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#1
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It should be running hotter than 120 at idle and lower rpm. It sounds like a thermostat issue
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#2
08-20-2013, 11:50 AM
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Thermostat Issue
Does anybody know which way the thermostat drops in?
I have the older 470 with iron manifolds. I installed the thermostat with the springs down. If the thermostat is upside down, I am assuming it will cause a high speed overheat. Thanks for your help...
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#3
08-20-2013, 11:59 AM
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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.
__________________
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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#4
08-20-2013, 12:18 PM
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Spring facing the heated water
Then that tells me my thermostat is installed upside down.
The heated water is on top from the engine - the spring should face up in that case. Another thread showed the exact same thing. When the person fliped the t stat, everything ran great.
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#6
09-10-2013, 09:09 PM
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my advice would be remove thermostat and try it see if it over heats
A easy way to check for a head gasket leak or cracked head (1) you need 4 long screwdrivers (2) connect hose to engine and run it till its hot (3) remove all 4 spark plugs (4) place a screw driver down each spark plug hole (5) wait a minute remove a screw driver one at a time and check for moisture of the screw driver (6) if you find one with moisture that's the cylinder that's leaking I have been using this method since I have been in the trade it works
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#7
09-10-2013, 10:04 PM
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Pulled the head
I already pulled the head off and took it to a machine shop. He showed me the area he thinks the head gasket was leaking and he thinks it is causing the overheat.
I will be putting everything back together later this week and test rid is scheduled for Sunday...I will keep you posted.
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