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Thread: motor question

  1. #1
    Join Date
    Dec 2007
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    643

    Default motor question

    just got my motor back put timing light on mark is jumping around so much can't get a true timing i have a 2 piece cloyes timing cover on it and a msd dist 8551 never had this problem before any ideals what i might be doing wrong? thanks

  2. #2
    Join Date
    May 2007
    Location
    Kansas
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    1,935

    Default

    Quote Originally Posted by hipower17 View Post
    just got my motor back put timing light on mark is jumping around so much can't get a true timing i have a 2 piece cloyes timing cover on it and a msd dist 8551 never had this problem before any ideals what i might be doing wrong? thanks
    Assume it's a roller cam, do you have a positive stop on the timing cover to keep it from flexing and letting the cam move forward/back some? Like a stop on water pump that adjusts to the cover or a billet stiff timing cover (that may be what the 2 piece cover is - stiff).

    Also check end play on dizzy and polarity on MSD box

    Few things off top of my head, besides another timing light (even a cheap non adjustable one to check it still moves a bunch)

    I also assume someone set the end play on camshaft
    Last edited by billetbirdcage; 03-25-2019 at 07:32 PM.

  3. #3

    Default

    Might check inside distributor. Make sure no problems with advance mechanism unless you have it locked out. Possibly slip collar not set right causing excess distributor gear lash?

  4. #4
    Join Date
    Dec 2008
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    thedirtysouth
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    what type of timing light are you using? i had a dial type do this exact same thing you describe , went back to a old school strobe light and never had another problem......

  5. #5
    Join Date
    May 2007
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    Polarity on the MSD box would be my bet.

    Just say no...

  6. #6
    Join Date
    Jul 2014
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    399

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    You want the light inductive pickup near the plug...not at the cap.

  7. #7
    Join Date
    Dec 2007
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    643

    Default

    it is near the plug. i use the old stroblight type, explain the polarity answer please.
    the dist is locked out. i thank you all for your suggestions

  8. #8
    Join Date
    Oct 2017
    Posts
    1,363

    Default

    If your using a pickup in the distributor and not a crank trigger the pickup wires should be purple and black to green, and orange and black to purple. If it's backwards the box acts very erratic and inconsistent

  9. #9
    Join Date
    Nov 2010
    Posts
    112

    Default

    I've had issues with the heavy racing plug wires before. I always swap out #1 plug wire with an old stock one I have laying around.

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