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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 10-23-2013
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External and internal raw water strainer?

I'm about to have a major refit done this winter on a decades old boat bottom. Seacock replacement will be considered. If I go that route, is there any good reason I should remain with my current external AND internal raw water strainer setup?
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Old 10-23-2013
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External and internal raw water strainer?

Yes. It's the same reason for multiple fuel filters - to keep bad stuff from getting into the engine. I have the same setup and find sea grass in my second strainer. Not often, but enough. If you aren't racing there isn't a good reason not to have two strainers.
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Old 10-23-2013
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Re: External and internal raw water strainer?

Quote:
Originally Posted by Sabreman View Post
Yes. It's the same reason for multiple fuel filters - to keep bad stuff from getting into the engine. I have the same setup and find sea grass in my second strainer. Not often, but enough. If you aren't racing there isn't a good reason not to have two strainers.
Same here . Good advice. Sea grass has made it past by primary strainer to the second one. Same with nettles.

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Re: External and internal raw water strainer?

Plastic bags and jelly fish are easier to remove from the screen than pulling hoses inside.I even put in a hose bib so I can blow or cool with domestic water. Only used it twice in 30 years.
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Re: External and internal raw water strainer?

Personally I can't stand external strainers. With internal strainers they are completely redundant, and frankly cause more problems than they are worth. They commonly geting fouled, are commonly installed the wrong way, and frankly provide minimal protection. Added to the the fact that they can't be cleaned without getting in the water makes them a poor choice.

You also generally need a much larger hole in the boat to ensure proper water flow with an external strainer than you need without one because of the flow restriction from the screen. Most applications come with a specced size of hole in order to allow enough water flow, external screens provide a significant amount of resistance because of the minimal surface area of the screen. Compare that to the surface area of an internal strainer and you can see the issue.
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Old 10-24-2013
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Re: External and internal raw water strainer?

Quote:
Originally Posted by Sabreman View Post
If you aren't racing there isn't a good reason not to have two strainers.
And therein lies the issue. I do race, and am considering going with all new flush through-hulls.
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