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    Mercruiser 305 V-8 Temp issues

    Great idea. Thanks.
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    Mercruiser 305 V-8 Temp issues

    While I had the exhaust manifolds and risers off, I did check the flappers, they were in good shape. I suppose it is possible when I put the upper back on I missed the water tube. This is the first time I have ever seen something like that. Well like I said earlier, OEM only from now on...
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    Mercruiser 305 V-8 Temp issues

    Field UPDATE: Here's where I am at. All new exhaust manifolds, risers installed. All lines are clear to the lower unit. New water circulation pump installed. I have the thermostat pulled and rebuilding. Amazon sent me two new ones that were completely destroyed and missing parts. Another...
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    Mercruiser 305 V-8 Temp issues

    Does anyone have the actual break down of the water pump in better detail than a parts diagram? Or a link to a video that shows piece by piece assembly. I am pretty sure I have an MR- here but I want to make sure I am using the right gaskets. I think I didn't install #34 on the parts diagram...
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    Mercruiser 305 V-8 Temp issues

    I did verify the 180 at the housing. I am really not sure what gremlin I am chasing. I guess I am still looking for a blockage somewhere between the hull and the exhaust. I will be pulling all the hoses off to verify they are all clear, I will pull the thermostat housing off, and tear it...
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    Mercruiser 305 V-8 Temp issues

    As I think about things. When I removed the exhaust manifolds, the starboard side bolts were all super loose. Like I didn't need to really put any pressure on the wratchet to get them out, same thing on the other side, with exception of the bolt where the rust was at, that one was rusted in...
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    Mercruiser 305 V-8 Temp issues

    I have the 140 thermostat.
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    Mercruiser 305 V-8 Temp issues

    This begs the question. What is the proper running and operating temp of this Mercruiser engine. I don't see one in the book. I didn't think 180 was an overheat, just running hot.
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    Mercruiser 305 V-8 Temp issues

    This crossed my mind, how would I go about looking at this, without pulling the heads.
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    Mercruiser 305 V-8 Temp issues

    Not sure why I would get so much corrosion in that spot, so badly like that. I was looking for a diagram of my thermostat, as I never took it off to inspect it for any blockages, just took out old thermostat and put new one in. I attached the diagram of the thermostat for reference. I also...
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    Mercruiser 305 V-8 Temp issues

    I replaced the whole water pump and seals, last year. I will take all the hoses off and check those for blockages
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    Mercruiser 305 V-8 Temp issues

    Top of risers under rubber looked good, not nearly as rusty as I thought they would. Just rust stained, no major flaky rust. Checked the flappers and they were all good. This boat has always been in Freshwater.
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    Mercruiser 305 V-8 Temp issues

    Want to see what everyones thoughts are. My boat runs 180 to 200, up and down. I typically troll and it remains at 180, sometimes it creeps to 200, but goes back down. If it doesn't I give it a little throttle, and it drops down. Cools rapidly to 160 when wide open for a cruise, but then...
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