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Originally Posted by nsformula
(Post 4478694)
One thing a local tech said I may have a thermostat that is not seating and allowing the block to completely drain leaving the impeller dry after storage. I'll pull the housing and have a look. |
Originally Posted by nsformula
(Post 4478694)
I did end up taking the drive off, even though it is new, to double check the hose from the bell housing to the transom and it is in perfect condition and installed properly and not leaking.
I took the inlet hose from the transom to the pump off and checked the inside and it is in good condtion, you can see thru it and it is not coming apart on the inside. I replaced the w/p inlet hose with new hose and put at tee in it . I know this does not address whatever is causing my problem but it does allow me to flush the engine and prime the w/p if I need to. Many people have said I have a leak in the suction side of the water pump, which makes perfect sense, but, I have not been able to find that leak with 2 different drives. Also, as I said, if there was a leak there, why can I put a new impeller on it, and touch nothing else, and have the new impeller pull water right away. One thing a local tech said I may have a thermostat that is not seating and allowing the block to completely drain leaving the impeller dry after storage. I'll pull the housing and have a look. |
Originally Posted by nsformula
(Post 4478694)
One thing a local tech said I may have a thermostat that is not seating and allowing the block to completely drain leaving the impeller dry after storage.
. http://i661.photobucket.com/albums/u...9/ththweed.gif |
Ha ha, wasn't my idea, don't shoot the messenger.
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Do you have a water pressure Guage on the boat? is it possible that a high pumping resistance is what is destroying the impellers. Seems everything on the suction side is new . If not might be a good next step.
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Originally Posted by buck35
(Post 4478844)
Do you have a water pressure Guage on the boat? is it possible that a high pumping resistance is what is destroying the impellers. Seems everything on the suction side is new . If not might be a good next step.
No I don't, should be an easy install though. Where would I put the gauge, thermostat housing??? |
Block drain or preferably top of intake manifold.
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Listen everyone as a recap of the thread, he has said and we discovered that his drive also has low water pick ups, and these aren't being blocked off during being run on the trailer.
Each time the impeller has failed, it has previously been run on the trailer. We are waiting to see if this new knowledge of the situation keeps him from blowing impellers. If it keeps happening, we move on to other things...if it cures it, we are done. |
Originally Posted by SB
(Post 4478863)
Listen everyone as a recap of the thread, he has said and we discovered that his drive also has low water pick ups, and these aren't being blocked off during being run on the trailer.
Each time the impeller has failed, it has previously been run on the trailer. We are waiting to see if this new knowledge of the situation keeps him from blowing impellers. If it keeps happening, we move on to other things...if it cures it, we are done. |
What is the current status?
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I just skimmed the thread. But my question for you is do you have sea strainers? If you try and flush the boat with muffs the impeller needs to try and pull the water ALL THE WAY Up the drive with only air in the pipes. Not good. If you had sea strainers you at least get a pot of water to start with. In fact I just changed my friend pump this morning. He would normally flush the boat in barrels . Never a problem because the water was to the top of the drive. Somebody told him to just use the nose cone flush.... he tried it once lol. There was nothing left of the impeller.
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Originally Posted by nsformula
(Post 4474124)
That is another good suggestion, but by the time you know there is no water flow, the impeller is toast.
I could undo the hose and burp it before starting it though. That might help. as far as commenting on loosening the intake hose at the water pump that will not do it. the hose runs downhill from the transom so the air that is trapped in the hose needs to go up. if the hose was cut open at the highest point, and a pipe with a petcock was installed that would bleed off the air lock in the hose because the air will travel upwards and bleed out. I think this is a good solution for people that r loosing prime. It would be very easy to do at the launch before you fire up the engines. Open two petcocks until water comes out close them off and fire the motors up. |
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