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03 SD Engine Temp Range 350 mag mpi

3.7K views 9 replies 5 participants last post by  SeaRay240  
Actually, my 240 with the 350 Mag always ran between 165 and 180. It always ran hotter at idle, about 175 to 180. When I was at cruising speed, with the water really running, it would run closer to 165.

Check the thermostat if you can't get it up to temperature, maybe part of the impeller is keeping it open. But you want the engine running in it's optimal temperature range.