Backwards sea pump
01-26-2015 | 06:17 PM
#12
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From: Hingham,Ma
I had to change my wording up so it reads a little different from my 1st post. I know what you are talking after I had to think especially now I see about the oil pan post as if you are installing an oil pan with kick outs.
If you have enough front clearance not to put fold over bends in your water hoses input and output hoses from the impeller housing body and if you can line up the pulley and belt perfectly straight, it can be done, but there is a but.
These stock Mercruiser pumps are one way inlet and one way outlet specific. The complete pump turned backwards now runs in the opposite direction so the outlet becomes the inlet and the inlet becomes outlet water directions, I know that's how it would work for the inlets & outlets but would test it 100 % beforehand and I am 99 % sure about it. its always that 1 % u have to worry about. Just saying
These stock merc waterpumps are inlet and outlet specific as I do know that for a fact. Important never change rotation direction of a used impeller and housings - you will have to start with completely brand new parts here.
IMO I would test it first before any lake runs on the water with the new positioned outlet hose in a bucket to see the volume of water flow or not.
If you have enough front clearance not to put fold over bends in your water hoses input and output hoses from the impeller housing body and if you can line up the pulley and belt perfectly straight, it can be done, but there is a but.
These stock Mercruiser pumps are one way inlet and one way outlet specific. The complete pump turned backwards now runs in the opposite direction so the outlet becomes the inlet and the inlet becomes outlet water directions, I know that's how it would work for the inlets & outlets but would test it 100 % beforehand and I am 99 % sure about it. its always that 1 % u have to worry about. Just saying
These stock merc waterpumps are inlet and outlet specific as I do know that for a fact. Important never change rotation direction of a used impeller and housings - you will have to start with completely brand new parts here.
IMO I would test it first before any lake runs on the water with the new positioned outlet hose in a bucket to see the volume of water flow or not.
01-26-2015 | 07:21 PM
#15
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so its going to be mounted 180 out from its original stance correct, if its mounted solid to your custom bracket, and the lines are plumbed correctly for the direction of water flow and the transfer mechanics line up/ belt pulleys etc.--your good to go. pump does not care it just pumps as fitted. what pan you using on the 632?
Last edited by I'CE; 01-26-2015 at 07:23 PM.
01-26-2015 | 07:37 PM
#16
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From: bel air, md
Going to run a Stef's pan. Told them not to worry about a notch for the sea pump so it can have a decent kickout. I just know from drag race stuff the more you kick the pan out the more power they will make. I was looking at Lightning Peformance groups website. Looks like they have a couple motors with twin (not dual stage) pumps and one is turned around backwards. I know it will work that not my concern. I think the belt will just clear the bracket setup I'm thinking about which would work great I can fab everything up in an hour or so.
01-26-2015 | 08:43 PM
#17
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From: Slidell, La.
I actually did this on my first sea pump changes on my 25ol. I pulled it off, installed a new housing kit and greased it up.
Started it up and less than a minute, no water! uh oh.. So I I was baffled, then I pulled the hose going into the t stat and cranked it up again and it was "sucking"!!!!
whew, ok so I swapped hoses and cranked her up again and voila she was blowing, turned off, turned on hose and there came the water!!! My issue was that I searched for a diagram online and the diagram confused me with top and bottom hoses instead looking at where the hoses were coming from. Also, inlet hose has the wire in it to prevent suction from collapsing it. duh!
Started it up and less than a minute, no water! uh oh.. So I I was baffled, then I pulled the hose going into the t stat and cranked it up again and it was "sucking"!!!!
whew, ok so I swapped hoses and cranked her up again and voila she was blowing, turned off, turned on hose and there came the water!!! My issue was that I searched for a diagram online and the diagram confused me with top and bottom hoses instead looking at where the hoses were coming from. Also, inlet hose has the wire in it to prevent suction from collapsing it. duh!
01-27-2015 | 12:22 AM
#19
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Joined: Jul 2011
Posts: 9,594
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From: Ft. Worth TX
"you talk to much" Thanks Pinball wizard, I am a thinker and do this for a living so its a habit especially when you have to explain details to your customers. try it sometime, it will get you moved up the ladder. Anyways sorry I take up to much space up here and your time as you can always skip over my novels. .
I would like to see pics of the your 24 Carrera if that you would make you feel better. Is it for sale ? Not messin around about this.
I would like to see pics of the your 24 Carrera if that you would make you feel better. Is it for sale ? Not messin around about this.
Last edited by BUP; 01-27-2015 at 12:34 AM.
01-27-2015 | 01:14 AM
#20
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Randy, that's a good idea: Jabsco, Sherwood and others. easy to service. ski boats run em. that might work for him. If he was doing a super charged engine, pulley depth could be an issue, but he's going N/A I believe.
Last edited by I'CE; 01-27-2015 at 01:21 AM.
