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My engine is closed cooled.
the raw water side has the pressure gauge between the seapump and the first cooler. I dont see why water pressure couldnt be taken using the drain plug on a cooler, second pic. Heres an adjustable option for a water pick up. https://www.cpperformance.com/p-1254...ck-up-kit.aspx https://cimg4.ibsrv.net/gimg/www.off...069389823b.jpg https://cimg5.ibsrv.net/gimg/www.off...968938e9fc.jpg |
outonsafari
thanks for the picture yes that would be good move to install pressure gauge on incoming hose into engine cooler seems have to cut another hole in hull or move to transom pickup (any more holes and I'll be going for the submarine look) looks like I can position the water pickup approx. 100mm (or closer) inside transom between transom and Z-drive cross member brace The transom is 70mm thick Not sure how can improve the sea strainer as it has 1.25" bottom in coming connection and then filters through vertical gauze to the outside of strainer then 1" hose connection to raw sea water pump Have yet to make a decision on what to use 1. Have a mercruiser pump here 2. Have Jabsco crank mounted pump here 3. or alternative Have mounted engine cooler 3"x18" on Port side of stringer rail, although picture shows it on starboard side https://cimg9.ibsrv.net/gimg/www.off...673e1ae44b.jpg https://cimg0.ibsrv.net/gimg/www.off...e50648ff59.jpg https://cimg6.ibsrv.net/gimg/www.off...7e106f829a.jpg the sea strainer coming into picture on RH side |
I dont think you have to move the pickup.
Team archer is right about plumbing it into the side and using the bottom to supply the engine. Just doing that solves the issue of moving either the strainer or pickup. 90 degree npt/ hose barb on the bottom of the strainer pointed right at the seapump. The ball valve on the intake should stay in place, close the valve and use the garden hose fitting on top of the strainer to run the engine when the boat is on the trailer. Dont worry about changing or modifying the intake unless or until it doesnt provide consistent water. Which seapump to use will depend on what belts and accessories are going on the engine, as always pictures help getting things sorted out. |
Outonsafari
At present there is 1" barbed hose fitting coming inside side of strainer I'm assuming would be good idea to upgrade this connection to 1.25" all the way through to the sea pump? In which case the 1" fitting comes off and will weld on 1.25" fitting? |
What is the correct height the strainer should be located from the hull and water line
I'm assuming in most cases the sea pump will be lower than the sea strainer, and therefore will have sea water in hose between seapump and strainer, so pump wont run dry when engine starts, or is it best practice to place a non-return valve inline to keep the bump primed? |
Brett you have to feed the strainer water in thru the fitting in the side and out to the engine thru the bottom fitting that gives you the most area on the screen in the strainer . And yes you should up size the hose to 1.25 inches.and don't not put a one way valve in the feed hose that's just asking for trouble. Regards Dan
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Dan
okay got it, I'll upgrade to the 1.25" side entry how low can strainer sit? If I move the hoses around I could probably lower the height another 3" this picture maybe clearer https://cimg1.ibsrv.net/gimg/www.off...419ffc0e64.jpg |
The lower the better that way the water pump doesn't have too work so hard pulling the water up and thru the strainer. Regards Dan
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Water pressure between strainer and pump
so getting hose fittings and joiners together for strainer -pump-HX can someone advise what water pressure is ideal between the sea strainer and sea pump if you’re all running water pressure gauges what water pressure reading do you see at maximum speed ? also is it wise to T in a pressure valve between strainer and punp this way if pressure jumps we can dump the excess water and released pressure over the side through a pop off valve I see Hardin sale a couple different pressure relief valves which can be regulated not sure how this his done |
I always run the pressure gauge after the water pump and the max I like to see is about 20 to 25 LBS I have pressure relief valves mounted to the sea strainer up high near the top. Regards Dan
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Dan so at sea strainer the pressure will be greater depending on speed and if there is blockage ? do you know what pressure the relief valve is set to bleeding off at strainer ? I was thinking of putting pressure relief valve either 1. T in-line from strainer to pump 2. In line between pump and first heat exchanger (engine oil) anyone has opinion?? |
Originally Posted by brett fiddes
(Post 4662724)
Dan so at sea strainer the pressure will be greater depending on speed and if there is blockage ? Yes on speed, usually lower past strainer if blockage is in strainer do you know what pressure the relief valve is set to bleeding off at strainer ? 30 to 35lbs I was thinking of putting pressure relief valve either 1. T in-line from strainer to pump YES, as Dan stated above 2. In line between pump and first heat exchanger (engine oil) anyone has opinion?? |
Water pick up update:
have relocated the water pickup hose coming into side of sea strainer now upgraded to 1.25" hose managed to move sea strainer down 3" and back 2" plumbed 1.25" fittings to route water out of bottom of sea strainer, and T off one of the fitting by welded 1/2" NPT fitting into line, will put the 1/2" adjustable relief valve in here and route to outside of boat above water line Plumbed up P/S and Engine HX Just need to mount the Jabsco crank and route the 1" hoses either side of the sea pump to sea strainer and into bottom HX Then need to think about where to mount the mercruiser closed water HX and connect up the hose from top HX https://cimg9.ibsrv.net/gimg/www.off...811be53596.jpg P/S and Engine HX https://cimg0.ibsrv.net/gimg/www.off...208b3cad89.jpg Sea strainer plumbed in https://cimg1.ibsrv.net/gimg/www.off...f5669b6321.jpg |
That Jabsco pump should have 1.25 hose barbs on it you should feed the engine with the 1.25 hose also. Regards Dan
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Dan
yes sorry hose coming from strainer is 1.5" and then steps down to 1.25" in/out of pump |
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