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Recent content by poloperson57

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    Mercruiser 350 Mag MPI broken plastic drain plug. Next steps.....

    Great advice everyone. It's mighty cold, dark and miserable here at the moment so I'll tackle this when it's warmed up a bit.
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    Mercruiser 350 Mag MPI broken plastic drain plug. Next steps.....

    So I was draining my Mag 350 MPI (year 200 model), and as I was re-tightening the one right at the bottom of the engine on the starboard side, it snapped off! Jeez - I was doing it by feel as I didnt have my light with me, and immediately thought I was in *big* trouble, given the poor access...
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    Ongoing problem with serpentine belt.

    Thanks Jack, I’ll definitely check all that out very carefully next time I’m at the boat. One thing that’s puzzling me though is why the belt appears to be stretching so much. It’s gone from being difficult to actually get on with the tensioner as loose as it goes, (it was a brand new belt)...
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    Ongoing problem with serpentine belt.

    I need to find someone with this engine, and who goes fishing. Then I can ask them to take out their fishing scales, hook it up to the belt, and pull it up by 1/2" and tell me what weight they are reading. That should give me a fairly accurate tension reading, as long as the 1/2" travel is...
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    Ongoing problem with serpentine belt.

    This bondo, apart from the crank pulley, should all the others go round with just hand pressure?
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    Ongoing problem with serpentine belt.

    Yeah, this is something I’m really struggling with. The manual says something like “1/4 inch or 6mm deflection in the middle of the longest part of the belt between 2 pulleys, with moderate thumb pressure”. What is moderate thumb pressure? I did try this method and it pretty much correlated...
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    Ongoing problem with serpentine belt.

    I have a 2020 Mercruiser mag 350 mpi in my 1999 Rinker fiesta Vee 242. I hadn’t had the boat long when I noticed a rattle coming from the engine, and when chugging slowly up the river, it suddenly cut out. Long story short - water circulating pump bearing failed, so I replaced the pump. Then...
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    Water recycling pump replacement

    Thanks Jack. Really helpful. And it’s amateur, not amature.
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    Water recycling pump replacement

    Thanks for this. No, I’ve not done an oil change, I’ve only had the boat for a few weeks, and am still discovering what’s wrong with it. And I can’t give any specifics about the engine, as I don’t know them really. Not that that should matter tbh. It is what it is - a mercruiser mag 350 mpi...
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    Water recycling pump replacement

    Hi Jimn, I’ve already replaced the water circulating pump and that all seems to be working ok on that front. It’s a raw water engine, so water is taken in and pumped up to the water recirculating pump via the raw water pump (impeller etc). I don’t know if the last pump was the original. It’s...
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    Water recycling pump replacement

    Well, back from another working day on the boat, and thanks to Jack's graph I can now say the gauge is functioning correctly. (I put a 90 ohm resistor across the signal terminal and ground and the gauge was reading round about 170F, so I conclude that the sender is officially duff, and will be...
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    Water recycling pump replacement

    Perfect! Thank you. One question, are the red and blue lines the tolerances?
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    Water recycling pump replacement

    So, back after another repair stint to my boat. Started off changing the Thermostat, mainly because it was the easiest part to get to, and I was feeling lucky. Sadly this made no difference, but something had been bugging me. My temp gauge is actually reading as per the photo. But I was...
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    Water recycling pump replacement

    By the way, this (thread question) piqued my interest so I started researching different threads etc. Found out all about NPT for tapered threads on pipes etc, but also UNC, UNF, BSF, BSP, BSW, BA and AF! Threads have a fascinating history, with many evolving from USS (United States Standard...
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    Water recycling pump replacement

    Thanks for this. That makes perfect sense. The more I read, the more I understand the temperature needs fixing before anything else. Hopefully, as you say, if I can sort that then everything else should fall into place. The belt is pretty new, and there is already a spare on board, so once the...
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