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Old 21 August 2011, 10:34   #1
Country: UK - England
Town: Cheltenham
Boat name: Rum Runner
Make: Yamaha
Length: 5m +
Engine: 135 Optimax/petrol
Join Date: Aug 2011
Posts: 1
Deflating rear quater of tube

Hi - does anyone have any ideas. I have a 5.5m Yamaha rib. The rear quarter of one of my tubes deflates quickly over 2 days. The rest of the tubes are good. I have tried the usual soapy water test but nothing showing. Sprayed soapy water over the valve and cant find a leak here either. Is there anything else that I have not tried that I could maybe spray inside or a sealer that you spray in through the valve??? All suggestions gratefully received as its stumped me!

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Old 21 August 2011, 10:55   #2
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Country: Ireland
Length: no boat
Join Date: Feb 2008
Posts: 14,432
Welcome to RIBnet Rumrunner,

As I don't know exactly what you have tried - I'll tell you what I'd do. Firstly, deflation over 48 hours is a decent leak, if you inflate the tubes to working pressure, there will be an audible hiss somewhere but possibly not enough to use for locating it (ask a child to listen - they have good upper range hearing). So pump the tubes up until your fist bounces off them - you need a mixture of washing up liquid and water - make it strong 4:1 maybe and spray it on the open areas if you wish but PAINT it on with a brush over the tapes, seams and valves. Open the valve cover before you do this. Pay attention to cone ends and the areas where the tubes meet the hull, both inside and outside. I would do the adjacent tube too as air might be passing along inside the tube/hull contact area and escaping from below the next section up - hope not though!

Pay particular attention to the areas that would be under water.

Until you know where the leak is, I wouldn't start looking for sealers etc., unless the tubes are old and knackered.
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