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Old 10-09-2017, 06:15 AM   #1
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Swift Trawler 42 - Leak under lazarette floor

Hello All,

I have a 2006 Beneteau Swift Trawler 42 (US Assembled).

Between the center stringers in my lazarette, just behind the raw water strainer for the generator, the prior owner had a 10" x 10" square cut into the fiberglass subfloor and installed a bilge pump. It seems water was leaking (from somewhere) into the space between the inner fiberglass shell, and the hull.

The leak is slow, maybe 1/2 gallon per day, and does not seem to increase when the boat is in motion. The added bilge pump takes care of the issue, but I'd rather find the leak!

I've checked in the transom area around the rudder posts, screws that hold the trim tabs, etc. and that area is dry. On the haul out when I purchased the boat (April 2017), they checked the strut mounts, the thru-hull for the A/C raw water intake, and the ground plate screws from under the boat and everything seemed sealed. Unfortunately, these go through the inner fiberglass hull liner, so it's not possible to inspect the actual inside hull attachment.

I'm wondering if any other ST 42 owners have experienced a similar problem, and if so, if you found the source.

Thanks in advance!

Tom
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Old 10-09-2017, 06:27 AM   #2
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Is this Beneteau version a solid FRP or cored hull? Did the boat survey discuss this issue and probable causes?
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Old 10-09-2017, 08:40 AM   #3
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Is this Beneteau version a solid FRP or cored hull? Did the boat survey discuss this issue and probable causes?

Hi, the hull is "foam" corede and the deck and superstructure are cored with balsa. I do not know the true hull points, I hope solid structure there.

NBs
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Old 10-09-2017, 09:30 AM   #4
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Hi, the hull is "foam" corede and the deck and superstructure are cored with balsa. I do not know the true hull points, I hope solid structure there.

NBs
Not 100% sure, but I believe Beneteau specs the area below the water line as solid, and no core material.
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Old 10-09-2017, 10:21 AM   #5
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I take it you have checked to see if it is salt water or fresh?
Where are the AC condensate drains?

Have you consulted the factory, especially on accessing "the inner fiberglass hull liner"?
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Old 10-10-2017, 07:55 AM   #6
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Thanks all for your questions.

Attached are some photo's of the area in question.

There are three layers in the lazarette.
  1. Top fiberglass gelcoat shell. About 1/8" thick. it's thin enough that it's cracked through and is springy when stepped on.
  2. Air gap. About 1/2", partially filled with 5200 or something similar. (The 5200 stuff looks factory original as I can see the pattern of the top fiberglass layer where it's been removed).
  3. Fiberglass hull. (where the bilge pump and switch have been screwed in)

The water is flowing into the gap between the layers (not from the of the top layer). I've wet-vac'ed the area dry, and it takes about an hour before you see the first signs of water. I've also checked all of the hoses, pumps, strainers etc in this area and find no signs of leaks. All of these are above the top shell.

The actual bilge for the boat is in the keel which is lower than this area by a good 8-10". This area is at the same level as the engine room floor, and is separated from that by a stringer. Given that the bilge is relatively dry, I'm pretty sure that this area is isolated from the engine room/bilge area.

I have not spoken to Beneteau on this. I will try to find a US contact for them and see if I can get some "Support technique".

Here are a few photos of the area with the problem. Note that the gap is large enough that I can stick my finger into it.







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Old 10-10-2017, 08:09 AM   #7
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Answers to a few more of the questions:

- When we put in new transducers (more forward than this position), the hull was solid fiberglass.

- The survey called out the bilge pump in the area as needing a new float switch. But did not discuss that it should not have been there in the first place. I'm the third owner, and the survey from when the last owner bought it shows the pump, but also does not discuss the source of the leak. So this was installed by the first owner who had the boat for about 2 years.

- I'm in fresh water, so the water is fresh, but when we first looked at it, the boat was in salt water, and the water was salt. While there are hoses and pumps in that area, they are all above the top shell and show no signs of leaking.

