I have a 1963 Coleman 241G which hasn't run for years. Thought I'd have a go at firing it up. No success so far. The problem is that the fount/tank will not pressurize. When the hole at the end of the pump is blocked with one's thumb the pump will simply not depress. I assume that there is a NRV which is blocked? Any suggestions as to a remedy I could try? Is it necessary/possible to remove the NRV for cleaning/servicing?
sounds like the nrv is stuck,if you remove the pump push rod and look down the pump tube you will see that the nrv can be removed using a wide flat blade screwdriver,once out the valve can be split and serviced,new pips are available,or you may get away with the old one,hope this helps,tony
Thank you gents. If by "not having a positive shut off valve" you mean that the pump does not turn and lock the way other Colemans do, then you are quite correct. Knowing that there is a NRV and that it is removable helps a great deal. Hopefully I'll have time to have a go at it tomorrow. I'll report on progress. Thank you.
I know on my 241A the NRV is just like a Petromax and the same removal tool will work for it. On my 241G I haven't had it apart to see it but if it isn't like the Petromax style then it should have a slot for a screw driver. Great lanterns and lots of fun to run!
Thanks Greg. I am not familiar with the Petromax NRV but this NRV has no slot in it so I have been unable to get it out with a screwdriver as Tony suggests. The NRV in question has a circular 'nut' on top with 2 flat sides. It appears that if a metal tube with a slot in the bottom end was inserted down the pump bore and fitted over the 'nut', the slot would grip the flat sides and the NRV could be screwed out. Does that sound like the Petromax system? I could try and make a tool but being a clerk rather than an engineer, it might be easier to buy one if possible. Are these things available from The Fettle Box?
There are tools out there with a rod that goes right through and screws into the valve thread and prevents the tool slipping up and rounding the slot or in this case flats and making it impossible to remove the valve. Tye (NRV removal tool) in the little search box below Fettle Box advert you will get references to discussions and pics of tools in them
Thanks Graham. That search box opened up a whole world of helpful stuff. I'll try making my own extractor tool out of a suitable bolt. If that fails, I know that there is back-up out there!
Re-reading this thread I realize that I have flattered my 241G by four years - it is in fact a 1967 model and not a 1963. My apologies, Peter.
Both Coleman check valves and NRV as in the 241G can often be cleaned in situ. Remove the pump, fill the tube with carb cleaner, acetone, alcohol, citric acid (lots of choices) and let it sit for a day. Then pump it through. Remember to clean fount afterwards. That´ll often do the trick. 8) The 241G is a beautiful lantern, and it burns very steady and quiet. One of my all time favorite users.
The NRV on the 241A (and G?) is virtually identical to the Primus stove NRV except that it has slightly longer screw thread on the shaft which screws into the bottom of the pump tube. It should also have a lead seal like the Primus type and the rubber pip, cup and spring should be interchangeable. Beware the common Primus NRV removal tool; some of them tend to damage/round off the flats on the head of the NRV. If it is very tight you can try to soak it in penetrating oil, heat it a few times with a soldering iron and fractionally tighten it with a well-fitting tool before loosening it. I've had a few nail-biting encounters with them but with a conservative and patient approach have always managed to extract them without damage. A long forceps may help to remove it if there is a build-up of corrosion on the part that protrudes into the fount. You may also be able to push it out using a screwdriver inserted into the fuel filler hole. -Phil
