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  Topic Review (Newest First)
2 Weeks Ago 03:50 PM
Re: Sea Water Strainer

I'd be inclined to locate my sea strainer below the waterline, as anytime the pump goes dry (water running back into an air pocket in the sea strainer) it is damaging the impeller each revolution.
2 Weeks Ago 03:43 PM
Re: Sea Water Strainer

Originally Posted by Woodvet View Post
Including almost chewing through the seacock line to the strainer.
Having the sea strainer above the waterline isn't going to make any difference in this case.
2 Weeks Ago 02:15 PM
Re: Sea Water Strainer

I had a dirty rat aboard my boat once...
Came up my dock line and then down the anchor chain.
It did thousands in damage in very little time.
Including almost chewing through the seacock line to the strainer.
If you ever forget to shut off the seacock as some do from time to time. You might find a strainer above waterline an advantage.
Not sure what this extenuating circumstance with the priming is if legit....
Thanks for that info. I will seek that out.
Salt water is not allowed to get on my engine so the thought if the O-ring or the plastic/glass view was to fail, THAT scares the crap otta me! (If strainer is installed below the water line)..
Through hull for strainer is near keel to keep it charging even on a heel and that has it tortured by egress and ingress about the engine. Stay up on the wear on that too...
The bilge pump should take care of any leaks but with some GRP owners the vigil is more lax and may get neglected.
01-19-2003 07:05 AM
Sea Water Strainer

Jim, this is the first time I have ever heard of the raw water losing prime. I used to have my strainer about even with the water line then the hose went about another three feet up to the pump which was about 18 inches above the water.I never had a problem. I am refitting right now and have moved my sea-**** to a different place and now my strainer is about the same height as the pump and when I run the motor on the hard with the hose in the bucket in the cabin even lower the pump starts sucking right away. I would check for air leaks or like peter pan said check your impellar.-thomas
01-18-2003 06:54 PM
Sea Water Strainer

If you have a seacock that is easy to access then there is a good reason to lower the filter to remidy the effect of air lock. However if you don''t! It could get a bit hairy when the water starts to flood in and you can''t stop it.
On second thought! Your raw water pump impeller might be throughly worn out. I have Jabsco pumps that are at least a foot above the water line and never have a problem unless the impellers are shot. They''re not hard to repair.
01-18-2003 09:54 AM
Sea Water Strainer

My engine sea water strainer is located about 8" above the waterline. After cleaning the strainer, I often lose the pump prime and have trouble getting the system back in operation.

I''ve made inquires as to the height of the strainer in other boats and have learned that some strainers are mounted above the waterline and some are below.

Below the waterline seems good in that you wouldn''t lose your prime when cleaning, but there must be reasons for locating it above the waterline as some are installed that way.

Anyone care to shed some light on the pro''s and con''s of the sea water strainer''s height?



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