-mechanic, grease monkey, mechanic - someone whose occupation is repairing and maintaining automobiles

handyman, odd-job man, jack of all trades - a man skilled in various odd jobs and other small tasks

mender, tinker, tinkerer - a traveling repairman who mends broken things (such as metal household utensils)

skilled worker, trained worker - a worker who has acquired special skills

trouble shooter, troubleshooter - a worker whose job is to locate and fix sources of trouble (especially in mechanical devices)