Recent content by Henno

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    Overheating after impeller change

    PROBLEM SOLVED! First of all a big thanks to everyone who contributed to this thread. Today I finally found the problem after a day of drama and it turned out to be those missing impeller pieces. Went for a spin on the boat and again ran fine when cruising along or at high speed. When I...
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    Overheating after impeller change

    UPDATE Thanks again for all the replies. So this morning I checked the water flow AFTER the pump. At idle I am getting around one gallon of water in 15 seconds. Is this normal or below average I wonder? I am planning on replacing the impeller again this week with a new one, just in case there is...
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    Overheating after impeller change

    UPDATE Thanks again for all the replies. So this morning I checked the water flow AFTER the pump. At idle I am getting around one gallon of water in 15 seconds. Is this normal or below average I wonder? I am planning on replacing the impeller again this week with a new one, just in case there is...
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    Overheating after impeller change

    Thanks for this dypcdiver. Do you know if this is something I can check while the boat is in the water, or would it need to be lifted out?
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    Overheating after impeller change

    UPDATE So today I checked the manifolds and risers and the looked in very good condition with no rust build-up. Must have been changed at some stage by a previous owner and has been in fresh water since I got her. I flushed out pretty much every area I could reach and then started her up. Again...
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    Overheating after impeller change

    Thanks Kenny. Will take a look today
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    Overheating after impeller change

    Will try this today Scott, many thanks
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    Overheating after impeller change

    Many thanks for this Bruce. I will give this a try today hopefully.
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    Overheating after impeller change

    Hi Dingbat. As far as I am aware there is no impeller in my Volvo penta duo prop outdrive, but I stand to be corrected
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    Overheating after impeller change

    Looks like a good suggestion Kenny. I wouldn't be surprised if they were never changed. Still can't figure out why the sudden change in operating temperature just after fitting a new impeller, especially when the old impeller was missing a few teeth
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    Overheating after impeller change

    Just to add also. I noticed today also a marked difference in the temperature of the two risers. The port side remained only warm to touch but the starboard side was much hotter. You would not keep you hand on it for more than a second or two.
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    Overheating after impeller change

    UPDATE So today I checked the impeller and it looks perfect. I ran the boat in the water at idle for a good 20 minutes and it eventually reached a temperature of around 190F. When I revved the engine the the temperature dropped to 160F approx it looked like I was getting a good flow of water. I...
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    Overheating after impeller change

    Hi Scott. Yes the type of pump on my boat has two different size hoses on the inlet and outlet so you can't get it wrong. Thanks anyway
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    Overheating after impeller change

    Thanks Malibu Mike. Not sure this model boat has a water flush port but I will check
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    Overheating after impeller change

    Hi Kenny Yes it does stay in the water so maybe that is a possibility. I did get water flowing through by sucking on the pipe. I wonder if there was an air lock and I have now damaged the new impeller by running it dry?
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