sounds daft but what is the correct distance between the mixing tube and the injector tube?Its a guardsman , I've a burner that wont burn and the injector tube touches the mixing tube and leaves a round mark on the inside of the dome,,,must be wrong but the lamp looks untouched and unbodged....
stu, pics attached ,the side by side view shows the lengths ,the end on view shows the bright ring in the mixing tubs where the injector tube is hitting it when its screwed down, should add it wasn't like that when i first checked it after buying it,the dome was loose so i tightened it up.I didn't notice the length problem until i tried to light it
That's very wrong. The tube shall not touch the "roof" of the mixing dome. There shall be a good room for the paraffin gas to enter and mix. I don't know exactly how much, but several mm. And all Guardsman I got has another, higher, type of mixing dome than you show here. They all look like this discarded one:
Thanks Christer,just got my other guardsman out of the shed roof and the cap is much higher as is the one in your photo , i wonder if the lamp has been run for years with the dome not fully screwed down as a 'fix' for the incorrect dome being fitted,as soon as i screwed it down it wouldn't burn correctly..
You could of course cut a bit of the inner tube off, but that's really not the correct way to go. I wonder where this lower dome belongs. Can it have been taken from a later burner? Like e.g. from 70´s X246B as seen [url=http://0flo.com/index.php?threads/1487 I guess the Tilley experts soon will chip in so we will know.
You need to either fit a shorter mixing tube or a taller dome, but if you do not have any of those, then just trim enough off of the tube with a junior hacksaw, Jeff.
Hi If you know someone with a lathe they can trim 1/4 of an inch off the tube or as Jeff says use a junior hacksaw just be careful not to damage the burner by knocking it out of shape , i think you have an earlier burner with a later dome but i may be wrong Let us know how you get on Stu
ok thanks ,1/4" it is ,I'll probably have a go at reducing the length as i dont have a spare dome or early complete burner
I have seen this before. Not a common fault but easy enough to do as there is some variation in the venturi tube lengths and the dome heights so just now and then a mix and match results in a choked off burner. I know we found one at Newark this year. ::Neil::
I have measured a couple of Tilley burners, one from a 1950s TL136 and one from a later X246B. As far as I can tell, the gap between the end of the mixing tube and the top of the mixing chamber (measured externally) is about 5mm (sorry, 13/64") on both types of burner. Allowing for the thickness of the dome itself, the internal gap will probably be about 4mm (11/64"). Phil
