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Rebuilding Strombergs

Discussion in '"Stock" Alpine' started by Green67Alpine, Jan 4, 2007.

  1. Green67Alpine

    Green67Alpine Former SAOCA Membership Director Gold Level Sponsor

    Happy New Year to all ! GREAT new look to the web site.
    I've received the "pair" rebuild kit from SS and will start to rebuild these carbs in the very near future. Any advice except do one at a time. Hints, tips , watch out fors, becareful ofs ? I'll gladly accept all advice and direction on redoing these babies. :confused:
    Thanks, Tom J

    Ever Challenging Series V
     
  2. Nickodell

    Nickodell Donation Time

    About the only thing you can really do wrong is bend the needle or neglect to center the jet. That and not synchronize them.
     
  3. ozzie alpine

    ozzie alpine Bronze Level Sponsor

    Hi Tom,
    Make sure the throttle spindles (ie through the butterflies) are not worn, as this will be an ongoing air leak to the system. The spindles themselves can be replaced, but the bushes could be worn too, and therefore require specialist replacement/sleeving.

    Apply a little loctite to the 2 screws holding the butterflies to the spindle if you are removing/replacing them.

    Fit a new o-ring to the jet adjuster (assuming bottom-adjusting type?).

    Make sure you very carefully set the float level as per workshop manuals. Its much easier to do it on the bench when the carbs are upside down!

    I found that the float chamber screws were very hard to undo on an old pair that I rebuilt last year, and I ended up snapping one and having to drill/re-thread. Be patient and soak them in pentrating fluid for a couple of days first if they are tight.

    Good luck!
     
  4. Wombat

    Wombat Donation Time

    I had a pair done for for my Hillman Hunter GT years ago. The throttle shafts and bushes were worn. The carb shop bored out the bushes and put new teflon? bushes in together with new shafts. Specialised machining job though, the throttle shaft needs to be exactly in the centre of the carb throat. Everything else is straight forward though. Might be worth loosening the jet retaining screw before you take the carbs off the car. These can be tight.
     
  5. sunbeam74

    sunbeam74 Silver Level Sponsor

    To do the final setup on the jets and throttle plates you might want to
    use a dial or digital caliper - even the cheapies would work.

    1) Jets - With the Dashpot top off and air valve piston out, looking down on the jet, measure the depth that the jet sits in the housing. Do the other side and adjust it to make it match the previous side exactly. Use the jet mixture bolt on the bottom of the carb to make this adjustment.

    2) Throttle plates - with the caliper measure the edge of the throttle plate to the mounting face of the carb. Adjust the slow running screw so each side is equal.

    Now, your carbs should be in near perfect sync regarding mixture and flow.
    Don't adjust one side without adjusting the other side an equal amount.
    Otherwise you've just thrown your balance out the window. If you do this you won't have to use a uni-sync or even listen to your carbs for equal air flow.

    Once installed on the car fire it up and lift the dash pot on one side slightly. Listen for the rpm change. If too rich or lean adjust both side EQUALLY. Adjust the idle speed with the slow running screw BUT adjust each side EQUALLY.



    Steve
     

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