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    Header Tank Fitted.

    Having fitted a Stagweber header tank at the weekend to my MkII manual, thought I would post my experience/thoughts on the procedure which may be of use to others considering the same. No connections with the supplier.
    Apart from a few alterations, my car is virtually original and I wish to keep it that way so I pondered long and hard before purchasing the header tank. I have had no overheating issues in the year that I have owned the car, in fact, the temp gauge has never got much further than half way to vertical. Without going over old ground which has been well and truly trodden in many a post here, my reason for fitting a header tank is simple. I would like to know if coolant is being lost BEFORE the temperature gauge goes up! Also, reverting to the original set up is straightforward.

    I decided to take the opportunity to change the coolant so set about removing the bottom hose. I loosened the clamp holding the metal pipe and the upper connection as suggested on a post here but it still took me half an hour to get it off! Coolant was nice and clean which was good to see.

    When fitting the tank to the top strut I suggest bending the lower bracket fully out of the way first and spend time getting the tank alignment correct before tackling the lower bracket fixing.

    The trickiest job I found was the connection of the tee piece into the heater hose U bend. If you have a Weber carb fitted then you don't have to worry about the air intake connection. The heater hose was pushed too far onto the metal pipe and this affected the position of the tee piece which in turn affected the position of the pipe running from the tank to the tee piece. Pull the heater hose off the pipe too far and the tee piece then fouled with the rubber air intake connector. Cutting the pipe correctly to accept the tee piece was not easy. I have ended up with the new pipe from the tank touching the engine lifting eye which I am not sure is ideal? Two pieces of pre-cut heater hose would have made the job a lot easier. I may revisit this next time I change the coolant.

    Wiring up the buzzer connection from the float switch was straightforward however the wire pulled easily out of the female spade connector (twice) so I ended up making this a permanent connection. The earth wire is also a tad shorter than I would like for connecting to the windscreen wiper earth as suggested in the instructions.

    Refilling was a doddle and I have had no leaks or issues following a 30 mile test run. All in all a very satisfying job. Apart from my minor niggles above the kit is very comprehensive, well engineered, well made and has easy to follow instructions. Top job!

    Job took 4 1/2 hours to complete including removing the bottom hose and spending far too much time cleaning the inner wing area before fitting the tank!

    Next on the list will be dual temp/oil pressure gauge to put the last of my paranoia to bed. (braided pipe from Demon Tweeks on order by the way in case anyone else gets paranoid on my behalf!)
    Last edited by Graham Pops; 26 May 2015, 20:32. Reason: spelling!

    #2
    Hi Graham,

    How about a photo of your set up - I love these header tank threads.

    Danny
    Danny 1972 STAG Mk1 TV8 Auto, 1967 SPITFIRE http://www.grampianstags.net
    sigpic

    Comment


      #3
      I agree with Graham. A well engineered kit, which is straight forward to fit. I've done around 500 miles since the engine rebuild with this kit fitted with no issues.

      Simon

      Comment


        #4
        I knew someone would want a photo but the car us kept 50m from where I live (don't ask!). I will take some snaps at the weekend and post.

        Comment


          #5
          50 metres is not far😜

          Comment


            #6
            Did someone mention header tanks?



            Thought I'd get in first with this........
            Dave
            1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

            Comment


              #7
              Tanks for that!

              Comment


                #8
                Originally posted by DJT View Post
                Did someone mention header tanks?



                Thought I'd get in first with this........

                You'll upset Jeff, that's his job
                Wise men ignore the advice of fools, but fools ignore the advice of wise men sigpic

                Comment


                  #9
                  I have a Volvo header tank. I was running with a 20Psi (1.4 Bar) rad cap and once warm the level in the header tank rose maybe 3/8" (9mm). As the engine runs cool I didn't see the need to run at 20Psi so I bought a 13 Psi (0.9 Bar) cap. I tried it on the weekend and once warm the expansion tank was nearly full at least 3/4" (19mm) higher than before. I don't understand why, anyone got an ideas?
                  The operating pressure only affects the coolant boiling point, I don't see how it can affect the volume in the system. I guess I can run my infrared thermometer over the engine to see if operating temperatures have changed. More I think of it they must have - no idea why - maybe I should have left well alone.
                  Nick
                  Nick
                  72 Federal Stag. TV8, RHD & MOD Conversions.

                  Comment


                    #10
                    Water does expand when heated. It would freely expand if there was no cap but in this case you do have a cap with a pressure relief which restrains the volume expansion in proportion to the pressure. SO with the 20lb cap the system once heated is running at 20lb which restrains the volume expansion more than the same system running at 13lb. Hope it makes some sense?
                    Last edited by Hughesy; 27 May 2015, 07:31.

                    Comment


                      #11
                      Yes, that makes sense, so it's like a big bird in a rubber suit. Thin rubber stretches but thick keeps everything contained.

                      Comment


                        #12
                        Originally posted by Westfaling View Post
                        I have a Volvo header tank. I was running with a 20Psi (1.4 Bar) rad cap and once warm the level in the header tank rose maybe 3/8" (9mm). As the engine runs cool I didn't see the need to run at 20Psi so I bought a 13 Psi (0.9 Bar) cap. I tried it on the weekend and once warm the expansion tank was nearly full at least 3/4" (19mm) higher than before. I don't understand why, anyone got an ideas?
                        The operating pressure only affects the coolant boiling point, I don't see how it can affect the volume in the system. I guess I can run my infrared thermometer over the engine to see if operating temperatures have changed. More I think of it they must have - no idea why - maybe I should have left well alone.
                        Nick
                        Hi Nick,

                        I recently posted a list of alternative part numbers for different pressure rated Volvo tank caps. I ordered a 0.9kpa (13psi) cap through a motor factors but a 1.4kpa (21psi) one was delivered. It seems this is the standard Volvo pressure now. Whilst changing the water pump on my son-in-law's Rover 420 recently I noted that the header tank cap on that was 0.9kpa and it fitted the Volvo header tank perfectly. On the basis that the Volvo cap has been working fine on my Stags for 10 years I decided not to bother to try it.......
                        Dave
                        1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

                        Comment


                          #13
                          Thanks Graham - as it happens, I have the stagweber header tank kit sat in my garage waiting to be installed (hopefully this weekend)! It is very useful to have your thoughts and I hope the install will go as smoothly as yours...

                          Comment


                            #14
                            which volvo header is it guys?

                            Comment


                              #15
                              Bit late ain't I?

                              been driving through Espania all day.
                              I only do what the voices in my wife’s head tell me to do!

                              Comment

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