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    Mercruiser 5.0 Won’t Reach Operating Temp

    I will do both of those and get back to you. I’m also going to make sure I didn’t mess up the gasket on the thermostat placement. Thank you in advance.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Confirmed. It wasn’t until recently that the engine wouldn’t get up to temp and replacing the thermostat did not fix it while under load.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Motor Serial Number OM663009. Thanks for the reply!
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    Mercruiser 5.0 Won’t Reach Operating Temp

    I have a 2007 Mercury engine that I just replaced the thermostat in since it wouldn’t reach operating temperature. It reached 160 just fine in the driveway but won’t get past 120 under load on the water still. What else could be causing this issue?
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