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Reload this Page 2004 Tohatsu 25hp...calling all mechanics

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  #1  
Old 07-21-2013, 07:05 PM
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Shawn Braquet Shawn Braquet is offline
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Default 2004 Tohatsu 25hp...calling all mechanics
Motor started overheating during duck season, I changed the impeller and never run it. Went to run it the other day and same problem. Checked the water jacket and its free, even tried shooting water and 100psi air through pisser line backwards then checked pickup for trash with no luck. First questions any Tohatsu gurus in Sulphur, Lake Chuck area...and second what is this bolt/plug for under the cowling...third how do I pull this damn motor off the prop shaft/cowling/lower unit? Thanks
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  #2  
Old 07-21-2013, 07:24 PM
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davidkyle323 davidkyle323 is offline
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Check thermostat
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  #3  
Old 07-21-2013, 07:55 PM
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Quote:
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Check thermostat
X2
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  #4  
Old 07-21-2013, 07:58 PM
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If the thermostat fails, won't it open too soon and keep the motor from warming up when cold?
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  #5  
Old 07-21-2013, 08:21 PM
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Shawn Braquet Shawn Braquet is offline
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Was thinking that I was told before that it doesn't have a thermostat...if that isn't the case where is it?
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  #6  
Old 07-21-2013, 08:35 PM
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I have an '02 15hp tohatsu & it has a thermostat
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  #7  
Old 07-21-2013, 09:49 PM
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Just found a different diagram and it shows a thermostat, I'll check it this week
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  #8  
Old 07-21-2013, 10:08 PM
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If the thermostat fails, won't it open too soon and keep the motor from warming up when cold?
The thermostat could be open but clogged with trash.
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  #9  
Old 07-21-2013, 10:20 PM
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Shawn Braquet Shawn Braquet is offline
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The thermostat could be open but clogged with trash.
Grass/mud mixture knowing what I was running through
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  #10  
Old 07-21-2013, 10:24 PM
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Also the thermostat could be bad and not opening at all.
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  #11  
Old 07-22-2013, 12:02 AM
Gerald Gerald is offline
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If the thermostate is really dirty, a water hose will get most of the "crud" off.

But to really clean it.....boil it. You will be supprised at how much more stuff comes loose when the thermostate opens. It should start to open [~ 190 F] when little bubbles start to form in the pot.
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  #12  
Old 07-22-2013, 05:15 AM
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Montauk17 Montauk17 is offline
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Gut the thermostat and let that baby flow! Cut the guts off the backing plate with some cutting pliers and install the backing plate back in the housing. Had a 25 merc I would pump straight mud through it and would not overheat. To me a thermostat is useless on a 2 stroke outboard in south louisiana.
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  #13  
Old 07-22-2013, 06:49 AM
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I am running a merc 225 pro max and I don't have either the thermostats or popping valve in it.
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  #14  
Old 07-22-2013, 08:28 AM
scott craft scott craft is offline
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Cajun Christian is very good with those Tohatsus. That's who I would want to look at it if it was mine.
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