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    Gearbox tunnel insulation

    Hey guys,
    There have been a few comments recently about whether all Stags had a moulded insulation under the gearbox tunnel.
    Whilst the gearbox is out from my red mk1, I've decided to clean up the tunnel and have taken it out. It's the first time I've seen one properly, apart from the drawings in catalogues.

    DSCF9719 (768x1024).jpgDSCF9720 (768x1024).jpgDSCF9721 (1024x768).jpgDSCF9722 (768x1024).jpgDSCF9724 (1024x768).jpg

    It should be held in by 4 bent metal clips. One was missing, two others were hardly catching due to damage and it was really only a cable and pipe holding up one side.
    It was suggested leaving it off for access to bell housing bolts. I can see, having taken it off that someone previously has already trimmed off the front part.
    In another thread, it was suggested leaving it off to prevent rust forming underneath. I have to say apart from a load of dust and surface rust, it is one of the better preserved parts of this 1972 car.
    The question was raised if Triumph fitted these to all Stags. I've taken advantage of the lack of rain today to climb under my white 71 and carmine 77 that live outside and note that the 77 doesn't have one. This is a one owner low mileage and I doubt if gearbox has ever been removed. I can't even see the fitting clips so I'm guessing that the insulation wasn't fitted to the later Stags.
    This idea suits me fine because they're unavailable. I plan to use some metallic stick on insulation, instead. This should be thinner and I'm hoping the reflective surface will aid any future checks in this hard to see area.
    Cheers Johny

    #2
    That's interesting. Thanks for taking the time to take the pics and post Johny

    Cheers

    Julian

    Comment


      #3
      I was wondering this myself a few months ago. I came to the conclusion that Mk1 cars had the insulation under the tunnel, and Mk2 cars inside the car between the tunnel and carpet. The original parts book also backs this up.

      My car is an early Mk2, and although it had no under tunnel insulation, it still had the metal clips - unused. Glued to the carpet was a horsehair type pad. I actually sourced a usable Mk1 under-tunnel pad and fitted that along with new carpet underfelt with the new carpet. I wonder if I'll actually hear the engine now? I wonder how easy it will be to get to the bell housing bolts!

      Cheers,
      Mike.
      Mine since 1987. Finished a 20+ year rebuild in 2012. One of many Triumphs and a 1949 LandRover!

      Comment


        #4
        I am not convinced these insulation pads are worth the bother. A friend of mine has no under boonet pad, and has a louvred bonnet. The engine seems just as quiet as any other stag I have driven.

        Comment


          #5
          Originally posted by V Mad View Post
          A friend of mine has no under boonet pad, and has a louvred bonnet. The engine seems just as quiet as any other stag I have driven.
          And possibly cooler ?

          Cheers

          Julian

          Comment


            #6
            Johnny.
            Yes the front of yours has been cut off, the original is a pain as it just keeps pushing the socket off the head of the bolt and you can get your fingers in there to keep it in place.
            I replaced mine with the stick on foil faced sound proofing and made sure the edges are sealed with the aluminium (double glazing supplies) tape to keep the water out of the edges. (http://www.powerfuluk.com/categoryli...absorbing-mat/) The best bit was that the amount of light it reflected around made so much nicer to work on. Did it need the sound proofing ... not sure but it would be a real PitA to fit afterwards.
            I also managed to get some very heavy duty sound proofing material after we had to do an experiment at work on making some computer equipment racks quieter for use in offices (the noise kept them awake). It worked but the cabinets overheated so it was all then taken out and thrown away so I manage to get hold of some I fitted that under the carpets and the car is just so quiet. Now its just the rumble of the exhaust, the dam squeak from the drivers sun visor and one relay loud annoying squeak coming from the rear seat area or possibly the hood frame have not been able to trace it yet its not there all the time and seems vibration sensitive not road related.

            Paul.

            Comment


              #7
              Originally posted by Mike Stevens View Post
              I was wondering this myself a few months ago. I came to the conclusion that Mk1 cars had the insulation under the tunnel, and Mk2 cars inside the car between the tunnel and carpet. The original parts book also backs this up.

              My car is an early Mk2, and although it had no under tunnel insulation, it still had the metal clips - unused. Glued to the carpet was a horsehair type pad. I actually sourced a usable Mk1 under-tunnel pad and fitted that along with new carpet underfelt with the new carpet. I wonder if I'll actually hear the engine now? I wonder how easy it will be to get to the bell housing bolts!

              Cheers,
              Mike.

              can confirm that my 72 mk 1 has the tunnel insulation and wool carpets with built in underlay from aldridge as original spec

              think the insulation goes a long way to stop heat transfer into the car ,and also as a soundproof barrier

              alan

              Comment


                #8
                I'm pretty sure that the Bulkhead insulation is there for thermal insulation not sound insulation. From running my engine/ gearbox on a test bed I can confrim that the bell housing and gearbox casing get quite hot just through conduction. Sound insulation only works if there are no holes in it and the under tunnel pad has lots of them.
                My 72 Mk 1 has the insulation below the tunnel.
                Nick
                Nick
                72 Federal Stag. TV8, RHD & MOD Conversions.

                Comment

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