Johnson 30hp-head temperature

[nordy]

Hello,<br /><br />the thermostat of my engine is a 143 °F => 62°C-type.<br /><br />Does anyone know how high's the avarage temperature of the cylinder head under normal conditions ?<br /><br />I suppose the 143 ° spec means the thermostat opens for about 1 mm or so with 62 ° Celsius.<br /><br />Greetings from Germany<br /><br />Nordy

 

[steviecops]

Re: Johnson 30hp-head temperature

Hello Nordy<br />I don't know about your engine, but on my 55 hp Johnson the top of the head gets up to 63 degrees C, or about 145 degrees F, at idle.<br /><br />I monitored it with a heat sensor after replacing my thermostat and poppet valve. At this temperature, it was almost too hot to touch for more than a second.<br /><br />I think I remember the hot alarm goes off at about 211 Degrees F, from when I tested it as per the manual.<br /><br />Hope this helps.<br /><br />Steve