- There are two visible thru-hulls in this area. The raw water intake for the air conditioner, and a 1/4" bolt with a ground wire on it. From photos of the haul-out, it looks like the ground plate.

Currently my chief theory is the raw water through hull for the A/C is leaking.
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Old 10-10-2017, 08:59 AM   #8
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Quote:
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Currently my chief theory is the raw water through hull for the A/C is leaking.
Two questions
1. Can you isolate the AC through hull and monitor it for leakage?
2. What is the purpose of the liner or false bottom?

Also you may want to look into how the various under water through hulls were installed, both during the build and aftermarket. It is not uncommon that poorly installed through hulls have to be removed and properly rebedded.

In some cases backing blocks were not used and the piping flexes in the hole eventually leading to leakage. Unfortunately common and if hidden from view a potential disaster waiting to happen.
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Old 10-10-2017, 09:23 AM   #9
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Thanks Sunchaser!

1) The purpose is mostly cosmetic to make the area smooth. Removal is not really an option as it would require pulling the generator and fresh water tanks. the liner covers edge to edge of the whole back of the boat and wraps the stringers.

2) It might be possible to cut the top layer around the through hulls to see if that's where it's coming from. I'm hoping to find another ST 42 owner that had the same issue and has already found the problem to avoid doing a lot of cutting.

On my next haulout I'm going to have the through hulls in that area replaced and rebedded, it can't hurt and it may solve my problem. When they do that I'm planning on having them remove the top liner in that area so that they don't have to pass through two layers of material with a gap. I'd hope that they put some sort of flange fitting to sandwich the actual hull, but I can't see it with the top layer.
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Old 10-10-2017, 05:50 PM   #10
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..... I'm the third owner, and the survey from when the last owner bought it shows the pump, but also does not discuss the source of the leak. So this was installed by the first owner who had the boat for about 2 years....
The boat would have been under warranty with the original owner, who resorted to the bilge pump fix. It`s a desperation kind of "solution", "we can`t fix the leak but we can pump out the water it lets in".
I hope you solve it, it`s quite possible Beneteau could not. Can you contact the original owner for more information?
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Old 10-12-2017, 09:57 AM   #11
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Had the same problem last summer-looked everywhere!!! finally found it after pulling the aft lazarett outboard apart and crawled outboard-the leak was coming from the starboard exhaust flange!! Under the 8in hose found constant drips at rest but underway it leaked 5gpd.
Pulled the boat ,pulled hose off,unbolted /pulled the flange(no cracks),rebedded and reassembled. Not drop since!
Bob N-LindaLee 2005 Beneteau 42
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Old 10-12-2017, 03:12 PM   #12
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Originally Posted by reelcompromise View Post
Had the same problem last summer-looked everywhere!!! finally found it after pulling the aft lazarett outboard apart and crawled outboard-the leak was coming from the starboard exhaust flange!! Under the 8in hose found constant drips at rest but underway it leaked 5gpd.
Pulled the boat ,pulled hose off,unbolted /pulled the flange(no cracks),rebedded and reassembled. Not drop since!
Bob N-LindaLee 2005 Beneteau 42
Any idea if this could be an issue on the updated 44? Was the exhaust design changed at all? Is it solid around it or possible water intruded into the hull itself and not just the bilge area?
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Old 10-13-2017, 03:43 AM   #13
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Quote:
Originally Posted by reelcompromise View Post
Had the same problem last summer-looked everywhere!!! finally found it after pulling the aft lazarett outboard apart and crawled outboard-the leak was coming from the starboard exhaust flange!! Under the 8in hose found constant drips at rest but underway it leaked 5gpd.
Pulled the boat ,pulled hose off,unbolted /pulled the flange(no cracks),rebedded and reassembled. Not drop since!
Bob N-LindaLee 2005 Beneteau 42
Thanks for the information. I didn't think that there was a water path from the outboard area where the water tanks and exhaust are to the center of the lazarette, but I guess that's not correct! Thanks for the information. I'll have the exhaust ports looked at when I pull the boat in the spring.

Cheers,

Tom
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