impeller problem

Polspear · 28 July 2013, 10:20

Hi,
My impeller needs replacing, it turned out that it is not thypical- hard to get. so i thought- why o why shouldn't this part be made of brass, it shouldn't be too dificult to make one and if properly made it would last for ever (well longer anyway) what do yous think?
brgds

Nos4r2 · 28 July 2013, 11:36

What motor is it? Unless it's a Seagull, it needs to be a flexible impeller. They seal to the edges of the housing.

IE, you can't make it out of metal.

Got a picture of the old impeller?

Polspear · 28 July 2013, 15:59

the one i have is not original- some mechanic stuffed inside whatever he could find just to sell it. It is a volvo penta 6 hp. i know they seal to the edge but if you make part of brass that's rotating very closely tho the edge of housing (i'm talking about 0,0... mm) it should give a good suction as well, don't you agree? Preatty much the same as centrifugal pumps work?

Nos4r2 · 28 July 2013, 17:43

Quote:

Originally Posted by Polspear

the one i have is not original- some mechanic stuffed inside whatever he could find just to sell it. It is a volvo penta 6 hp. i know they seal to the edge but if you make part of brass that's rotating very closely tho the edge of housing (i'm talking about 0,0... mm) it should give a good suction as well, don't you agree? Preatty much the same as centrifugal pumps work?

No. The impeller usully doesn't sit central in the housing.-the blades squish just after the pipe to the powerhead.

m chappelow · 28 July 2013, 18:05

You may get away with making one for a seagull engine as some blades are metal or hard plastic but they work in a slightly different way as the pump housings not offset as a normal outboard centrifugal pump .
With a seagull engine the water pump only gives more or less a water flow with a limited amount of water pressure usually just enough to reach the engine ( you can put your thumb over the outlet & stop the flow )
where as with a normal outboard the impeller blades get squashed in one half of the pump housing giving more pressure so the blades have to be flexible .
I've had a few Volvo outboards in the past some have 2 water pumps & impellers fitted one above the other one can be used as a bilge pump you could be looking at the aux impeller .