Tip for guy's running older MSD Pro Billet Distributors!

Discussion in 'High Performance Modifications' started by ZYAL8R, May 8, 2012.

  1. ZYAL8R

    ZYAL8R Veteran Member Gold Member

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    Just a bit of info for you guy's. If you have an older MSD distributor you need to pull the cap off and check out the internals. Due to condensation mine rusted up which in turn created drag. This caused the distributor gear to wear pretty bad, I am hoping that the cam will be O.K.. If not I will be replacing my roller cam with less than 600 miles on it. So if you guys are having some issues with timing or the car seems like its not running right, check the Distributor. MSD now coats there Distributors to keep this from happening.
     
  2. Joekool

    Joekool Veteran Member

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    Hmm roller cam and you said you had gear wear? Did you use a bronze gear or maybe it was brass? Which ever one you are supposed to use with roller cams.
     
  3. kik_start

    kik_start BANNED

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    rusted up internals under the cap shouldn't cause gear wear on the cam.
    The distributor gear can fail but not likely the cam gear did.

    About the only thing that will cause gear wear is misaligned cam...too far back, too far forward of too much end play.
    The height that the distributor is installed can cause problems too.
     
    Last edited: May 8, 2012
  4. $ Mike 70 Z-28

    $ Mike 70 Z-28 Veteran Member

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    mine looked like you pulled it out from the river i called msd and they sent me a new one out right away. very good service
     
  5. ZYAL8R

    ZYAL8R Veteran Member Gold Member

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    You do not have to use a brass or composite gear with a roller cam if it has a cast cam gear, which mine does. Most cam companys now are putting cast gears on there cams for this reason.


    Mine was rusted so bad that the Mechanical advance was stuck and could not even be moved by hand. Did you know that really high oil pressure can also cause your distributor gear to fail.
     
  6. Turbo70Camaro

    Turbo70Camaro Veteran Member Gold Member

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    [​IMG]

    Updated dist. cap with hooded vent next to coil terminal :) had same problem put new reluctor and mag pickup with updated cap.
     
  7. camaro454

    camaro454 Veteran Member

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    Just pulled cap today and same problem.
     
  8. kik_start

    kik_start BANNED

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    don't think so, unless your oil is like 90w gear lube...

    ever been to north dakota in the winter? their distributor gears lasted just as long as in the south...

    the mechanical advance works from centrifigal force
     
  9. $ Mike 70 Z-28

    $ Mike 70 Z-28 Veteran Member

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    i driled two holes on the side in the back of the cap to vent better
     
  10. Show7d3

    Show7d3 Veteran Member Lifetime Gold Member

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    I've been running the same electronic MSD distributor since the mid 90's and never had any corrosion. My cap has a little window in it- like the kind you flip up to adjust dwell and I removed the cover. The main reason it was removed was due to a misfire I couldn't fix. I think what was happening was the air in the cap (being non-vented at the time) was being ionized, especially from the multiple sparks from the ignition box, and the spark was jumping to the wrong terminal. Vented the cap and the problem went away. Sounds kind of crazy but it worked for me.
     

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