rpm605
Member
Boat is 2019 240 BR with the Merc 6.2/350HP. Engine temp has always topped out at 150 at idle as well as at speed. Just Changed the thermostat as part of regular maintenance at the 190 hour mark. This will be an every other year item for me. The boat now holds 150 degrees at cruising speed, but temp goes up to 160 at idle. Is this acceptable? Merc Part 8M0089715. 140 degree stat