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#1
posted to rec.boats.cruising,uk.rec.sailing
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Volvo MD7A overheating
This installation diagram from Vetus on their water strainer
specifically shows that the strainer be at least 15cm / 6" ABOVE the waterline. http://www.vetusweb.com/manuals/file...01%2007-07.pdf MW |
#3
posted to rec.boats.cruising,uk.rec.sailing
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Volvo MD7A overheating
Bruce In Bangkok wrote:
On Sun, 21 Dec 2008 22:45:50 -0800 (PST), wrote: This installation diagram from Vetus on their water strainer specifically shows that the strainer be at least 15cm / 6" ABOVE the waterline. http://www.vetusweb.com/manuals/file...01%2007-07.pdf Yes it does but I can see no reason for it. To clean the filter you turn the sea cock off so that can't be the reason Yes it can be, but it probably isn't the only reason. Doing it this way means you don't *have to* close the seacock when cleaning the filter, although it is of course good practice to do so anyway. If the strainer is mounted above the waterline, then it's easier to see whether it even needs cleaning, without having to bend down and put your head and an inspection lamp into a difficult to get at space. A few more reasons: (1) If the strainer lid leaks slightly (this should never happen, but it could), then if it's below the waterline you will get water coming into the boat unless you close the seacock every time you stop the engine (and if you do that, you have to remember to open it every time you start the engine). Most people don't do that, they only close seacocks when leaving the boat unattended for a prolonged period (more than a few hours). (2) If the strainer is mounted above the waterline, it's likely to be in a more visible position, and will have some air in the top. This makes it easy to tell visually how well the pump is sucking, from the gush of water coming up the feed pipe and splashing against the underside of the strainer lid. This is sometimes easier than looking for water coming out of the exhaust. (3) If it's ever necessary to prime the pump manually, this is more easily done if it's above the pump: just open the strainer lid and pour water in. and the way it is specified every engine start is with a dry impeller in the pump. This is not actually true. Typically the hose from strainer to pump is always full of water, and so is part (maybe half) of the strainer body. |
#4
posted to rec.boats.cruising,uk.rec.sailing
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Volvo MD7A overheating
"Bruce In Bangkok" wrote in message
... On Sun, 21 Dec 2008 22:45:50 -0800 (PST), wrote: This installation diagram from Vetus on their water strainer specifically shows that the strainer be at least 15cm / 6" ABOVE the waterline. http://www.vetusweb.com/manuals/file...01%2007-07.pdf MW Yes it does but I can see no reason for it. To clean the filter you turn the sea cock off so that can't be the reason and the way it is specified every engine start is with a dry impeller in the pump. Doesn't make sense to me... unless you like to change pump impellers. Cheers, Bruce (bruceinbangkokatgmaildotcom) My strainer is well above the water line, and I don't have to turn off the seacock to clean the strainer. The out from the strainer holds water against the impeller, so it's never without a water start... -- "j" ganz @@ www.sailnow.com |
#5
posted to rec.boats.cruising,uk.rec.sailing
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Volvo MD7A overheating
On Sun, 21 Dec 2008 22:45:50 -0800 (PST),
wrote: This installation diagram from Vetus on their water strainer specifically shows that the strainer be at least 15cm / 6" ABOVE the waterline. http://www.vetusweb.com/manuals/file...01%2007-07.pdf Probably because their strainer has a plastic top (polycarbonate) which I regard as unseaworthy. Proper marine strainers look like this: http://marineengineparts.com/shopsit...l/page515.html |
#6
posted to rec.boats.cruising,uk.rec.sailing
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Volvo MD7A overheating
Wayne.B wrote:
On Sun, 21 Dec 2008 22:45:50 -0800 (PST), wrote: This installation diagram from Vetus on their water strainer specifically shows that the strainer be at least 15cm / 6" ABOVE the waterline. http://www.vetusweb.com/manuals/file...01%2007-07.pdf Probably because their strainer has a plastic top (polycarbonate) which I regard as unseaworthy. Proper marine strainers look like this: http://marineengineparts.com/shopsit...l/page515.html The removable glass cyclinders don't look much less seaworthy. If you want a really proper one, get one which is all bronze, like this: http://www.gaelforcemarine.co.uk/Pum...isherman-Model |
#7
posted to rec.boats.cruising,uk.rec.sailing
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Volvo MD7A overheating
"Ronald Raygun" wrote in message
... Wayne.B wrote: On Sun, 21 Dec 2008 22:45:50 -0800 (PST), wrote: This installation diagram from Vetus on their water strainer specifically shows that the strainer be at least 15cm / 6" ABOVE the waterline. http://www.vetusweb.com/manuals/file...01%2007-07.pdf Probably because their strainer has a plastic top (polycarbonate) which I regard as unseaworthy. Proper marine strainers look like this: http://marineengineparts.com/shopsit...l/page515.html The removable glass cyclinders don't look much less seaworthy. If you want a really proper one, get one which is all bronze, like this: http://www.gaelforcemarine.co.uk/Pum...isherman-Model Maybe, but then you can't see what's going on without opening it up. With the clear one, you can see if there's debris with the engine running. Can't imagine what would break the glass in anything other than extraordinary circumstances. Then, you probably have bigger problems anyway. -- "j" ganz @@ www.sailnow.com |
#8
posted to rec.boats.cruising,uk.rec.sailing
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Volvo MD7A overheating
Capt. JG wrote:
"Ronald Raygun" wrote in message ... Wayne.B wrote: Probably because their strainer has a plastic top (polycarbonate) which I regard as unseaworthy. Proper marine strainers look like this: http://marineengineparts.com/shopsit...l/page515.html The removable glass cyclinders don't look much less [un]seaworthy. If you want a really proper one, get one which is all bronze, like this: http://www.gaelforcemarine.co.uk/Pum...isherman-Model Maybe, but then you can't see what's going on without opening it up. With the clear one, you can see if there's debris with the engine running. True. Can't imagine what would break the glass in anything other than extraordinary circumstances. Then, you probably have bigger problems anyway. Well, I would imagine that anything which would break the polycarbonate would also break the glass. |
#9
posted to rec.boats.cruising,uk.rec.sailing
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Volvo MD7A overheating
"Ronald Raygun" wrote in message
m... Capt. JG wrote: "Ronald Raygun" wrote in message ... Wayne.B wrote: Probably because their strainer has a plastic top (polycarbonate) which I regard as unseaworthy. Proper marine strainers look like this: http://marineengineparts.com/shopsit...l/page515.html The removable glass cyclinders don't look much less [un]seaworthy. If you want a really proper one, get one which is all bronze, like this: http://www.gaelforcemarine.co.uk/Pum...isherman-Model Maybe, but then you can't see what's going on without opening it up. With the clear one, you can see if there's debris with the engine running. True. Can't imagine what would break the glass in anything other than extraordinary circumstances. Then, you probably have bigger problems anyway. Well, I would imagine that anything which would break the polycarbonate would also break the glass. In my case, the strainer is about chest high when I'm standing in the cabin. It's just behind the forward firewall above the top of the steps just to port of the sink. It would take a lot to break it from the firewall side. On the engine side of the strainer, there's open space above the engine. Probably my biggest concern is bumping it when I completely remove a small drawer above the top step, but it's a minor concern. -- "j" ganz @@ www.sailnow.com |
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