How much water thru prop ?

[chris turner]

Mercruiser 5.7 Alpha 1 1989. Searay 230CC.
Just finished lower water pump change and started it with muffs. Running at about 1200 rpm engine temp seems steady at about 145 (on the dash gauge) and loads of water coming out from the ports in the transom plate but very little thru the prop. How much should come thru the prop in these conditions ?

 

[Bondo]

Re: How much water thru prop ?

How much should come thru the prop in these conditions ?

Ayuh,... Depending on the angle of the drive,... alittle or alot or none...

 

[chris turner]

Re: How much water thru prop ?

Thanks - boat level on trailer and drive right down.

 

[ziggy]

Re: How much water thru prop ?

this is what i consider to be normal for my rig...

this was after a new impeller...

 

[chris turner]

Re: How much water thru prop ?

Don't think I'm getting near that amount - though perhaps difficult to say from a photo. What 'decides' the division of the water output - ie how much comes from the transom plate vents versus the prop ?

 

[bigskiohio]

Re: How much water thru prop ?

mine shoots out quite a bit from prop , maybe hose pressure.

 

[Bondo]

Re: How much water thru prop ?

What 'decides' the division of the water output - ie how much comes from the transom plate vents versus the prop ?

Ayuh,... The Level/ Angle of the boat,...
The condition of the Shutters....
The condition of the Manifolds/ risers...
The condition of the Rest of the system follows it up....

 

[chris turner]

Re: How much water thru prop ?

Hi - been out in boat today - no more overheating after new pump - need to check drive oil etc. but things much better. But have heard about this mythical 'shutter' beasts (where are they ?) and how bad risers can wipe out your bank account but how do I check them ?
There seems to be two ways water gets into the exhaust - one into the bottom of the manifold and the other into the side (front face) of the riser - is that correct ?
The pipes into the bottom get hot, but the ones into the risers stay cold - good or bad ? Do you know of a good schematic for the cooling system so I might understand it ? Thanks again for the help, Chris.