200A and 202 reproduction
frames back
in stock.

hikerduane
My recent AGM carbed lantern ran fine a couple weeks ago after I got everything to move.  Last night, it was leaking at the base of the genny, today, I see the light leak is coming from the threads of the packing nut.  Have tried a couple thread sealers, annealed the flared end, tried two other gennys, they leaked worse.  Tried some graphite paste I have had for quite awhile, will see later if it holds.  A fix?  Or is there a issue with the fitting the genny screws into?
Power is out, so firing up some lanterns.  I see the globe on my 237 has a crack!  🙁
Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
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JimL
I can't address AGM, but to resolve a leak with a very old R55 on a lamp, I tinned the male threads on the generator.  It works just fine and no leaks.  Perhaps you can do something similar with the male threaded portion.

-Jim

Flammable liquids, open flame, what could go wrong?


I've missed you!  But I'm reloading.
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hikerduane
I've used Teflon paste, graphite paste and two other gennys, they all still leak.  Wonder if you are thinking just the last few threads on the nut to be tinned.
Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
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JimL
I don't think tinning all the threads will be a negative impact because the solder is soft, and will likely squish out of the way if need be.  I have not removed the generator since tinning the threads, but do expect to have to re-tin them if/when I do, provided I want to re-use that generator yet again.  I have spare R55's and Q77's, but hey, this generator works fine, so I might as well try to use it up.

-Jim

Flammable liquids, open flame, what could go wrong?


I've missed you!  But I'm reloading.
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Tgarner01
Does the generator not have a flare that seals like a Coleman?
Toby Garner
ICCC #1939
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hikerduane
Genny is flared, I see a tiny bit of deformity though, maybe from removing it in the very tight confines this lantern has for R&R the genny.  I sure would like to tidy up the flare.  Power is out here still, so last night after shutting my generator down, I worked by 200A light.  All the plumbing for this lantern looked clean, did steel wool clean the carb/fa tube before reinstalling parts.  Must have gotten the genny lined up good because with my old eyes, I could barely see the ever so slightest bubbling around the packing nut, so happy.  Wondered  if the genny wasn't perpendicular to the valve, causing it to not be aligned very good.  Lantern was cantankerous starting, but finally kept going.  Does have a rhythmic surge I noticed.  Thanks for the suggestion.
Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
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Tgarner01
If your leak is at the generator nut I can't help but think your issue is with the flare... The threads should have nothing to do with sealing.. Unless the threaded body itself is cracked... But you also mentioned a packing nut? Maybe I'm missing something...
Toby Garner
ICCC #1939
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hikerduane
I agree that the flare is the issue, just have never seen a leak thru the threads just around the tube.  Don't see a crack in the genny tube.   Like I mentioned, I think part of the issue may have been that the genny wasn't vertical enough, although all looked perfect.  Sorry for calling the generator nut a packing nut.
Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
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Tgarner01
Okay, I think I'm catching up with you now. I had a generator awhile back that had some flare sealing issues... I ended up running a flare tool over the existing flare and fixed it... Like you mentioned probably had been tightened crooked or dropped be a PO.. might be worth a shot. Also look at the flare surface of the eccentric block closely for imperfections.. I run into this a lot in automotive brake systems that someone else has been messing with..
Toby Garner
ICCC #1939
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hikerduane
This uses a genny similar to a R55.  I wish I had a flaring tool or had a ball bearing.  I also tried two other gennys which leaked worse, seat area looks good.  Working for now.  Off to shut my generator off for a few hours.
Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
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Tgarner01
Two different generators leaking makes me think it's the eccentric flare giving the issues. I tinned one on an HGP awhile back that fixed it's leak. Not sure if that lantern will run hotter in that area to affect it or not...
Toby Garner
ICCC #1939
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zoomkat
" Have tried a couple thread sealers, annealed the flared end, tried two other gennys, they leaked worse."

I usually try to carefully seat the generator flair on the valve surface. When finger tightening the generator nut, I pull up slightly on the generator while tightening the nut so the flair is against the nut as the nut moves down. When the flair touches down, I use finger feel to determine if the flair is going to seat on the valve surface in a vertical position and not cocked or bound. I'm not familiar with the generator in question, but one might try lightly dressing the flared connecting surfaces using automotive valve grinding compound using a drill to spin the generator. If I wanted to try a quick solution, I would lightly coat the inside surface of the flair with some joint compound, carefully seat and tighten the generator, then pressurize the generator with air to force the joint compound into any leak passages in the flared connection. 
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JimL
With the leak on mine, I don't know why it was leaking only at the threads and not in the center where the generator tube went through the nut.  However, tinning the threads resolved it.

Duane,

What did you and up doing to stop the leak?

-Jim

Flammable liquids, open flame, what could go wrong?


I've missed you!  But I'm reloading.
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Northman49
I make my own Q99s and  the generator nut (hex head). Some will leak no matter how much I tighten...so I put a small 1/4" lead washer with a tiny hole in the center (see my post on lead washers) between the valve and the flare.. This seals the flare even when the flare is ragged and you avoid over tightening and stripping valve thread. Works for me. You can remove the washer anytime with a dental pick or similar object if desired without damaging the valve threads. IMG_4012__1599677076_41066.jpg  IMG_4015__1599677123_90719.jpg 
She was only a moonshiner's daughter, but I loved her still.

I keep my tools sharp...but my mind sharper!
  Ed
                 ICCC no.1880
                 CANADIAN BLUES Member #023
     
                  Mil-spec ops #1982
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hikerduane
The/a AGM genny is very much like a R55, but the lever is mid genny instead of at the bottom.  Did nothing to seal it as it is now ok, so luck!  Good point about placement of the flared end as the nut is tightened.  I try to seat the end before tightening the nut.  I had a thought on what to place under the flared end as I have lead washers for my Euro stoves.  Thank you for the options, seems to be working for now except the pulse.  It fired right up this morning.  Quick lunch then turning the generator off again, back tonight.

Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
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zoomkat
"Must have gotten the genny lined up good because with my old eyes, I could barely see the ever so slightest bubbling around the packing nut, so happy."

Small leaks at the generator nut are usually a culprit when the lantern is a "stinker", aka, having some smell of a little unburned fuel when operating.
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VincentMechanic31

That’s good news, Duane. I’ve fought that same issue as you and these guys have w those AGM generators. Good advice here for those w similar AGM issues. 

Flashing back to the pricker war I fought w one a few years ago.

In fact, we could re-title this thread: “Why Vince Sold off (most of) His AGM Lanterns”. 


I just found them too unpredictable to be worth the trouble. Glad other folks enjoy them. 


Best,

Vince. 

"We are here on earth to fart around, and don't let anyone tell you any different" -Kurt Vonnegut 

- VincentMechanic31 (Vince) 
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hikerduane
I thought I had other AGM's, but those are Nulites.  
I did notice a tiny bit of fuel around the nut this afternoon, not much.  Yet.
Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
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