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    Mercruiser 5.0 Won’t Reach Operating Temp

    I really hope it’s that simple. I’ll give it a shot in the morning and let you know how it goes. Thank you.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Well it wasn’t the impeller (pictured). I know the plate was worn down so I replaced it with the plastic Mercruiser housing, wear plate, and put in a new impeller anyway. I fired it up no problem after the install (had the belt on wrong initially like an idiot but fixed it quickly) and now it...
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    Mercruiser 5.0 Won’t Reach Operating Temp

    It will be here Wednesday - can't find anything in stores around here.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Ok, weird weekend with temperatures - after replacing the thermostat correctly, it got up to temperature and maintained it on muffs and in the water. However, over the course of the day out yesterday, it started dropping in temp again. Got up to 160 at cruising speed and held, but was down in...
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    Mercruiser 5.0 Won’t Reach Operating Temp

    This is the one you’re talking about, right?
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Good to know. I bought it in November and have no idea when it was done last. I’m sure I didn’t help it along but it sounds like I was going to need to do it anyway at some point. Thank you very much for your help and I’ll post pictures of the impeller replacement as I go along. Dave
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Yeah, it’s a bravo 3 stern drive and the pump is indeed under the engine. Couldn’t be easy..
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Alrighty…assuming this is the right kit, I’ll let you know how it goes.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    I’d say 15-20 times for a few mins each.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Headed to West Marine to make another “donation” now. How long would you guess I have before I need to pull the trigger on the swap? Rough estimate is fine…
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Man, my face is a bit red on this one. I completely misunderstood the point of that circulation system, then. Thank you for the help!
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Should I look to replace the impeller at this point, then? Doesn’t look like too bad of a job. Super Helpful
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Understood. It was never an issue before so I’m curious why it popped up today. Not overheating anymore but now I’m hoping o haven’t been frying my impeller every time I ran it like that.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Update: ran it on muffs on the outdrive and having no temperature issues. Must be something wrong w my top down system. Crisis averted. An overheating boat is scary.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    I don’t run it w the RPMs at 1300. Just at idle before and never had any overheating issues. I also have a top down water system and run the hose through there.
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    Mercruiser 5.0 Won’t Reach Operating Temp

    What do you recommend at this point?
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    Mercruiser 5.0 Won’t Reach Operating Temp

    I did verify. Why would it overheat on land but not in the water? All I did was change out the thermostat and move a gasket but now the impeller is bad? How would that not have been picked up before when I had a different thermostat that was stuck open?
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    Mercruiser 5.0 Won’t Reach Operating Temp

    Update: replaced the new thermostat and I did have the top gasket in the wrong spot. Got up to temperature under load and stayed there. However, it started to overheat when I got it home and used a hose - never done that before. Is that normal?
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    Mercruiser 5.0 Won’t Reach Operating Temp

    That’s also the exact video I pulled when I started this project, too. Great minds…
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    Mercruiser 5.0 Won’t Reach Operating Temp

    I did put a layer of permatex on the bottom between the manifold and the first gasket - I wonder if that is affecting the communication. I’ll take it apart tomorrow and investigate.
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