Hi, I might be looking for problems where there aren’t any but…. I’ve had this stove for a few weeks. As soon as I got it I stripped it and put all the working parts in the ultrasonic and replaced the cap washer etc. I did try it first and it worked fine although covered in a layer of black soot. Anyway yesterday I fired it up and I noticed a small flame under the head causing a black soot mark on the heat shield. On further inspection there was a couple of other small flames that continued after the stove was turned off. Could this just be normal unburnt fuel vapours burning below the head because of the pressure or could I have fine hairline cracks, but surely they’d go out when the stove was turned off? In the photo’s the flame looks yellow but it isn’t it’s blue around the burner cap. Any help would be appreciated.
@Dave Gidman It’s a pinhole/crack - one or more - at one (or more) of the burner’s brazed joints. The flame persists for a while after the burner’s shut off because of the residual pressure in the burner tubing. I’d something similar with this Optimus burner on a #155 stove. Pinhole located, the spot was cleaned prior to silbrazing. Silbrazing set-up, large paraffin blowtorch to get the whole burner to a dull red heat … … then a MAPP blowtorch to provide the intense local heat to get the low silver content (30%) braze filler rod to melt. It requires that grade of rod to cope with the temperature the burner gets to when in use on the stove. Fixed. John
Brilliant, thanks for the reply. Looks like I’ve got to learn how to Silbraze! I’ve got a few pinholes I think according to the small flames. Looks like I’ve got my work cut out. It’s nicece to learn a new skill though.
Amazon! Hopefully the right type. It says 30%. Now watching YouTube vids on brazing. Berniedawg as usual! I’ve soldered before but brazing I think I did in metalwork at school 50 years ago!
Or B&Q in the UK (plumbing section). They’re flux-coated rods, which I like for convenience, but use the usual type too requiring powdered flux made into a paste with water.
I had to do this repair on my 199. I was able to get it hot enough with a 100% propane torch. I did it inside my garage, within a square of house bricks. I don't know what silver solder I used. Have fun.
I’m not an engineer or anything but I’m looking forward to it. Just got to get a blow torch now. It opens up a whole new world of fettling for me. I’m looking forward to learning how to silbraze now I know that’s the problem. It does look like I’m going to have to expand into a shed though and take this a bit more seriously. I’m gathering quite a little workshops worth of fettling kit!
