View Full Version : Correct Operating Temperature

07-24-2007, 07:17 PM
I'm wondering if my boat is operating at the correct temperature? It is a 1996 w/o LT1 (I think the 350 TBI was the engine?). It only reaches about 130 according to the temp. gauge, which is about the 1/4 mark on it. However, it reaches this temp. and holds rock steady so maybe I'm wrong that it should be closer to 160? I read on skidim that 160 degrees is a better operating temp. due to fuel atomization and so I'm wondering if I should order a new thermostat?

07-24-2007, 08:27 PM
130 doesn't sound right to me. Mine runs at about 150 to 155. Could be the gauge also. Take the sending unit out and put it in some hot water, check it with a thermometer, and see what the gauge says. If it is good then order the thermostat. That would be my guess anyway.

07-24-2007, 09:25 PM
130 is definately low. The stock thermostat is a 143 I believe which typically runs in the mid 150's. You can also run a 160 degree thermostat which will operate closer to 165. I would bet it is stuck in the open position.

07-24-2007, 09:29 PM
I agree...my old Century I/O (350 Yamaha drive) would run about 130 with the thermostat completely removed, and ran 150 with a 140-degree thermostat in it, which is what the manual specified. My MasterCraft sits rock steady at 160 at all times while running.

07-24-2007, 09:37 PM
Ok thats pretty much what I expected. I'll heat up some water and check the temp. sender, but for the cost I'm sure I'll just replace the thermostat since I was assuming that the thermostat is stuck open.