Suddenly lost water pressure and got overheat alarm...
07-17-2022 | 06:43 PM
#11
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From: Clarkston, Michigan
make sure you buy Merc or Q silver impellers not the knockoffs
https://www.ebay.com/itm/33271501529...cAAOSwCR9cnVV6
https://www.ebay.com/itm/33271501529...cAAOSwCR9cnVV6
Yes, Quicksilver kit, not the $15 knock-off. Got it on Amazon though. It came today. Pump is together with new wear plates, Ran boat on the hose and it held 5 psi at idle which is about all the water my well and long hose can supply. Gonna try to splash it in the morning with fingers crossed. It's cheaper on eBay!
If I'm following the progression of events correctly, you were on plane when you lost water press. Shutdown and got towed in. After it cooled, you restarted and got 5 psi at idle for a little bit then lost water press again. If that is correct, then maybe you ran over a plastic bag and it wrapped itself around the drive shutting off the water. Bag falls off while being towed in. When bag blocked water flow, it created a very high vacuum within the pump inlet hoses and caused the inner and outer plys to separate from each other within a short section of hose. Now when you restart at idle. The normal vacuum inside the hoses causes the delaminated inner hose ply to collapse and shut off water flow. Outside of hose looks fine. Just a WAG.. Not even sure if the hoses are 2 ply.
I've seen this happen with a vacuum hose once. Drove me nuts for hours.
I've seen this happen with a vacuum hose once. Drove me nuts for hours.
07-17-2022 | 06:57 PM
#12
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From: jenison mi
for whats its worth, i have the same hardin pumps as you and i have found they do not like even slight damage or even old/ stiff vanes. yours may have looked ok but i couldnt get a two year old one to suck water off the hose
the bag theory sounds quite plausible to me
the bag theory sounds quite plausible to me
07-18-2022 | 09:13 AM
#13
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From: Clarkston, Michigan
No good. I had high hopes when it held 5-6 psi at the dock but when I planed out it never went over 5 psi. It's not a gauge problem. The headers were getting hot. The collapsing intake hose sounds like the next thing to look at. I assume the hose on the outside of the boat would be the more likely culprit? Either one looks like they will be a b*tch to replace.
07-18-2022 | 09:59 AM
#14
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From: KY
If you have the hard wall intake hose its not going to collapse. On plane water is being pushed into the holes on the drive. Not getting much flow I would suspect Bravoits or the intake transom hose is kinked
07-18-2022 | 10:10 AM
#15
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From: Clarkston, Michigan
07-18-2022 | 12:02 PM
#17
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From: Clarkston, Michigan
Fortunately this is a fresh water only boat that I bought new in 2005. Replacing either hose looks very difficult and it's guesswork. So the potential problem is the inner wall of the hose broken down and closing it off when water is flowing. Could I eliminate this potential problem by pulling the drive and putting a water hose on the intake end and opening the sea strainer and see if the flow stops or slows down? Backflushing indicates no blockage. Also, if there is no blockage, wouldn't the boat moving at a decent speed through the water create more than enough volume and pressure and at this point the raw water pump would actually serve to lower the pressure?
Last edited by thirdchildhood; 07-18-2022 at 12:05 PM.
