My reliable rm stove burner riser thread has started leaking. Normally a slight nip with the small spanner is sufficient but now a good tighten is required. There are still 3 or 4 threads showing of what I thought was a tapered thread. It does however feel and look like the male thread is bottoming out in the female tank thread. I am considering carefully shortening the male thread by 1mm or so. Not sure what the best solution is, any ideas gentlemen?
The would be good to rule out the female tank fitting first of all- hairline cracks -gulp- can occur with these tapered joints.
Thanks for prompt reply. I had watch the leak repeatedly and it does appear on the threads and not on the fitting in the tank, good idea though. The leak stops after tightening it a bit more, maybe not a cracked or split tank. I guess this is why most stoves use a lead sealing washer instead of taper threads. It is an older rm stove with a brass pump handle rather than plastic.
Well, after shortening the riser thread a little with no success it appears the thread is not tapered after all. It appeared to seal by the tapered internal surfaces meeting and forming a seal. A bit like some pipe unions work. The riser had an internal taper that appeared to seal against the internal tank fitting tapered tube. So I am trying to find an RM replacement, there is replacement primus 210 risers on ebay but not sure if these are the same thread. I only finger tighten and then spanner tighten very lightly, just beyond finger tight to seal. But I will never know how much it was tightened to the stoves long history.
Be careful with those "after market" 'ebay 210 risers' . I got one of them few years back. Burner end thread was very poor quality and it was very difficult to screw burner into threads. It worked by using very extensive force. I almost damaged the burner.
Thanks afterburner, the quality of replacement new parts can vary dramatically. Will keep looking for a replacement, would like to keep the old British made stove going.
Base-camp.co.uk or fogas.se might have 'old stock' risers that have threads that work without problems.
