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


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  #1  
Old 08-09-2013
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Raw water strainer

My Yanmar 3GM30F has never had a raw water strainer. I would like to install one. The only kind I'm familiar with are the standard Groco units which I've had on other boats. There are now reinforced plastic units which look pretty good. I am wondering if anyone has tried one of these on his/her Yanmar and how it worked out. As much as I like bronze, it does eventually get corroded whereas materials like Marelon do not. Price is comparable. The plastic units look really easy to clean out.
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Old 08-09-2013
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Re: Raw water strainer

Wanting to install something like this?

For Sale: Groco Raw Water Strainer - Cruisers & Sailing Forums

the one I installed on my boat seems to be working well so far.
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Old 08-09-2013
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Re: Raw water strainer

In line strainers are recommended also. I don't have one yet. Just the old school bronze dome fitting on the hull.
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Re: Raw water strainer

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Originally Posted by Rhapsody-NS27 View Post
Wanting to install something like this?

For Sale: Groco Raw Water Strainer - Cruisers & Sailing Forums

the one I installed on my boat seems to be working well so far.
Thanks for that link Daniel, will keep it bookmarked. Will have to first get the m/m of my raw water pump and seacock so I don't make the same mistake as the poster.
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Re: Raw water strainer

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Originally Posted by smurphny View Post
Thanks for that link Daniel, will keep it bookmarked. Will have to first get the m/m of my raw water pump and seacock so I don't make the same mistake as the poster.
That would be me

understandable to make sure you get the right one. I'm out of town for the rest of the month for work.
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Re: Raw water strainer

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In line strainers are recommended also. I don't have one yet. Just the old school bronze dome fitting on the hull.
That's the same thing I have now and have never had any problem with a clogged intake . The wisdom of adding failure points downstream of a seacock by installing a strainer is questionable. It might well keep some material out of the heat exchanger in the long run but it also adds a plastic lens, and two more clamp points to have to worry about. Still undecided as to the real necessity. Even if some debris were to accumulate in the heat exchanger, it would be pretty simple to pop the end cap and clean it out.
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Re: Raw water strainer

My strainers (previous and current boat) have caught a lot of stuff (mostly seaweed) that would have choked the water pump, and quite possibly damaged it. In one case, even the hose between the through-hull and the strainer plugged up (that boat did not have a grille over the intake).

Better IMO to have a strainer which can be checked visually than wondering why there's no more water coming out the exhaust.
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Old 08-10-2013
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Re: Raw water strainer

The problem with not having a strainer is that it will work perfectly until you need the engine in a critical situation. One glob of sea grass blocking your heat exchanger and the engine overheating at just the wrong time will convince you that maybe there is a good reason that all commercial boats have strainers.
I like the Groco bronze, but anything is better than nothing. Regarding the extra connections and clamps, they should be part of your routine annual (or more often) inspection of all critical hoses and clamps and the clamps should be all 316 SS.
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Re: Raw water strainer

I can remember getting eel grass into the slotted type intake strainer but the boat I have now has one of those simple bronze cup type strainers with a whole lot of holes in it, probably 1/8." The holes are essentially the same size as those inside the interior type strainers. Grass can't get through the one on there now. I'm not convinced that an interior strainer would really be any more effective and it's not as if I'm going through a lot of impellers or anything. Think I've talked myself out of this idea. Thanks all for the input.
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Re: Raw water strainer

Pretty much required here due to kelp and eel grass, the 3gm30f in my Catalina has a pint sized plastic strainer pretty much standard across their line of boats mounted below waterline. They can still get enough seaweed to clog.
Catalina Direct: Sea Water Strainer
Some new French boats I crew on use a what looks like a pool strainer mounted above waterline, seems like it would be pretty difficult to clog.
Boat Marine Plumbing Water Strainer Thru Hull
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