Thermostats WHY ???

fishon71

Chief Petty Officer
Joined
Jul 21, 2002
Messages
575
What is the reasoning behind putting thermostats in small outboards 8 -20 HP all they do for me is get stuff using in salt water.<br /><br />Do I really need to have one installed?
 

summers1996

Seaman Apprentice
Joined
Nov 2, 2005
Messages
30
Re: Thermostats WHY ???

Thermostats are designed to bring an engine up to opperating temp at a controlled rate. Once the opperating temp is correct the T-stat will keep it at the proper opperating temp. If the T-stat is removed or not closing properly, the engine will run too cool. If the engine is running too cool... the metal parts (pistons, cylinder walls, head etc.) have not expanded to their proper opperating deminsions and the engine will wear out very quickly. Starting an engine is the single bigest cause of wear over the life of the engine, cars and boats alike. Without a thermostat, it's like running the engine in start up mode all the time. Death will come soon. As far as salt water goes... Flush the engine better and keep a supply of T-stats arround, their cheap.
 

Texasmark

Supreme Mariner
Joined
Dec 20, 2005
Messages
14,880
Re: Thermostats WHY ???

I bought a 3 year old used engine (freshwater use only). It overheated. The stat was stuck closed. I discarded it. I wasn't worried, outboard motors have been running for 40 years without them; why should I need it now was my reasoning.<br /><br />Well, things are different today; fuel makeup, leanburning engines (EPA) and all, so engines are more critical than before.<br /><br />I bought and installed a new stat and there was a marked improvement in the performance of the engine. Mine will stay. The thing was only $8 bucks on this site. <br /><br />For that price I could change it annually and not be bothered.<br /><br />Mark
 

deejaycee_2000

Captain
Joined
Mar 28, 2006
Messages
3,447
Re: Thermostats WHY ???

I also thought i didn't need one but realized it is there for a reason ...
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: Thermostats WHY ???

If you troll, you need it. Otherwise you get tons of brown foamy crud out of the exhaust.
 
Top