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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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    Mercruiser 200HP 305 CID V-8 Normal Operating Temperature

    I have the service manual for this engine. NO where in the service manual or anywhere on this forum, am I able to find normal operating temperatures for this engine, or something similar. Here is the question. What are considered normal operating temperatures for a 140 thermostat and a 160...
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