Discussion
Mine started once but no water was obvious at first, the lugs that the cap locks onto on the swan neck were bent a tad so the cap was not sealing, my temp would rise and the system would force the air out. Took me a while to find it though.
Edit. What does the seal look like (not the aquatic version).
Edit. What does the seal look like (not the aquatic version).
I used a straight edge, steel rule or a square and checked the seal on the swan neck. I also replaced a seal with a rubber blank that came with a pressure cap later on down the line. But as the system was not sealed due to the leak, the water expanded quite easily and would fill the expansion tank to the brim.
I may be wrong here but from my experience and understanding when mine was playing up. If the cap is not sealing then the system is not pressurising, that is water is getting forced out as the water in the system expands and a loose cap is easier for water to get by than the 15lb (?) cap on the expansion. No pressure in the system then it will not force the spring?
If you (or your kids) cycle, a temp trick is to cut a couple of discs out of an old innertube and put these in below the cap - adds a bit of spring pressure and gives you a 'new' seal. I ran my wedge that way for a couple of months it worked so well !!
But do check you haven't got a blockage somewhere, as it might be caused by excessive pressure as well as a worn cap....
But do check you haven't got a blockage somewhere, as it might be caused by excessive pressure as well as a worn cap....
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