Rinnai double mantle lantern losing pressure

Discussion in 'Fettling Forum' started by newfie, Sep 16, 2019.

  1. newfie

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    I recently acquired a double mantle red/green Rinnai lantern.

    I took it apart most of the way. I removed the pump assembly and NRV/check valve. I thought the NRV had an o-ring or pip but I didn't see one.

    When I try to light it, it only stays lit for a few seconds. I opened the fuel cap after a few minutes and there's almost no pressure left so I'm losing pressure pretty quickly.

    Is there a magic trick to rebuilding one of these that I missed? I've got tons of experience rebuilding a Coleman lantern but not one like this.

    Also, it came with a Coleman globe from a 220/290 sized lantern. Looking at the Rinnai's burner frame it appears that the Coleman 220/290 globe is just a bit too short. It's also a bit too narrow at the topnof the burner frame. I gather that the original globe had a slight taper at the top and is a bit taller than the Coleman globe? Can anyone confirm this?
     
  2. JEFF JOHNSON

    JEFF JOHNSON United Kingdom Subscriber

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    Photographs will help us to assist you.
     
  3. newfie

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  4. newfie

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    I'll get some pics of the globe and frame too.
     
  5. Norman

    Norman United States Subscriber

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    @newfie

    You might want to have a look at the filler cap gasket because it will most likely need to be replaced.

    Nice looking lantern.

    Cheers,
    Norman
     
  6. newfie

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    I forgot to mention that I tried a Coleman cap with new seal and I still lost pressure.
     
  7. Henry Plews

    Henry Plews Subscriber

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    Have you tried a dunk test ?

    Plenty of pressure and hold the tank under water - air bubbles will show you were it's losing pressure from.

    Henry.
     
  8. george

    george United States Subscriber

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    I have one of these out in my shed, somewhere... I'm not sure about the globe. I'll check in the morning and see what's in there but I can't remember a tapered globe, but I could be wrong. It's been years since I played around with the lantern.
    Yes, Henry is right! The dunk test will tell where the leak is located.
    Another thing, I seem to remember that damn pump was sort if a nightmare for me and was one of the reasons I stopped playing around with it. Couldn't seem to get it to pump up.. Hummm...
     
  9. Mackburner

    Mackburner United Kingdom Founder Member Subscriber

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    Yes the pumps on these are trickey and not the same as a Coleman. They do however lock down if used correctly. If that is not locked the lamp could well lose pressure. It has been many years since I played with my two Rinnais lanterns so I can't remember exactly how they work but I do remember they were difficult to understand at first so I would look there for leakage in use. All the rest is pretty much the same as a Coleman so should be no problem for an experienced Coleman user. ::Neil::
     
  10. george

    george United States Subscriber

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    Newfie, I haven't forgot about the Rinnais lantern, just having a bad day (pain). I will check, though.
    ](*,)
     
  11. newfie

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    No rush. I'm out of town for a couple of days.
     
  12. george

    george United States Subscriber

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    Okay, Newfie,
    I found my Rinnais lantern. The globe is unmarked; however, I think it could be original to the lantern.
    First, let me say, a 220/228 Coleman globe will fit. It's the same diameter. There is no "tapering" of the glass, it's straight sided; however, the 220 globe is about 1/4 inch shorter than the Rinnais globe.
    Yes, the pump is an unnecessary pain in the ass! Why they didn't use the same design as Coleman, I don't know. It sure wasn't copyright or patient violation (I wouldn't think, anyway).
    Hope this helps. When you look at the lantern it does look like the glass is "tapered", but it's not. The cage really makes it looked tapered. The cage support rods are tapered.
     
  13. newfie

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    Thanks George!
     
  14. newfie

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    Thanks everyone else too!
     
  15. Mackburner

    Mackburner United Kingdom Founder Member Subscriber

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    George sent me this image of the pump instructions for Rinnais product. This is from a stove but the pumps are the same. ::Neil::
    !!Rinnai pump instr from tank.jpg
     
    Last edited: Sep 20, 2019
  16. Peter Lucchini

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    It still has a check valve right?
    I have a Coleman single burner stove that is loosing pressure from the check valve.
     
  17. Mackburner

    Mackburner United Kingdom Founder Member Subscriber

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    Yes there is a check valve at the bottom of the pump tube. I think it's about the same as a Coleman. They do tend to be very tight and difficult to remove but they often improve of you shove some acetone or carb cleaner through it. ::Neil::
     
  18. Norman

    Norman United States Subscriber

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    @newfie

    I have a Rinnai double mantle lantern. It is missing the fuel cap/filler cap and I did try several Coleman filler caps and the thread pattern is different and the bung is a bit smaller then the Coleman fuel bung.
    This may be most of your problem with loosing pressure.

    Cheers,
    Norman
     
  19. newfie

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    I think my problem might with how I lock the pump. Or what I should say is my failure to lock it. I didn't know it was setup that way.

    Thanks for the graphic George and Neil.

    I'll test it this weekend.
     
  20. Norman

    Norman United States Subscriber

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    I found that the washer, DSC09241.JPG DSC09248.JPG , was as hard as a rock and this is where I was losing pressure so I replaced it with a Viton O-Ring that I had available. DSC09249.JPG DSC09250.JPG It is a nice fit. Once it is reinstalled it should last many years.

    I also checked the pip and found it was still in very good shape so I left it as is.
    DSC09244.JPG DSC09246.JPG

    I did try to light the lantern up but it would never settle down so I checked the generator/vaporizer and found the jet/nipple aperture way over sized so it was no wonder that all I got was yellow sooty flames. Since these generators are no longer available I will have to figure out what to do from here.

    Cheers,
    Norman
     
  21. george

    george United States Subscriber

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    Your NRV has a "cross" on it. I know that's where you put the removal device/screwdriver. Mine is not like that. Mine has one place for a removal device. No big deal, I guess. They do appear different though.
     
  22. Norman

    Norman United States Subscriber

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    Hi George,

    I've solved my missing fuel cap problem and by replacing the old hard washer with a Viton O-ring I've also solved my air leak. The tank will hold pressure now. I'm hoping that someday I will be able to find an original filler cap for this lantern

    My next problem is the over sized jet aperture. The generator is in good shape except for the jet. AGM jets have a similar thread pattern so I could alter one of my spare jets or I could peen the original jet and I'm leaning towards altering the AGM jet. I'll get it figured out sooner or later.

    For now I need to dismantle my Rinnai lantern and deal with the excessive dried up fuel leftovers. Of course there may be a mud dubbers nest inside the fuel tank and the best way to get rid of a mud dubbers nest is to use Hydrogen Peroxide. The filler cap was missing for who knows how long.

    Cheers,
    Norman
     

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