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Old 23 August 2019, 02:21   #1
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Hull filling with water - any thoughts?

I have just taken my Mercury 420 Ocean Runner off the water after a fantastic 2 week holiday in Salcombe. Everything went really well as it was brand new to us this year, so I was a little apprehensive!
When I got it back on the trailer I opened the bung in the back, and I reckon there was 30+ litres of water came out from underneath the floor!!
There is no oblivious point that water can get into this void that I can see and I wondered if anyone had any advice as to whether this is a problem or not?
Thanks in advance.
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Old 23 August 2019, 02:48   #2
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Water gets into all hulls, that’s why there is a bing. When I bought my RIB I took the bung out over 250 L poured out!
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Old 23 August 2019, 02:55   #3
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Originally Posted by Simonh66 View Post
Water gets into all hulls, thatís why there is a bing. When I bought my RIB I took the bung out over 250 L poured out!
Thatís reassuring.
I did think the bung was there for a reason but was alarmed how much came out!
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Old 23 August 2019, 03:34   #4
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Originally Posted by Springwick View Post
Thatís reassuring.

I did think the bung was there for a reason but was alarmed how much came out!


Personally I wouldnít be reassured, Iíd be worried if my hull acquired 30l of water in a couple of weeks. Hullís shouldnít leak. If water is unintentionally getting under the deck, thereís a problem.
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Old 23 August 2019, 03:50   #5
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Personally I wouldnít be reassured, Iíd be worried if my hull acquired 30l of water in a couple of weeks. Hullís shouldnít leak. If water is unintentionally getting under the deck, thereís a problem.
I think I will contact the dealer and get their opinion.
I did think it was a bit excessive but that the bung was there for a reason.
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Old 23 August 2019, 03:51   #6
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Quote:
Originally Posted by Springwick View Post
I have just taken my Mercury 420 Ocean Runner off the water after a fantastic 2 week holiday in Salcombe. Everything went really well as it was brand new to us this year, so I was a little apprehensive!
When I got it back on the trailer I opened the bung in the back, and I reckon there was 30+ litres of water came out from underneath the floor!!
There is no oblivious point that water can get into this void that I can see and I wondered if anyone had any advice as to whether this is a problem or not?
Thanks in advance.
I had this happen on one of my old Ribs. Sadly not the best outcome. many ribs are sandwiched together with with the deck basically glassed to the hull. The tubes are then put on. In the case of my boat there was a flaw in this process that meant was a leak under the tubes which allowed water ingress. The boat was basically written off under warranty as it was an uneconomical repair. To establish where the leak was we left the bung in and filled the hull with water. Eventually water started dripping from under the tubes. Of course there maybe some other explanation like a leaky bung or the boat was stored outside with the bung in during some heavy weather. Either way, make sure you get to the bottom of it in the warranty period.
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Old 23 August 2019, 03:55   #7
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bungs sometime leak and need re-sealing or renewing was it rain water or salt water.
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Old 23 August 2019, 04:42   #8
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Quote:
Originally Posted by Simonh66 View Post
Water gets into all hulls, thatís why there is a bing

Not necessarily true.
I bought a 21yr old regularly used Osprey Viper. No bung, built that way. Fearing the worst, I drilled below the waterline to insert a bung. Not a single drop of water came out, and thankfully none has entered since. Lucky, maybe yes. Testament to the Osprey build quality, absolutely.
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Old 23 August 2019, 05:21   #9
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Quote:
Originally Posted by Springwick View Post
I have just taken my Mercury 420 Ocean Runner off the water after a fantastic 2 week holiday in Salcombe. Everything went really well as it was brand new to us this year, so I was a little apprehensive!
When I got it back on the trailer I opened the bung in the back, and I reckon there was 30+ litres of water came out from underneath the floor!!
There is no oblivious point that water can get into this void that I can see and I wondered if anyone had any advice as to whether this is a problem or not?
Thanks in advance.
Something is not right, I had a 420 for 3 years and there was never a drop of water in the hull void.

With the weather we have had I would guess its rainwater getting in from a badly fitted console or seat.

It is still under warranty so take it back to the supplier.
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Old 23 August 2019, 05:36   #10
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Worth checking there is a rubber gasket on the bung and it hasnít flattened or perished. Regularly have to replace mine to prevent water entering the hull as the bing is below the waterline for ease of draining the hull should any water get in.
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