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  #1  
Old 03-21-2005, 08:04 AM
skilew skilew is offline
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Stuck Thermostat Cover

Engine acts as though the thermostat is stuck open. Will not get over 120 degrees F so I decided to replace it.

Tried to replace thermostat this weekend, removed the two cover bolts but the cover acts as though it were welded on. It will not budge. I did not want to be too aggressive and crack the cover. Any suggestions?

Last edited by skilew; 03-21-2005 at 08:12 AM.
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  #2  
Old 03-21-2005, 08:12 AM
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jsonova99 jsonova99 is offline
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Could you try heating it up a little with a heat gun or something? That little bit of expansion might be enough to knock it loose. I can't picture what mine looks like right now so I don't know if this is feasible or not. I'm sure somebody else will chime in with some ideas.
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Old 03-21-2005, 08:18 AM
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I had a similiar problem in my '88 with the thermostat, and the cover was seized a bit as well. Here's what I'd do. Squirt some PB Blaster down the bolt holes, and around the seams of the cover. Tap it gently with a hammer, or rubber mallet. Repeat, then pull it off.

Once you access the t-stat, if you notice it OPEN, that explains your temperature problems -- mine was corroded wide open. Let us know how it goes.
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Old 03-21-2005, 08:30 AM
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You said you removed the "two" cover bolts, I believe your are removing the wrong cover. Doesn't the t-stat houseing have 3 bolts holding it together? You are probably removing the neck into the manifold and the stat is in the other housing.
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Old 03-21-2005, 10:12 AM
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Lew,
I can't tell what kind of boat you have but my engine (LTR) has a 120 deg. thermostat as standard equipment.
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  #6  
Old 03-21-2005, 11:17 AM
jimmer2880 jimmer2880 is offline
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Quote:
Originally Posted by Footin
You said you removed the "two" cover bolts, I believe your are removing the wrong cover. Doesn't the t-stat houseing have 3 bolts holding it together? You are probably removing the neck into the manifold and the stat is in the other housing.
I have to agree - on my '95 PS190, it's 3 bolts holding the cover on the T-stat. What boat do you have?
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Old 03-21-2005, 11:54 AM
Lance Lance is offline
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My 87 prostar also has three. The cover is the triangular shaped housing at the very top front of these older Ford engines.
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Old 03-21-2005, 12:54 PM
skilew skilew is offline
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I have a 1993 Ford 351 with the GT-40 heads.

It sounds like I may have missed a bolt only saw two but will recheck today. I am removing the cover that has the three hoses going to it. Is this the right cover for the thermostat?
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Old 03-21-2005, 12:58 PM
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I don't think you have the correct cover. Should be top left front side triangle in shape.
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Old 03-21-2005, 01:24 PM
Lance Lance is offline
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Should only have two hoses going to the cover... the two hoses go to the exhause manifold (right & left).
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