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  • Wing Tank revelation, embarassment, mystery, and more

    [Warning long wordy post]
    First of all hey Tribe, love you guys! Now where to start? After getting my bird back in the air after being grounded for around 5 years due to hail damage, a year of happy flying went by and it was time for annual again. Some life things happened which kept be from being proactive about it. When I got serious, the wonderful AI that helped me last had disappeared from the face of the planet. Couldn't find anyone who would either work on my 46 BC12D (at my home airport), or would do it for a reasonable price. Bought another plane in the meantime, but finally found a local old timer willing to help me out... eventually (on his schedule), but the price was right.

    Anyway I was in the middle of an owner assist working on tasks as assigned, when I hear him say "this wing tank cap needs a new seal". I said "OH! The wing tanks are in-op. Have been since I bought it. I am surprised you even got the cap off. I have always been afraid to force it."

    See when I bought the plane ~17 years ago, I was told the wing tanks were in-operable due to corrosion. I accepted it as evident by the rusty fuel caps, and have been running 12Gal main all these years.

    The old timer said the tank looks fine just seems that it may need the caps cleaned up or replaced, and the tanks flushed. We both took a look and sure enough the rust seen internally appeared to just be what had fallen in from the caps. He said he thinks the tanks are aluminum and he would use them if he were me.

    This afternoon for the first time since I have owned the plane, I decided to try to remove the 1/8NPT plugs. First one (Left) put up a fight, but I prevailed. The right one put up a bigger fight and I lost. It will need to be drilled out.

    Fast forward through cleaning up caps and necks...

    After the losing fight on the right wing, I thought, well lets see what we have on the left tank. So I took a can of 2yr old gas that I had drained out of it prior to annual, with the plug out, and a bucket under the drain hole, I began pouring the old gas in slowly.... nothing in bucket. A little more gas (hangar floor is not level). Still nothing. So I go to inspect the drain hole, and "THERE IS NO HOLE!"

    The only thing I can think is that the drain plug threads were attached to the tank, and the hole was never drilled?!?!?!?

    Does anyone have any insight?

  • #2
    Re: Wing Tank revelation, embarassment, mystery, and more

    On a related note, I was doing some research earlier on the forum, and came across talk of caps and seals. Marty had posted a source for caps and seals several years back. the caps didn't have the tabs or vents attached.

    I looked where he suggested, and it appears the seals are still available, but I don't see the caps offered any longer. Though the seals are reasonably priced, they want to charge $20 handling fee for any orders less than $50.

    It looked like Marty was working on making some caps, but I didn't see any update on whether he was successful.

    Any new sources for caps and seals?

    Comment


    • #3
      Re: Wing Tank revelation, embarassment, mystery, and more

      Originally posted by hisoos View Post
      On a related note, I was doing some research earlier on the forum, and came across talk of caps and seals. Marty had posted a source for caps and seals several years back. the caps didn't have the tabs or vents attached.

      I looked where he suggested, and it appears the seals are still available, but I don't see the caps offered any longer. Though the seals are reasonably priced, they want to charge $20 handling fee for any orders less than $50.

      It looked like Marty was working on making some caps, but I didn't see any update on whether he was successful.

      Any new sources for caps and seals?
      I would be happy to group buy a cap or two.

      Dale N22606

      Comment


      • #4
        Re: Wing Tank revelation, embarassment, mystery, and more

        The company that made the caps, the ones that were correct and original to our planes, stopped making those particular caps. I decided not to go forth due to most of the work having to be farmed out to people who could cut the tabs, as well as someone to braze the tabs and tubes. And, I did not want to take on the liability of producing aircraft parts.

        My suggestion is to try and find someone with originals that does not need them. They are out there, though may be difficult to find.
        Cheers,
        Marty


        TF #596
        1946 BC-12D N95258
        Former owner of:
        1946 BC-12D/N95275
        1943 L-2B/N3113S

        Comment


        • #5
          Re: Wing Tank revelation, embarassment, mystery, and more

          Thanks for the update Marty.

          Anyone have any thoughts on the drain holes that are not drain holes? Is it normal to have to drill the holes?

          Comment


          • #6
            Re: Wing Tank revelation, embarassment, mystery, and more

            Originally posted by hisoos View Post
            [Warning long wordy post]
            First of all hey Tribe, love you guys! Now where to start? After getting my bird back in the air after being grounded for around 5 years due to hail damage, a year of happy flying went by and it was time for annual again. Some life things happened which kept be from being proactive about it. When I got serious, the wonderful AI that helped me last had disappeared from the face of the planet. Couldn't find anyone who would either work on my 46 BC12D (at my home airport), or would do it for a reasonable price. Bought another plane in the meantime, but finally found a local old timer willing to help me out... eventually (on his schedule), but the price was right.

            Anyway I was in the middle of an owner assist working on tasks as assigned, when I hear him say "this wing tank cap needs a new seal". I said "OH! The wing tanks are in-op. Have been since I bought it. I am surprised you even got the cap off. I have always been afraid to force it."

            See when I bought the plane ~17 years ago, I was told the wing tanks were in-operable due to corrosion. I accepted it as evident by the rusty fuel caps, and have been running 12Gal main all these years.

