Boat is a 1990 Bayliner Ciera 2651 with Mercruiser 5.0 LX/V8 Alpha One engine. Engine runs at 150 to 160 temp when crusing above 10 miles/hr. But when at idle or at low "no wake" cruising speeds the boat starts to overheat. A Bayliner mechanic instructed me to change water impeller. I did...
