Correct thermostat direction?

[webnetxpress]

installing a new thermostat in my 85 mercruiser 170hp, 3.7L/4cyl. Have a question in regards to the direction i should mount the new one...<br /><br />According to the diagram, the thermostat looks like it's mounted pointed upwards. I am 99% certain the one I pulled out was mounted facing downwards.<br /><br />my thermostat installation diagram looks like:<br /> http://www.webnetxpress.com/tinstall.jpg <br /><br />and the actual thermostat looks like:<br /> http://www.webnetxpress.com/thermostat.jpg <br /><br />So, which way is correct? My thermostat housing goes on from the bottom of the exhaust manifold and bolts upwards into the manifold. A tube goes into the bottom of the mount.

 

[J.J.W]

Re: Correct thermostat direction?

I would put it the way Mercury shows it. Most thermostats have a side that is marked "To Radiator" or "To Rad" That is the side you want up, because the heat exchanger is your radiator.<br />Justin<br />justin@sterndrive.cc<br />www.sterndrive.cc

 

[webnetxpress]

Re: Correct thermostat direction?

excellent, thanks. i saw that marking on it, but wasn't sure what would be considered the "radiator".

 

[TwoBallScrewBall]

Re: Correct thermostat direction?

The side with the spring goes in the engine. That way the engine water heats it direcly. Easiest way to remember.