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Tube fittings for radiator plug hole

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    Tube fittings for radiator plug hole

    Can anyone supply details of tube fittings that fit the radiator plug hole?

    I want to create an elbow ending in a stub pipe to take the hose to the overflow bottle.

    Many years ago, another engineer pointed out that the existing overflow pipe (which starts some distance down into the bottom hose header) will not allow any gas to escape into the overflow, but will force water out. (For example, air introduced by a small leak, or combustion gas from a slight head gasket blow). I had a spare radiator re-cored and modified to have a stub pipe braised into the neck near the top hose connection, and I have used it for many years.

    A few years later, I had a chance to test this, as I had a slight head gasket blow. Before I stripped the engine, I carried out the following test with a standard radiator, and my modified one.
    Run engine till thoroughly warmed up; Stop.
    Fill overflow bottle and radiator.
    Run engine at 2000rpm for 30 minutes
    Stop and allow to cool completely
    Measure how much water is required to refill just the radiator
    Standard radiator required 480ml; modified radiator required 70ml.
    So this proves that connecting the overflow to the top of the radiator, by the top hose, allows gases to escape to the overflow bottle, whereas the standard arrangement drives out a larger quantity of coolant.

    My modified radiator has now developed a leak, so I have temporarily refitted my standard one. As I don't have access to anyone who could quickly make the modification, I thought I could achieve the same by replacing the plug with an adaptor - hence the question above.
    '72 Manual O/d Saffron Yellow

    #2
    http://www.ldpart.co.uk/shop/shop.ph...c21424c443e701
    I only do what the voices in my wife’s head tell me to do!

    Comment


      #3
      Ah, thanks very much; that is a good start. Now all i need is something to reduce that to a 5/16" or 8mm stub pipe.
      Last edited by davidf; 6th August 2019, 19:04.
      '72 Manual O/d Saffron Yellow

      Comment


        #4
        David,

        1/2bsp

        Buy a 1/2 bsp elbow - ebay or any plumbers merchant such as
        https://www.ebay.co.uk/itm/UK-BSP-BR...pGo_CqqpVwkESg


        This gives you a 1/2bsp male end to attach to, then buy a 1/2bsp female to 8mm . such as

        https://www.ebay.co.uk/itm/British-M...AAAOSwNeVbdslf

        BSP is a wonderful standard for hoses for radiators you can make your own T's and reducers at very low cost to most sizes of hose.

        Alan

        Comment


          #5
          1/2" bsp elbow from b and q with a 15mm Male to 8mm copper reducing fitting.
          all done in 2 bits cost about 3 pounds
          other suppliers are available...to keep things correct

          Comment


            #6
            When modifying my radiator for a header tank I shortened the vent ex the top of r/hand tank so it is flush with the top of the tank, not dipping in. The other end I soldered into the filling stub just below the plug thread. I then threaded a 45 degree hose fitting into the opposite side at the same height and this feeds the top of the header tank mounted on the L/hand strut tower. The idea being to vent air/gas from both radiator tanks to the top of the header tank.
            Cheers Ian A

            Comment


              #7
              I see the dreaded HT is creeping in under disguise …
              Mabel is a white 1972 Mk1½, TV8, ZF 4HP-22 auto,
              2016 RBRR finisher. 400 mile C2C 21/22 April 2018!

              Comment


                #8
                Originally posted by mole42 View Post
                I see the dreaded HT is creeping in under disguise …
                "All i said was this bit of halibut was good enough for J******"
                "Stone him"
                Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

                Comment


                  #9
                  Mabel is a white 1972 Mk1½, TV8, ZF 4HP-22 auto,
                  2016 RBRR finisher. 400 mile C2C 21/22 April 2018!

                  Comment


                    #10
                    The best thing that can be done to a Stag is a Header tank with a low level alarm.
                    Cheers Ian A

                    Comment


                      #11
                      Hi David, is this what you are after

                      P1050305.JPG
                      "The UK,s Most Easterly Stag" Quad Exhaust- ZF 4 Speed BOX

                      Comment


                        #12
                        Thanks to all for your suggestions. I didn't follow them precisely, but you all set in train a search which led to this

                        https://www.advancedfluidsolutions.c...ing-3864-p.asp


                        ScreenHunter_179 Aug. 11 23.40.jpg
                        Attached Files
                        Last edited by davidf; 12th August 2019, 00:49.
                        '72 Manual O/d Saffron Yellow

                        Comment


                          #13
                          Originally posted by davidf View Post
                          Thanks to all for your suggestions. I didn't follow them precisely, but you all set in train a search which led to this

                          https://www.advancedfluidsolutions.c...ing-3864-p.asp


                          ScreenHunter_179 Aug. 11 23.40.jpg
                          Nice solution BUT it is made of Nylon 66 and with a hot engine with 33% anti freeze and a pressure cap at 20 psi the coolant will boil at around 135 deg C - which is way above the quoted 110 deg C max for this part. I know normally the coolant will be running around 90 deg C, but it doesn't take a lot for the temperature and pressure to rise (the max pressure for this part may be 200 psi but that is at only 20 deg C). Personally I would stick with copper/brass fittings - I have used this company before (Wrekin Pneumatics) and they were quite helpful. Here is a link to one of the auction site listings:

                          https://www.ebay.co.uk/itm/BSP-TAPER...kyzgZHyMf7f41w

                          Roger
                          White TV8 BW35 no mods and now a Dolly Sprint to keep it company
                          So many cars, so little time!

                          Comment


                            #14
                            I agree with Roger above a nylon fitting is just too close to its melting point Stick with brass, here is a brass elbow.
                            https://www.ebay.co.uk/itm/1-2-BSP-t...0AAOSweuxWRcR0

                            Not much difference in the price.

                            Alan

                            Comment


                              #15
                              Originally posted by barkerwilliams View Post
                              I agree with Roger above a nylon fitting is just too close to its melting point Stick with brass, here is a brass elbow.
                              https://www.ebay.co.uk/itm/1-2-BSP-t...0AAOSweuxWRcR0

                              Not much difference in the price.

                              Alan
                              Many thanks for that link - my previous searches didn't find that one. It is working Ok with the nylon one, but I do agree that it is close to the limit. For the sake of £3.80, I have ordered the brass one to replace it.

                              Cheers
                              '72 Manual O/d Saffron Yellow

                              Comment

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