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    Coolant header tank

    While having owned a stag for years, Im a newish member & wanted to "put something back"; given the
    wealth of info on this site.

    Last year having started the motor & mins later noticed there was no water in the top return radiator hose, I
    decided I wanted a better solution to the expansion bottle. I know a number of guys have put in header tanks and
    this is was I wanted, reasons:
    - to have something visual & reliable
    - something where the "input" was higher than the pump/heads
    - pref something electronic to siganl low coolant

    Pic, speaks a thousand words; hence inclusion that shows the jobby.

    Volve ebay header tank, with electronic low coolant. Input to pump, by T-ing off the existing
    heater outlet (this should draw water from the header). Air return from the top radiator into the
    header tank. I know a number of guys have the input into the radiator; I didnt want to go this route
    since i didnt want to frig with the radiator (only to have to do it again if I change the rad).

    It works a treat and appears to run cooler than before. Was a straight forward job, the header
    bracket was the most hassle. Yet to wire in the low coolant, but will use a relay (as closed circuit
    on OK) and prob use the "seat belt" wanring light.

    In addition I have been overhauls the brakes for the MOT. All easy, apart from the handbrake
    adjustment. Thank god for this site in helping. In the end I went a different approach, rather than
    loosening the cable for adjustment, I took off the drum & gently pushed the foot brake to get a single
    clip on the adjuster. Tried the drum, repeated until the drum was a "good fit". Handbrake is now the
    bollox.

    The only qurestion I ask myself, is why am I in the garage in this sub zero temps?
    Attached Files

    #2
    Originally posted by nigelsch View Post
    While having owned a stag for years, Im a newish member & wanted to "put something back"; given the
    wealth of info on this site.

    Last year having started the motor & mins later noticed there was no water in the top return radiator hose, I
    decided I wanted a better solution to the expansion bottle. I know a number of guys have put in header tanks and
    this is was I wanted, reasons:
    - to have something visual & reliable
    - something where the "input" was higher than the pump/heads
    - pref something electronic to siganl low coolant

    Pic, speaks a thousand words; hence inclusion that shows the jobby.

    Volve ebay header tank, with electronic low coolant. Input to pump, by T-ing off the existing
    heater outlet (this should draw water from the header). Air return from the top radiator into the
    header tank. I know a number of guys have the input into the radiator; I didnt want to go this route
    since i didnt want to frig with the radiator (only to have to do it again if I change the rad).

    It works a treat and appears to run cooler than before. Was a straight forward job, the header
    bracket was the most hassle. Yet to wire in the low coolant, but will use a relay (as closed circuit
    on OK) and prob use the "seat belt" wanring light.

    In addition I have been overhauls the brakes for the MOT. All easy, apart from the handbrake
    adjustment. Thank god for this site in helping. In the end I went a different approach, rather than
    loosening the cable for adjustment, I took off the drum & gently pushed the foot brake to get a single
    clip on the adjuster. Tried the drum, repeated until the drum was a "good fit". Handbrake is now the
    bollox.

    The only qurestion I ask myself, is why am I in the garage in this sub zero temps?







    'Cos you're a Stag owner, and most of us are as mad as hatters ! Thanks for the post ! Martin.

    Comment


      #3
      Do you leave connections to the expansion tank in place or is the expansion tank now not required? If the latter, what did you have to do with the connections to it?

      Cheers

      Comment


        #4
        Nigel,

        Similar set up to my own.

        DannyP6030039.JPG
        Attached Files
        Last edited by Danny; 8 April 2012, 21:11.
        Danny 1972 STAG Mk1 TV8 Auto, 1967 SPITFIRE http://www.grampianstags.net
        sigpic

        Comment


          #5
          Hi Danny

          I see you have retained the hose from the offside top of the rad which originally would have gone to the overflow bottle. I see the original overflow bottle is still in situ. So is the hose still connected to it? I can't tell from your photos. If it is, why have you retained that set up as well as having the new header tank?

          Regards

          Bruce

          Comment


            #6
            Bruce,

            The Expansion bottle is no longer part of the system, the hose is still there but has a blanking plug in it.

            Here is more info http://www.grampianstags.net/headertank.htm

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

            Comment


              #7
              Originally posted by Isis View Post
              Do you leave connections to the expansion tank in place or is the expansion tank now not required? If the latter, what did you have to do with the connections to it?

