thermostat

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realtree280

Petty Officer 3rd Class
Joined
Oct 5, 2005
Messages
76
i have a 1980 johnson 15 horse and was told after an overheating problem that i do not need the thermostat, and would never overheat again if i dont use one , please help with this i would like to hear lots of thoughts on this also this is the motor i am going to rebuild starting this weekend
 
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Brew2

Chief Petty Officer
Joined
Jan 12, 2004
Messages
427
Re: thermostat

I'm definitely no expert, but I would think that by removing the thermostat, you may not overheat, but you are also going to be running your engine too cold a lot of the time. Performance of the engine, especially at idle, would suffer I would think.<br /><br />Why not just put the proper thermostat in and then replace it every few years as a maintenance item?<br /><br />Good luck.<br /><br />Brew
 
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Tom Scully

Petty Officer 2nd Class
Joined
Oct 14, 2003
Messages
154
Re: thermostat

You do need the thermostat, the engine needs to get up to the proper operating temp inorder to run efficiently. You will also have excess carbon build up when operating at a low temp.
 
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realtree280

Petty Officer 3rd Class
Joined
Oct 5, 2005
Messages
76
Re: thermostat

well that makes more sense i have been running this way all summer and it was very cold natured, water comming out the pee hole was always cold,could i have hurt anything running like this ?
 
OBJ

OBJ

Supreme Mariner
Joined
Dec 27, 2002
Messages
10,161
Re: thermostat

As the other guys posted realtree....you risk carbon build up and maybe sticking rings. You also run the risk of a cold sieze which can effect the engine the same way overheat does.<br /><br />Put the correct t-stat in it and do a decarb afterwards. 9.9/15's are tough little engines that will take a beating and keep going. But why beat them if you don't have to.... :)
 
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realtree280

Petty Officer 3rd Class
Joined
Oct 5, 2005
Messages
76
Re: thermostat

thanks obj any other advice you may have for my rebuild of this motor will be great plan to put new pistons and rings and all bearings so far
 
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papasmurf

Petty Officer 2nd Class
Joined
Nov 9, 2004
Messages
181
Re: thermostat

Running a motor without a thermostat can also lead to a motor running hotter than it should. If water flows through a block too fast, then the water will not remove enough heat from the block.
 
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