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Old 01-23-2022, 05:13 PM   #1
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Sea strainer bowl cracked .Marina fault?

i have a 34T Mainship 2006, i chose to leave it in water this season and had marina winterize while in water. NEVER AGAIN !

He winterized the water line system way before the freeze here in Long Island.

But i believe he delayed the engine winterize. he did it after a day after significant freeze of our first 15 degree day. Even though i had heaters running in the engine room it was 60 degrees inside. I noticed that all the thru hull valves (AC & generator were closed) except the engine thru hull , possibly mixing saltwater with propelyne glycol creating a diluted mix in the strainer bowl, thus creating the crack-freeze? Is this possible? should i hold him responsible?
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Old 01-23-2022, 05:30 PM   #2
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Considering there's visibly antifreeze in there and it still froze and cracked, I'd say it wasn't adequately winterized and it's their fault. I'd bring it up to them ASAP.
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Old 01-23-2022, 06:10 PM   #3
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While the day might have been 15 degrees, the water the boat was sitting in wasn't 15 degrees. How much ice was around your boat? No ice, the water probably was only slightly below freezing. Mix salt water with antifreeze and you're probably needing below 15 degree water temperature to make it freeze. If it was 60 degrees in the engine room, I don't see it freezing with 10 degree water temperature.

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Old 01-23-2022, 06:16 PM   #4
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there has been alot of ice around the boat in last few days. They just dropped in the bubblers....i just noticed the dripp around the time they just put in bubblers
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Old 01-23-2022, 06:32 PM   #5
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there has been alot of ice around the boat in last few days. They just dropped in the bubblers....i just noticed the dripp around the time they just put in bubblers
Ok, that's surface ice caused by water cooling from 15 degree air. If you use an infrared temperature gun on the seacock, doubt you will see a temperature below 25. Check the temperature on the strainer.

Btw, how do you think he filled the strainer with antifreeze when the seacock was open?

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Old 01-23-2022, 06:47 PM   #6
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Does your strainer have a drain? Any chance the bowl was removed and the screws were over tightened when it was put back on?

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Old 01-23-2022, 06:53 PM   #7
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Those bowls are known to crack after years of use.
If it wasn't replaced recently I will bet it is a coincidence. I have replaced a couple smaller and three larger engine bowls on my '08 MS with the same strainers.
If you havent replaced any bevsure to check the others carefully.
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Old 01-23-2022, 07:00 PM   #8
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If all you suffered was a cracked 'plastic' strainer body, consider yourself very lucky. Of course I would point it to the yard and ask them to replace the 'plastic' body but I wouldn't make a big stink about it. It is next to impossible to prove it was not cracked before hand. Of course you should point out that the hull valve was left open and not doubt contribute to the event.
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Old 01-23-2022, 07:00 PM   #9
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the others look good. I just ordered a new one
$ 168.00...
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Old 01-23-2022, 07:11 PM   #10
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i though about the same issue about "how do you think he filled the strainer with antifreeze when the seacock was open?"
it couldnt have been done open..
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Old 01-23-2022, 07:13 PM   #11
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I don't think it froze. First of all, it's pink, so mostly antifreeze. Maybe there's a little salt water mixed in. If the ER is 60, and the water at the level of the intake isn't frozen outside the hull, how could the water and antifreeze that far inside be frozen? I suspect the crack is from another cause. Could still be the mechanic's fault, and it would be decent of them to replace it, but don't beat them up too bad on this. Your argument isn't strong and you may be making a false accusation.
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Old 01-23-2022, 07:29 PM   #12
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Thank you all, i guess just throw money at it and replace . It could have been worse.
Could also just be coincedence ?
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Old 01-23-2022, 07:30 PM   #13
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i though about the same issue about "how do you think he filled the strainer with antifreeze when the seacock was open?"
it couldnt have been done open..
If you took the lid off the strainer with the seacock open, would water flow into the boat from outside or is the strainer above sea level?

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Old 01-23-2022, 07:34 PM   #14
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yes water would flow out if i unscrew the top, with seacock open
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Old 01-23-2022, 07:42 PM   #15
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A lot of people get away with looking at the color of the antifreeze and thinking that because you see pink or blue it is good. When we did cold storage we tested every item individually with a refractometer to see what the freeze point of the antifreeze was. All the time when you first see color it would test +20 to +30 degrees. We would keep adding antifreeze until we had at least -20 to be sure it wouldnít freeze. So just because there is pink in the strainer doesnít mean it is properly protected.
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Old 01-23-2022, 07:46 PM   #16
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yes water would flow out if i unscrew the top, with seacock open
So, one would assume that the yard closed the seacock, drained the strainer, and either poured antifreeze in the strainer while the engine was running or replaced the lid with one attached to a hose will a bucket of antifreeze.

Question is, after replacing the strainer lid, why did they reopen the seacock? I would have a friendly conversation with the yard foreman to understand how they winterized the engine and why the seacock was reopened. There might be a logical reason, such as moving the boat in an emergency.

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Old 01-23-2022, 07:46 PM   #17
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In the photos, sorry, I cannot determine the location of the crack.
If the crack is at the top lip where it is screwed into the bronze part.... it could be a problem with misalignment of the holes between the bowl and the bronze body. I have seen it happen. When replacing the bowl, make a close inspection and if necessary and possible, enlarge the holes to fit, removing the strain on the lip of the bowl.
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Old 01-23-2022, 08:39 PM   #18
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Check all of your strainers carefully. Replaced all of mine last year on our 2005 Mainship 34T and all of them on my neighbors Mainship 2008 400. Cracks were found on the back side, so never noticed from the front until they started weeping.
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Old 01-29-2022, 09:58 AM   #19
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For $168 you now have something that will last for many years, as opposed to something that has done good service for many years. You improved your boat. And if you can't afford $168 you're in the wrong sport!
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Old 01-29-2022, 10:27 AM   #20
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yep ! already bought the bowl .
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