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ke4ljh
CV LEAK ON 443/426 ERA FOUNT WITH AIR STEM CLOSED?

For those of you with far more experience than I What is going on here that I don't know about.

Air stem is rotated fully clockwise to seal CV but fount still loses pressure from the CV. I can hear the air escaping  just a little from the air tube when I put my ear to it.

Removing the pump, with air stem still installed, Air is still leaking from around the closed air stem.

Visually the leak appears to be coming from the center of the CV when the air tube has penetrating lube sprayed inside to see the leak.

When using a bamboo skewer to poke the the CV ball I can get the leak to reduce but not stop. With reduced leak the air stem will stop the leak.

However, this is not a solution because one minute the leak stops and the next the leak is back.

What is going on hear?

How do I address this challenge?

I have been soaking in penetrating lube for a week. Alternating with pumping up the fount to see if it will hold pressure.

The problem is not the fuel cap.

Your thoughts thinking and ideas.


Stephen - Florida
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Smudge
The best remedy is to replace the CV and stem. The assembly costs $4.50 at OCP. However, you may be able to hone the end of the stem valve to get a better seal. I've done this by placing the stem in a drill and holding sandpaper on the conical end to smooth it.
"If all the beasts were gone, men would die from a great loneliness of spirit, for whatever happens to the beasts,
also happens to the man. Whatever befalls the Earth, befalls the sons of the Earth.” - Chief Seattle

ICCC # 1726  -  Bernz0matiC Appreciation Club #057
Perfection Heater Collectors #6
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hikerduane
Try carb cleaner, top shelf stuff, push thru with the pump or better yet, remove the c/V to soak in Berrymans, rattle around, should take under 10 minutes. Also, thinking maybe a bit of crud stuck too.
Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
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ke4ljh
Karen,

That's an easy option. I'll start there.


Duane,

I don't know what Barrymans is. What does it do well that your recommending it as an option.

I have been pushing PB Blaster through the CV with the plunger. The issue just does not go away permanently. It comes and goes.

Me thinks the least cost option hear is a new CV valve. Fix the old one up for later if possible.

Stephen - Florida
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mikew
Look at the end of the valve stem where the seat is to see if there is a worn ring there.  If so, it can be resurfaced easily.  

Also, the CV may need to be removed and physically cleaned.  I have also had a couple of CVs that did not seat enough to suit me after they were thoroughly cleaned.  A couple of years or so ago, a member here posted a way to fix this and I used this successfully a couple of times .  The cleaned CV was placed with slotted end down and discharge end up on my workbench.  A small brass punch was inserted in the discharge end to push the steel ball against the brass seat.  The punch was given a LIGHT tap to make the brass seat form fit better to the steel ball.
Mike
"... at evening time, it shall be light." Zechariah 14:7

Slant Saver #05 Milspec Ops 0045
Quicklite Crew #27
Perfection Heater Collectors #4
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Eel
^^^ What Mike said.  Your CV rod is feelin' groovy.  Resurface tip of CV rod with sandpaper and popsiclestick/PCB/whatUgot.  Better still, if you solder well, tin the tip of the rod.

EEL Eclectic Lanterns, div.  Doofenshmirtz-EEL Incorporated.

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hikerduane
Berrymans is a product to clean carbs, fuel system parts. Should be in a auto parts store, I spray some in a small container, enough to submerve the c/v in if removed from the tank, otherwise can try pushing some thru with the pump. This is NOT a job for penetrating oil.
Duane
Duane-All seasons, year round backpacker and camper.  So many stoves and lanterns, who's counting.
Quote
ke4ljh
Cleaned the tip of the stem with emmory paper. Yes, just short of the tip there was a groove. Most of the groove has now been sanded out just a faint hint of it's presence remains.

Upon pressurizing the tank again the CV did not leak after poking with bamboo skewer, but when air stem was re-installed as the stem was bottoming out in the threads it was pushing against the ball bearing opening the CV further, and still not sealing.  The leak is coming from the center of the CV.

Below is the pics of my air stems from on the left 413G and on right 443/426. The one on the left is the stem and CV at issue.
They are not the same size.

Would a current standard replacement CV and Stem fit this fount. The larger stem is from the earlier 443/426 fount.


Stephen - Florida
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Smudge
Here isn a link to the CV and stem that shoulf fit a 413G.
https://www.oldcolemanparts.com/product.php?productid=42&cat=&page=1
"If all the beasts were gone, men would die from a great loneliness of spirit, for whatever happens to the beasts,
also happens to the man. Whatever befalls the Earth, befalls the sons of the Earth.” - Chief Seattle

ICCC # 1726  -  Bernz0matiC Appreciation Club #057
Perfection Heater Collectors #6
Quote


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