            The old timer said the tank looks fine just seems that it may need the caps cleaned up or replaced, and the tanks flushed. We both took a look and sure enough the rust seen internally appeared to just be what had fallen in from the caps. He said he thinks the tanks are aluminum and he would use them if he were me.

            This afternoon for the first time since I have owned the plane, I decided to try to remove the 1/8NPT plugs. First one (Left) put up a fight, but I prevailed. The right one put up a bigger fight and I lost. It will need to be drilled out.

            Fast forward through cleaning up caps and necks...

            After the losing fight on the right wing, I thought, well lets see what we have on the left tank. So I took a can of 2yr old gas that I had drained out of it prior to annual, with the plug out, and a bucket under the drain hole, I began pouring the old gas in slowly.... nothing in bucket. A little more gas (hangar floor is not level). Still nothing. So I go to inspect the drain hole, and "THERE IS NO HOLE!"

            The only thing I can think is that the drain plug threads were attached to the tank, and the hole was never drilled?!?!?!?

            Does anyone have any insight?
            This makes no sense to me what am I missing?

            No hole in the left side and you just removed the drain plug? huh?

            Comment


            • #7
              Re: Wing Tank revelation, embarassment, mystery, and more

              Right. I removed the drain plug for the first time ever since I have owned it. I assumed there was an opening into the tank behind the plug, but I didn't confirm such assumption until after the lack of fuel coming out after I poured some in. After further inspection. No hole. Just metal. Poked at it a bit with a screw driver. Just metal.

              Comment


              • #8
                Re: Wing Tank revelation, embarassment, mystery, and more

                Are you sure its metal?

                Sometimes they get plugged up by debris and sloshing compound that creeps down there and it can be quite "sturdy"

                Comment


                • #9
                  Re: Wing Tank revelation, embarassment, mystery, and more

                  I can look in my filler with a flashlight/mirror or inspection camera (I forgot if bot work or only one) and see that hole from the inside maybe you can see it too?

                  Comment


                  • #10
                    Re: Wing Tank revelation, embarassment, mystery, and more

                    That is really weird!

                    I am hoping that it turns out not to be metal but you sound pretty sure of it being metal, are you able to scrape it and see shiny aluminum?

                    If so you can redrill with a bit big enough to allow a quick drain to work.

                    Very odd that it would have gotten by so many people for so long.

                    Dave R

                    Comment


                    • #11
                      Re: Wing Tank revelation, embarassment, mystery, and more

                      Doesn't really matter what's blocking the hole, you'll need to open it if the tank is going to be used. Siphon the gas out and and use a none electric tool to drill it through. There should be lots of material there to let you clean up the threads with a 1/8 NPT tap.

                      I had purchased one of these: https://www.aircraftspruce.com/catal...ickkey=3008203
                      it fits the neck perfectly and I removed the tab and installed a tube to emulate the original Tcraft vent. Then I found an original on Ebay so decided to go that route.
                      Scott
                      CF-CLR Blog: http://c-fclr.blogspot.ca/

                      Comment


                      • #12
                        Re: Wing Tank revelation, embarassment, mystery, and more

                        Originally posted by hisoos View Post
                        ....I looked where he suggested, and it appears the seals are still available, but I don't see the caps offered any longer. Though the seals are reasonably priced, they want to charge $20 handling fee for any orders less than $50....
                        I use T308-2 seals, available quite readily from t'interweb.

                        Rob

                        Comment


                        • #13
                          Re: Wing Tank revelation, embarassment, mystery, and more

                          Originally posted by Scott View Post
                          Doesn't really matter what's blocking the hole, you'll need to open it if the tank is going to be used. Siphon the gas out and and use a none electric tool to drill it through. There should be lots of material there to let you clean up the threads with a 1/8 NPT tap.

                          I had purchased one of these: https://www.aircraftspruce.com/catal...ickkey=3008203
                          it fits the neck perfectly and I removed the tab and installed a tube to emulate the original Tcraft vent. Then I found an original on Ebay so decided to go that route.
                          Hi Scott.

                          You are certainly correct.

                          It just seems so weird that a tank could be around for so many years with a manufacturing defect blocking the drain that I makes me terribly curious.

                          Dave R

                          Comment


                          • #14
                            Re: Wing Tank revelation, embarassment, mystery, and more

                            It was the end of the day when I made this discovery, and I needed to button some stuff up after making the discovery so I didn't do an exhaustive investigation. I currently believe that it is metal, but perhaps it is something else. Unfortunately, I probably won't be able to make it back out for further investigation for another day or two. Rest assured that I will keep everyone updated. Thanks for the replies.

                            So I am going to assume from everyone's responses that it is not a valid assumption that the tanks were installed, but the drain hole was never drilled. In other words that replacement tanks don't come like that. Rather that it is an anomaly.

                            I'm really kind of geeked about the idea that I may soon be doubling my fuel capacity, not looking forward to having to drill out the right wing plug though. That SOB was in there!
                            Last edited by hisoos; 03-13-2017, 16:16.

                            Comment


                            • #15
                              Re: Wing Tank revelation, embarassment, mystery, and more

                              Anything's possible. I wouldn't worry about why...I'd just drill it out and flush very thoroughly. Aren't the original tanks made of ternplate? I've seen some aftermarket stuff from a few of the "major" suppliers that really makes you wonder sometimes.
                              John
                              I'm so far behind, I think I'm ahead

                              Comment

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