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#1
06-05-2006, 05:19 PM
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Re: Prop Size, RPMs, & overheating
I would guess, thermostat as well, sometimes they get clogged with sand and seaweed. The way to best check to make sure they are opening at the right temp is to remove them from the engine, and put them in a pot of water at about medium temp. With a cooking thermometer monitor the temp and around 140 or so check them to see if they open. you will have to take them out of the water momentarily to check the gap. Hopefully this helps.
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#2
06-09-2006, 12:07 AM
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Re: Prop Size, RPMs, & overheating
I would also be concerned that you only get 5K out of a 225 with a 15" prop, that thing should swing a 17 easy.
__________________
Any way you measure it - dumbass is expensive
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#4
06-12-2006, 12:10 PM
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Re: Prop Size, RPMs, & overheating
The prop will get about 5800 rpm. I was hitting a wall at 5k because that's when the computer would start dropping RPMS due to the over heating problem. From a cold start I was able to get them up higher.
I've changed the thermostats & poppet valve (still not sure what this does). Haven't done the pump/impeller yet but it's looking like that's gonna be next. There's not much more I can do while it's in the water and I can't get it out until high tide late Sunday afternoon. Right now I'm selling the bunk trailer that I have for it to get something with brakes on both axles. Considering that I don't trailer much, and that everyone says the bunks are better for the hulls, I was planning to stick with the bunks but I'm not sure now. In the event something happens and I need to get it out of the water on short notice, I don't want to be worrying about the tide.
__________________
1973 23' Tsunami, 300hp Etec Norwalk, CT
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#5
06-12-2006, 02:34 PM
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Re: Prop Size, RPMs, & overheating
Poppet - is a spring loaded water pressure relief valve.
This is a nice little diagram of merc's cooling system. I don't think the cooling on the 225 is much different. 
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#7
06-13-2006, 10:20 PM
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Re: Prop Size, RPMs, & overheating
With the new poppet assy and stats not fixing the problem, I would suspect the impeller also, maybe not reassembled correct, or bad base gasket,pilot tube and gasket not sealing or blockage (from old impeller coming apart?) in water tube going into the block. If you are getting hot enough for it to slow down, you are asking for trouble.Take a look at this article w/pictures. A little dish soap makes the impeller go in easier.
http://www.in-depthangling.com/forum...5/o/93/fpart/1
__________________
Gary
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