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Old 31-01-2021, 03:35   #1
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Seawater strainer failure

After experiencing a blocked heat exchanger at sea I decided it was past time to fit a seawater strainer.
I did the job while on the hard and tested by running 40 litres of water from containers. All good. Launched the boat and while motoring to my mooring had water pouring in. It turns out that when revs are added, the O ring that seals the lid, blows out. The lid clamps down with a wing nut.
Could it be that I purchased a water strainer thatís too small in flow capacity? Probably, because I didnít give any thought to it and just bought one that matched the existing hose diameter.
So I donít know. The motor is 20hp and the separator is rated for 150ltr per minute, but I canít find flow volume for the Volvo D1-20 in the manual.
Any ideas?
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Old 31-01-2021, 04:07   #2
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Re: Seawater strainer failure

This happens to me almost every spring when I launch. More then likely you havenít lined up the lid properly, and/ or clamped down on the lid enough. The lid must be perfectly lined up and tight, otherwise it leaks. Try the easy stuff first, If Iím wrong it wont cost you anything.
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Old 31-01-2021, 05:32   #3
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Re: Seawater strainer failure

See the Volvo D1-20 Technical Data sheethttp://www.darthaven.co.uk/userfiles...ta%20D1-20.pdf
Cooling water (raw & fresh) vary with RPM.
Sea water pump flow* & Fresh water circulation pump flow, specified near the bottom of page 2.

*42 to 89 foot≥/h, or 1.2 to 2.5 m≥/h = 5.2 US GPM to 11 US GPM

The Workshop manual covers the coolant system on pages 25 & 92-99, but isn’t very helpful, for your issue.
https://j109.org/docs/volvo_d1-30_workshop_manual.pdf
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Old 01-02-2021, 17:36   #4
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Re: Seawater strainer failure

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Originally Posted by Morgan Sailor View Post
This happens to me almost every spring when I launch. More then likely you havenít lined up the lid properly, and/ or clamped down on the lid enough. The lid must be perfectly lined up and tight, otherwise it leaks. Try the easy stuff first, If Iím wrong it wont cost you anything.


Thanks MS. The lid design, clamped by a single wing nut, doesnít seem to allow for misalignment. Perhaps not clamped down hard enough. The lid is plastic and not wanting to risk damage only tightened by hand...but pretty tight Iíd say.
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Old 01-02-2021, 17:48   #5
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Re: Seawater strainer failure

Thanks for the links GordMay.
It appears there is no issue with capacity at 11 GPM = 43LPM
Maybe I just need a spanner!
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Old 01-02-2021, 17:56   #6
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Re: Seawater strainer failure

Sounds like you have the strainer on the pressure side of the raw water pump. Typically it should be on the suction side. If this is the case, can you switch the hoses on the strainer?

150l/min is plenty.
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Old 01-02-2021, 18:17   #7
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Re: Seawater strainer failure

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Originally Posted by jimbunyard View Post
Sounds like you have the strainer on the pressure side of the raw water pump. Typically it should be on the suction side. If this is the case, can you switch the hoses on the strainer?

150l/min is plenty.
This ^^

Those centre bolt covers won't take very much positive pressure before leaking but any negative pressure (vacuum) should put the lid down on the seal.
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Old 01-02-2021, 19:09   #8
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Re: Seawater strainer failure

Thanks, yes that makes sense. I put it on the pressure side after reading others talk of failed impellers causing problems. Lesson: Nothing replaces regular maintenance.
I can easily change to suction side (as per Volvo Manual) which sounds as though will fix the issue.
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