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    Mercruiser 200 V8 Alpha 1 MR Drive

    Getting antsy for the salmon season, so I started to pull my lower to put a new water pump in. And, the plastic tube that helps line up the water intake was melted. Looked up into the top half, and the water pocket had signs of heat/some melt from the outside. Gasket was okay and seal were...
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    Much appreciated. Confirmed I do have the 140 thermostat.
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    River is 48, lake is 40.
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    Honestly when I bought the boat, it had a new T stat setup in it. Based on the Serial number of the engine, I can never find anything about the engine on any parts sites. The boat is a 1987 so I buy parts for it based on that year range. The serial sticker says: A612838
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    Thanks for everyones input. Went and fired it up let it warm up at dockside for 20 minutes, temp never went past 170. Took it out for another hour. Temp hit 180 once, then came back to 170. To it back to the dock and let it idle another 15 minutes, stayed at 170. I went all speeds, but since...
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    Found this serial number A612838
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    I just noticed that Diagram one does not show the T valve balls, which mine has. Top of my thermostat is marked 47440
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    No Alarm, not even sure where I would hear it from, or where it would be wired. Engine SN# 0A688183 My Thermostat Looks like Design 1, so I didn't use the rubber 0 ring. Design 1 shows gasket on top of Thermostat, is that where the black 0 ring should go? between top of thermostat and copper...
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    This leads me to: hose from the bellhousing to the gimbal housing. How do I check this for obstructions and or kinks??
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    I used the Cork Gasket on top of the thermostat with the copper piece on top of that. I followed the diagram on the parts diagram.
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    The alpha pump will push just under 20 gpm. The pump deadhead pressure is about 20psi However as Bt doctur stated, At what RPM is it pushing this flow?
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    Did some tests. Here is what I found. First I ran the engine with the raw water line off the thermostat. Water was flowing at idle Lots of water with throttle. I pulled the line off the PS oil cooler, checked flow same results flow at idle and lots at throttle. I checked the cooler for...
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    I used Mercury parts from my marina. Water pickup tube looked good. Not sure how I would check if it is sucking air around the water pocket, so I am unsure. Gen One
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    1 week ago, along with thermostat. I did not replace the water pump base, just impeller plate and gaskets
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    The only reason I keep thinking circulating pump is how quickly the temp drops at high RPM, plus the boat is 1987, I imagine it's the original, and I am hoping for something easy. What are the symptoms of a faulty circ pump? I am heading over after work to try to troubleshoot some of these...
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    Thanks for the welcome. I know my springs are rusted, How tight are they supposed to be, can you over tighten them, or under tighten them, my manual doesn't really say anything about it
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    I have it winterized by a marina. So I don't know how they do the cooler. I will try the clear hose. I Have an IR Temp gun, but what am I looking for exactly, hot spots? I will have more info after I do some testing tonight. Thanks
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    Mercruiser 305 V8 running hot at low RPM fine at Speed

    New Impeller, water pocket is good. New Thermostat 140 degree, installed correctly. New temp gauge, did not install the new temp switch. Hit the fresh water lake while making my way out to the lake the boat temp was about 180, over about 30 minutes it started to creep up to 230. Give it some...
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    Mercruiser 200HP 305 CID V-8 Normal Operating Temperature

    Thanks for the Reply. Your water pocket cover comment stuck out. Why would you think that is bad? When I dropped the lower, the pipe was in place, and I replaced the whole housing, gaskets and impeller. Things went back in very smoothly. It changed my idle and trolling temps back into the...
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