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Thread: Mechanical advance not working.

  1. #1

    Default Mechanical advance not working.

    The mechanical advance on my distributor is acting up. It will only advance 10° no matter which stop ring I use. I've checked the slot and it contacts both ways, weights are free, advance mechanism moves freely. I've tried a few times to get it working, but I'm at a loss. Engine runs good, starts right up. Any suggestions? 521 BB Ford. 6AL box.

  2. #2
    Join Date
    Jan 2010
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    What speed does the engine idle at? Perhaps the advance has already started? Or are the weights hitting inside of the rotor, instead of the slot? Gary
    Regards, Gary

  3. #3

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    It's idling at 900 RPM. I'll give the rotor a close inspection today, thanks for the tip!

  4. #4

    Default

    And what's the part number on this distributor?
    shake-n-bake

  5. #5

    Default

    It's an 8580. I looked close at the weights and they have worn areas on the edges that allow the them to lift and go beyond the stop. I think they may be lifting and contacting the rotor. I ordered a new set of weights and rotor. Any input greatly appreciated. Thanks..

  6. #6
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    What color bushing have you got in their now?
    Many guys would kill for only 10 degrees.
    Can you post a photo of what's going on here? Gary
    Regards, Gary

  7. #7

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    Currently a green, but it was the same with a silver, base timing is at 14°.

  8. #8
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    What springs? How about some photos of this "worn areas on the edges that allow the them to lift and go beyond the stop"? Gary
    Regards, Gary

  9. #9

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    Light blue & light silver. Put in new weights & rotor, no help, still only 10°. I don't have access to a camera, sorry. Ordered new pickup, to see if that helps.

  10. #10
    Join Date
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    Changing your pickup won't change anything. I think you may have the trigger wiring backwards: https://forums.holley.com/showthread...ickup-polarity. While the rotor is fitted, will the weights move out by hand and drive the shaft around so the stop bush hits the slot limit? You might need to do this with the unit out of the car. Gary
    Regards, Gary

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