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Yet another unattached tube . . . to the distributor this time.

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  • Yet another unattached tube . . . to the distributor this time.

    I have a Lucas 22D distributor in me new-to-me '76 TR6. In repairing a fuel-line leak it came with, and checking other things, I traced the vacuum line from the distributor advance/retard diaphragm housing to . . . nothing. It ends open to the air. Any advice on where (and if) it needs to be connected? Or just plugged? I'm heading to check the book to see if this is a vacuum-retard unit.

    Thanks!

  • #2
    If it's the vacuum retard module it's nipple will point in the general direction of the cockpit.
    Where it the other end of the hose connects to is going to depend upon what carbs you have and if ZS what year version they are.
    Driving a 1973 TR6
    Doing ZS carb repairs
    email kencorsaw"at"aol.com

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    • #3
      Thank you Ken . . . it is a retard unit then. I do have ZS carbs; I presume they are contemporary with the car. Will it do any harm to simply plug the line for now? I don't think I want the vacuum retard working anyway from what little I know so far. This engine has raised compression, a street cam, and roller rockers, among other modifications.

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      • #4
        If you are not going to use the vacuum retard, you need to see if the vacuum source nipple has been TIGHTLY sealed off or not.
        The vacuum recipient nipple on the module is just a hole..you can cap it for looks or not...
        If the carbs are the versions that the car came with you'll find the vacuum source's nipple on the bottom of the front carb.
        Here's a picture with a red straw as an indicator
        Driving a 1973 TR6
        Doing ZS carb repairs
        email kencorsaw"at"aol.com

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        • #5
          It was not sealed off, thank you! It is now. What about the vacuum advance conversion from Moss etc.? Worth it given the other work on the engine? I hate to think of the distributor putting the brakes on everything else by holding back on the timing advance.

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          • #6
            If you do decide to replace the retard module with the British Vacuum Unit vacuum advance module that Moss and others retail, I'd suggest buying it directly from BVU and sending the distributor to them for Robert Medynskit(Rob) to install and check the current mechanical advance curve and reset it if necessary.
            The module itself is rather fragile and they are less likely to crack it like an eggshell than you during installation.
            Despite some claims, I have not noticed any significant performance enhancement and I've had mine for several years...It's claimed that the advance it provides kicks in when you are cruising along steadily which may provide better gas mileage when you are driving under those conditions...maybe if prolonged enough to make a difference....
            Here's a link to BVU...despite what I said about the Vacuum Advance conversion Rob is a good guy and will fix you up very quickly...
            https://www.britishvacuumunit.com/services.html
            Driving a 1973 TR6
            Doing ZS carb repairs
            email kencorsaw"at"aol.com

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            • #7
              Thanks for that, and for the link, Ken.

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              Yet another unattached tube . . . to the distributor this time.

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