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when it wont flow water, try bumping the starter, without starting it and see if water comes out, just to move the pump a bit
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Originally Posted by endeavor1
(Post 4474265)
My father fought a collapsing line on his crown line this year. The one in your transom assembly. Pumped water fine on hose and at idle but would close enough at 3000 and up to starve the pump and melt the impeller. We pulled our hair out trying to find the cause. If everything else checks out, replace it and see if it helps. His looked fun but apparently wasn't.
Would it do that consistently or just some time. Mine burns the impeller instantly at idle. The hose/drive is brand new. |
What do you lube the new impeller with and what direction do you put the vanes in when you install ?
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a dry impeller is toast in 20 seconds or less.i use white lithium grease or dish soap for initial start it sounds like you might have a pinhole or a crack in one of the hoses or a loose clamp somewhere in the system.it is a lot easier to suck air than water.when the drive was installed did you use a new o ring and did you use bellows adhesive to hold it in place?without the o ring it will suck air.
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Originally Posted by SB
(Post 4474277)
What do you lube the new impeller with and what direction do you put the vanes in when you install ?
I put the impeller in the housing and use a spare pump shaft to turn the impeller and flip the vanes in the correct direction before installing the impellor and housing on the shaft in the boat. The rotation arrows are on the housing. I have enough room that I don't need to pull the whole assembly to do the repair. |
[QUOTE=mike tkach;4474284]a dry impeller is toast in 20 seconds or less.i use white lithium grease or dish soap for initial start it sounds like you might have a pinhole or a crack in one of the hoses or a loose clamp somewhere in the system.it is a lot easier to suck air than water.when the drive was installed did you use a new o ring and did you use bellows adhesive to hold it in place?without the o ring it will suck air.[/QUOTE
The drive and transom were professionally installed at my dealer. I had the same impellor issue with the old drive. When I install a new impeller it always gets it's prime right away and works fine. It fails after sitting for a while or after being towed to a launch. This is why I am thinking it's an air lock issue, |
Originally Posted by nsformula
(Post 4473744)
There is no pattern for failure. Sometimes it failed running on the hose in my prelaunch start up/check over.
Sometimes it fails at initial start up in the water, after being just run ok on the hose. . I can't tell you how many people have issues with the Bravo set up on the trailer but totally fine when in the water. |
Originally Posted by SB
(Post 4474295)
Don't do this 'prelaunch start up' routine you have, and just start it when dunked. See if this changes the life of the impellar.
I can't tell you how many people have issues with the Bravo set up on the trailer but totally fine when in the water. I launch it, get under way, at low speed both times and a few minutes later, the temp alarm is beeping and steam coming out of the exhaust. I carry a kit with me, and fix it on the spot, takes about 45 minutes and is a pita next to a hot manifold. Again, works fine with a new impeller and I enjoy the rest of the day. |
https://www.gcsmarine.com/content/impellers/impellers
maybe this would at least help you to identify the location of the cause without having to stop and change out another impellor |
Originally Posted by nsformula
(Post 4474273)
Would it do that consistently or just some time.
Mine burns the impeller instantly at idle. The hose/drive is brand new. |
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