Living With Our Rapido 963f Le Randonneur Motor Home.

Thursday, 7 July 2011

Yet another plumbing leak!

So far this year, amongst other problems such as flaking paint after the winter, and faulty lcd hour meter displays, also after the winter, we have had more than our share of leaks in the plumbing system. I meticulously drain the water system before the winter lay up, so I can't blame the problems on freezing. The first ones I noticed, early on, were identified as loose joints in the HEP 20 fresh water system piping joints. The problem showed up when the water pump started to run, for only a few seconds, every couple of hours, indicating that there had been a drop in pressure. The leaking joints were found under the bathroom floor, and had damp patches under them. I dismantled each joint, checked the components, and re-tightened them, and the floor around them dried up. Then of course we had the leaking Alde central heating boiler, which turned out to be a major job. Last weekend, the water pump started to operate for a few seconds every couple of hours once more. Not again!

A look in the area around the pump this time revealed an obvious water leak in that area. All the pipe joints seemed to be dry, but if I placed my finger on the bottom of the pump diaphragm chamber, I picked up water there. Nothing for it but to remove the pump itself.
The isolation valve on the stainless steel water tank, which is located under the bow, was closed, and the HEP 20 joints which connect the pump were released, and replaced temporarily with 15mm blanking ends, so that any remaining water in the system didn't run into the bilge while the pump was disconnected.
Once off, and on the workbench, it was a simple matter of releasing the screws that secure the diaphragm chamber to the pump, and sure enough, there was evidence of a water leak. The cap is sealed to the rest of the pump by a small 1mm white closed cell foam seal, which had blackening on the underside - evidence that water had been lodged there, and then leaking out to the outside world. I didn't replace the gasket, preferring to leave it in place, and run a bead of clear silicone sealant around the mating edges of the chamber before putting it back together. I took care not to use too much, and also ensured that any excess sealant would be squeezed to the outside of the pump chamber when re-assembled. If any of the sealant had found its way into the pump chamber, when set, could cause blockage problems if it broke loose in the future. The rebuilt pump assembly was then put back into the water circuit, and left for a couple of hours before turning the water supply back on. This has cured this particular problem, I wonder what will be next?


  1. Well done! I now know where to come to have all my minor maintenance completed!

  2. At the rate we are going, I will be an expert at narrowboat maintenance by the end of this year!

  3. Useful information shared..I am very happy to read this article. Thanks for giving us nice info.
    How to find solution for plumbing leak problem.

  4. Plumbing has been around in one form or another for over 8000 years, starting with troughs and pipe made of clay and

  5. Pipes can sound an extremely insignificant errand, yet people required in these undertakings are acknowledged for making some incomprehensible assignment conceivable. dichtheitsprüfung

  6. لدينا مميزات في خدمات كشف تسربات التي تقدمها شركة ركن البيت التي تكون متخصصة فيها فتعاملك مع شركة كشف تسربات المياه بالدمام لديها امكانيات جيدة يساعدك علي التخلص من مشاكل التسريب التي توجد لديك بسهولة دون التعرض للخطر حيث نمتلك في شركة كشف تسربات بالدمام الامكانيات والفنين المتميزين الذين يقدمون الخدمة بتميز فاذا كنت فى حيرة من امر التسريب الذي يوجد لديك فعليك ان تعلم ان خدماتنا منتشرة في جميع انحاء المملكة مثل خدمات شركة كشف تسربات المياه بالرياض التي تحل لك المشاكل المتكررة المتعلقة بالتسربات فلا داعى للقلق من الان لانك سوف تملك فني جيد منزلك يحل لك كل مشاكل التسربات و كيفية القيام بهذه الخدمة وتذكر ان الحل الامثل فى شركة كشف تسربات بالرياض ان توفر كل الامكانيات التى تساعدك علي حل مشكلاتك


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