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Finding a leak in a glass hull

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    Posted: 13 Feb 2020 at 8:56pm
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Titanium
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SO I have a 5 meter Zodiac RIB with a fibreglass hull. There is a bung for the underfloor area and this area has been filled with water last 2 times I came back from fishing - I have had a look at the hull but cannot see any obvious damage. There are two spots of repair on the gel coat from the previous owner but still look intact. Any suggestions on how to find the leak? Thanks
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Post Options Post Options   Likes (0) Likes(0)   Quote Bounty Hunter Quote  Post ReplyReply Direct Link To This Post Posted: 13 Feb 2020 at 11:10pm
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possibly the bung itself?
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Post Options Post Options   Likes (0) Likes(0)   Quote Titahi Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 12:50am
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Bung or bung housing would be where I’d start...after that it gets messy and more expensive
"I love standing by the ocean and just knowing what its for"
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Post Options Post Options   Likes (0) Likes(0)   Quote pjc Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 4:10am
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Replace bung and bung housing.i presume it is the false bottom.inner and outer?could get vaccum on blow out on bung and use soapy water on outside of hull.2 person job though.shiuld see bubbles.maybe patches look good but under pressure are leaking.
What Do mean the fish are biting today asked the Boss
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Post Options Post Options   Likes (0) Likes(0)   Quote Sufishent Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 8:54am
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Have a 15' tinny and last year came back a few times from a flat water trip and lots of water came out when the bung was removed, Turned out it was the bung fitting - didn't replace, just put lots of marine silicon around the outside and inside of the fitting. Has been fine since then. 
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Post Options Post Options   Likes (1) Likes(1)   Quote LBGer Quote  Post ReplyReply Direct Link To This Post Posted: 14 Feb 2020 at 9:49am
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Thanks for the answers guys, I did have a go at filling the compartment with water from a hose and then put the bung in to see if there was any leakage but it wasn't conclusive. I will look at some silicon around the bung or something similar and see if that makes a difference - PJC will try the soapy water if the bung test doesn't work....Cheers Scott
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Post Options Post Options   Likes (0) Likes(0)   Quote MacSkipper Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2020 at 5:49am
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Have you looked in dark - bung in very bright torch/ focussed light inside hull someone outside look for pin holes thin areas particularly around bung and join area  with chambers?
Good fishing trip nothing breaks, great trip catch fish.
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Post Options Post Options   Likes (0) Likes(0)   Quote terrafish Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2020 at 8:17am
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Checked along the keel line especially bow area?.
Had this in my boat(not a rib) last year where I went from taking on a little to taking on a little bit more.
Left water in hull and got under to look. Wipe off any dribbles and watched to see if reformed. When I found it, it turned out to be a scratch that didn't appear to be all that deep but obviously deep enough. and being on the keel line had a little more water pressure.
Amazing how a tiny leak can generate a lot of water over a few hours
I see you've already flooded to check bung, but flood again with bow down to check its not forward
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Post Options Post Options   Likes (0) Likes(0)   Quote Buggar-me Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2020 at 10:23am
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I have heard of people adding a dye or food colouring to water and filling the boat up. Made it easier to see. Don't know if it would stain though?
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Post Options Post Options   Likes (0) Likes(0)   Quote pjc Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2020 at 3:09pm
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The problem with filling it with water,I have found,is that pressure on hull is going out .seals the leak with the boat in water the pressure is pushing hull in,hence light pressure with air and soapy water.
What Do mean the fish are biting today asked the Boss
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Post Options Post Options   Likes (0) Likes(0)   Quote neil_cb125t Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2020 at 8:36pm
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Originally posted by pjc pjc wrote:

The problem with filling it with water,I have found,is that pressure on hull is going out .seals the leak with the boat in water the pressure is pushing hull in,hence light pressure with air and soapy water.

I had a leak in my old Sea Nymph - ended up being the bung reciever ...ie everytime the bung went it it "pusherised" thus breaking the seal around the back of the receiver.

Way I found it was to put internal bung in and then put a bit of water inside the boat maybe 2/3inches deep. The hull bung is out. Then get wifey or someone to to get your compressor and stick the blower up her butt ( the boats, not the mrs) and hit the trigger. Bubbles will show up where your wee leak is, if its from inside to inside the hull.
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Post Options Post Options   Likes (0) Likes(0)   Quote Big -Dave Quote  Post ReplyReply Direct Link To This Post Posted: 15 Feb 2020 at 10:15pm
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Be very careful pressurising anything.
A couple of psi can cause damage
you can't fix an idiot with duct tape, but it does muffle them for a while...
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Post Options Post Options   Likes (0) Likes(0)   Quote neil_cb125t Quote  Post ReplyReply Direct Link To This Post Posted: 16 Feb 2020 at 1:03pm
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Yes. Not aiming for blowing up your boat. Just using your hand and get a small tiny amount of pressure shows up in bubbles.

I tried dyed water etc. but the bubbles were the easiest. You can water around testing spots etc.
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