The spring should be facing the heated water.
A simple test to see if your t-stat is working properly: Take your stat and put it into a saucepan full of water. Bring the water to a boil. Remove the stat with a pair of tongs and look at it. Make sure it's fully open. Then, put a piece of string into the opening that occurred when the spring retracted due to the heat. Let the stat cool and capture the string. Then place the stat, suspended by the string, back into new, cool water and bring it to a boil again. Using a candy thermometer, measure the temp of the water as it's heating up. When the spring opens and the stat drops off the string look at the thermometer reading. That will tell you exactly what temp your stat is opening at. Check it against the reading stamped on the stat housing to see if it's within specs.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
Last edited by Destroyer; 08-20-2013 at 12:10 PM.
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