Your tow-sports inboard—or any inboard—requires regular maintenance if it is to deliver long life and good performance. Seasoned boat owners know to make recurring assessments part of their routine.

QUESTION: I have a boat powered with a 5.7 liter V-8 inboard engine. The crankcase hoses that go from the top of the valve covers and vent into the carburetor are always blowing steam. The engine has ...