Tachometer goes only up to 2500

  • Hello all,


    I have previously brought my 911 out of hibernation.


    Unfortunately, he woke up with a violent backfire. After I fumbled the rubber ring back into the popoff valve, then deliver nicely.


    However, the dzm never shows more than 2500 revs.

    And when I turn the 911 off, the dzm doesn't go back to zero.


    Does anyone know this?

    Can you fix it yourself or do you have to send it in where?

    If so who can fix it?


    Thanks and many greetings

    Jürgen

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  • Hello,


    does the effect occur for the first time since starting from hibernation or was it before?


    "However, the dzm never shows more than 2500 rpm.

    And when I turn the 911 off, the dzm never goes back to zero."


    "Never more than" sounds interesting.... From this I read that the DZM ALWAYS shows fixed at 2,500, whether engine on or off (?).


    Sure you can fix it yourself, but only if you have sound mechanical and electronic knowledge (tools, gauges, etc.).


    Otherwise, the engineering office Gerberding is usually a good contact for such problems.

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    Beste Grüße, Wolfgang

    71 2,2S · 911.02 · 915.02

    73 2,4TE · 911.51 · 915.02

    83 3,0SC · 930.16 · 915.63

  • Hello,


    than when the 911 is off, the dzm goes down to just under 0, but not zero.

    When I drive, the Dzm goes to max 2500, although the engine is far more due to speed, gear and noise.

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  • Hello,
    inside the tachometer is a small electro-mechanical measuring mechanism. This is very delicate and sensitive to dirt or gumming. If you don't know what to do there, better give it to a specialist.
    The ring that holds the glass must be flared,
    the wires have to be unsoldered for overhaul,
    the pointer must be removed...


    This is about the speedometer of a 993, but the procedure is similar....


    One mistake and you have to buy an expensive used replacement part. Send the tachometer to the above address and be happy about a working tachometer...


    Greetings Stefan

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    alte Porsches:
    911S Ex US '76 mit Umbau auf 3,2l 207PS (Motor 930/21 mit Getriebe 915/68) - Silbermetallic, Schiebedach

    911SC Targa Ex US '81 3,0l 179PS (Motor 930/16 mit Getriebe 915/63) - Weinrotmetallic

    944/1 Targa '84 2,5l 163PS - Platinmetallic (bis 03/2017)

  • Drive a few km, then that probably goes away.

    Know this from my speedometer - after prolonged standstill sticks it all a little...

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  • Hello,


    thanks for the tips. Will watch this and send in the dzm if necessary.

    I will report...


    Thanks and many greetings

    Jürgen

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  • Hello,


    short update: the dzm works again.

    During the last ride knocked two three times on the Drzm, and lo and behold, the needle moves normally again.


    Was probably just stuck over winter.


    Send in is fortunately no longer necessary.


    Thanks and many greetings

    Jürgen

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