In order to complete additional instruments in my boat I want to add a thermometer which will monitor engine temperature and alarm when it overheats. Outboard I have is Tohatsu 40 HP which is, of course, water cooled, and only indication that cooling is working is a thin stream of water on the back side.
This can be a problem, since you can't have an eye on the water stream during cruising. So a small thermometer with audible alarm when temperature exceeds the limit will do the job.
First, thermometer position needs to be determined. It should be the hottest place on the engine, yet accessible to install the sensor.
Assumed hottest spots are engine cylinder and the head. Since thermal imager is at hand I took some photos which clearly reveal hot spots. Photos were taken after 45 mins of cruising at half throttle power. Maximum temp. is at the middle of the cylinder and equals 55 °C.
Thermography revealed hottest engine points, and the chosen point for thermometer is engine head fixation bolt. One of the bolts will be replaced with the new, machined one which will have a drilled hole in its head. One digital ds18b20 sensor will be inserted into that hole.
All I need to do now is to make the thermometer :).
I'll keep this post updated with making progress...
This can be a problem, since you can't have an eye on the water stream during cruising. So a small thermometer with audible alarm when temperature exceeds the limit will do the job.
First, thermometer position needs to be determined. It should be the hottest place on the engine, yet accessible to install the sensor.
Assumed hottest spots are engine cylinder and the head. Since thermal imager is at hand I took some photos which clearly reveal hot spots. Photos were taken after 45 mins of cruising at half throttle power. Maximum temp. is at the middle of the cylinder and equals 55 °C.
Thermography revealed hottest engine points, and the chosen point for thermometer is engine head fixation bolt. One of the bolts will be replaced with the new, machined one which will have a drilled hole in its head. One digital ds18b20 sensor will be inserted into that hole.
All I need to do now is to make the thermometer :).
I'll keep this post updated with making progress...
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