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Thread: Sportomatic Adjustment Help Needed. I'm tearing my hair out!

  1. 03-03-2021, 09:47 PM #11
    taldora_2008
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    Hi Richard,

    You can see the "+" clearly on mine. On 72s this spade connects to a blue/yellow wire. The negative connects to 2 brown/white wires.

    Do you still have the black diode connected between the spades? This diode stops the shifter contacts from burning out.

    Name: sporto diode.jpg Views: 160 Size: 159.5 KB
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  2. 03-05-2021, 08:47 AM #12
    richardb
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    Hi all,
    Thanks for all your help to date.

    I've finally tracked down the problem. Both of the non-return valves in the inlet manifold are leaking and faulty. When I rebuilt the carbs the vacuum each inlet was making reduced vacuum and so this problem came to life.

    Next issue is finding replacements for the brass valves part # 905 116 725 00 as they are NLA.

    Thanks, Richard
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  3. 03-05-2021, 09:12 AM #13
    Bullethead
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    Sorry that's the issue after all, Richard... from everything you described those valves seemed the likely culprit. Still available but now about $200 bucks each. Ouch.

    http://www.autoatlanta.com/porsche-p...-69/107-35.php
    Russ

    ESR # 1537

    '62 356S Notchback Hotrod
    '67 S Das Geburtstagsgeschenk
    '68 T Targa Sportomatic
    '68 L SW Targa Sportomatic
    '70 914/6 GT
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  4. 03-06-2021, 02:52 PM #14
    taldora_2008
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    Sorry that I didn't look this up earlier. I used an ebay aircon recharge gauge. (I was running my spare 2.7 in the car at the time.)

    Name: sporto vac pressur.jpg Views: 179 Size: 131.9 KB
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  5. 03-06-2021, 11:37 PM #15
    DarthMJH
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    It’s available here as well. http://www.einmaligparts.com/Check-Valve1_p_84042.html

    Are these not repairable, is the valve just sticky? Maybe some releasing fluid will free it.
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