I have just installed an engine interface and a water pressure sensor to my Command Link equipped Yamaha F150. I have earlier noticed that during hi-speed cruising and at WOT the temp bar on the tachometer raises to the second to last bar on the tachometer. Now with the interface I can see the temp in numbers and at normal cruising speed 3500 - 4000 rpm the temp is around 185 - 195?F and at WOT it raises to 230?F. According to the service manual this is well above the temp for the alarm to go off.
I have noticed that the switch for the alarm is on the thermostat housing and the sensor for the meter is on top of the engine so I guess the meter does not sense the cooling water temp as is usual in cars. My water pressure is 8 psi at cruising speed and 10 psi at WOT, at WOT the tachometer bar for water pressure is on the last bar and at cruising on the second to last bar so I guess this is normal. What is to be considered normal temp values and is it normal that the temp fluctuates so much when the load on the engine varies?
I have noticed that the switch for the alarm is on the thermostat housing and the sensor for the meter is on top of the engine so I guess the meter does not sense the cooling water temp as is usual in cars. My water pressure is 8 psi at cruising speed and 10 psi at WOT, at WOT the tachometer bar for water pressure is on the last bar and at cruising on the second to last bar so I guess this is normal. What is to be considered normal temp values and is it normal that the temp fluctuates so much when the load on the engine varies?