              Cheers
              Pete,

              In my case I removed the expansion tank and blanked off the pipe with a short length of rubber hose and a bolt. The Volvo header tank (c/w level switch) feeds a boss fitted into the radiator side tank, with the return tee-ed into the top hose with plumbing fittings.

              It's not as well engineered as the Stagweber kit, but it works for me. The engine remains cool in all conditions so far encountered.

              The tank will lift off its mounting bracket without tools to get clear access to plugs, etc.

              Dave
              Attached Files
              Dave
              1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

              Comment


                #8
                Danny

                On your second photo I can see a couple of top-up bottles (brake fluid, coolant?) where the original overflow bottle is located.

                Is that where you store them?

                I only ask because I'm off to Classic Le Mans in three months and already I'm thinking about where to store things.

                Regards

                Peter
                Bereft of a Triumph of any description.

                Comment


                  #9
                  I'd spotted that. What a brilliant idea

                  I was wondering what I could do with that space, now I've installed a remote header tank. I think I might even re-use my old expansion bottle to store....... wait for it....... coolant !!

                  Cheers and thanks Danny.

                  Julian

                  Comment


                    #10
                    Peter/Julian,

                    Yes I use the space the expansion bottle used for carrying ready mixed coolant and engine oil (tha'ts what I tell everyone). It is really my emergency supply of Vodka in the aluminium bottle!

                    P4090018 1.JPG
                    Attached Files
                    Danny 1972 STAG Mk1 TV8 Auto, 1967 SPITFIRE http://www.grampianstags.net
                    sigpic

                    Comment


                      #11
                      I am interested in this mod also, mostly because I have AC and can not fit the kit that most people is using. Also, I think the alu tank is a little out of flace in a standard engine bay. If somebody put together a kit with a new Volvo tank, the correct (maybe modified ?) bracket plus all needed I would buy it instantly!

                      Can anyone take a picture of the part number on the Volvo tank? I am thinking of going to a dealer and get a new tank (if the price is not crazy...)
                      Kirsti & Ian in Norway
                      1973 Stag Mk2 (ex-USA), Mallard Blue, TV8 engine, Manual O/D

                      Comment


                        #12
                        Thanks guys for all the information. I think I'm going to try the method used by the Grampian Stag guys. I might see if I can stick the probe for the Kenlowe fan up the pipe that needs to be blanked off. Where a PO had put it (in the top hose) it caused a leak rendering the expansion bottle useless. I'd really like to fit an electric pump too and get rid of the original. I'm paranoid about a jack shaft failure. The Davies Craig pumps are really expensive though.

                        Comment


                          #13
                          Originally posted by Ian928 View Post
                          I am interested in this mod also, mostly because I have AC and can not fit the kit that most people is using. Also, I think the alu tank is a little out of flace in a standard engine bay. If somebody put together a kit with a new Volvo tank, the correct (maybe modified ?) bracket plus all needed I would buy it instantly!

                          Can anyone take a picture of the part number on the Volvo tank? I am thinking of going to a dealer and get a new tank (if the price is not crazy...)
                          Hi Ian,

                          I am unable to get details of the part number at present as I am away from home until the end of next week. The tank came from, ISTR, a 700 series of mid '90s vintage I found in a scrap yard. New ones aren't too expensive. The bracket I cut from the inner wing of the donor car and welded a length of steel to it for mounting on the suspension turret:

                          DSC00385.jpg

                          These two close up photos were taken during the trial fit to my first Stag in Sept 2007 (and before I cleaned the tank properly!). The fitment was published in the SOC magazine shortly after.

                          DSC00383.JPGDSC00382.JPG

                          Dave
                          Dave
                          1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

                          Comment


                            #14
                            Hmm, I fascinated to see the variances between the pipework on Dave's and Danny's two systems. On Dave's the main feed goes into the rad half way down where as on Danny's it goes to the the pump housing. Does one system have an advantage over the other?

                            I love the idea of the quick release bracket on Dave's. I have purchased a Merc tank as used by Danny and have made a bracket to support it and am now on the look out for a suitable hose to fit to the tank output.

                            Regards

                            Bruce

                            Comment


                              #15
                              Another question for DJT and Danny. Why did neither of you use the already existing overflow pipework off the rad to form the return to the header tank? Both of you have gone to the trouble of forming a new connection and blanking off the old pipe and I am wondering why?

                              Cheers

                              Bruce

                              Comment

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