Dany's Magnum swap starter engagement issues

Magnum Engine Swaps

  1. motorpirate

    motorpirate serial mopar owner

    Messages:
    286
    Likes Received:
    127
    Joined:
    Nov 4, 2007
    Location:
    northern KY
    Local Time:
    4:20 AM
    So Danys Magnum swap into our '66 Cuda is almost done.
    Only thing missing is a heater hose nipple that the local parts place will have in the morning.
    So we decide to start it up with no coolant for a second and see what it sounds like.
    Horrible grinding, no engine turning!!!
    I mean like a Chevy with the nose broke off the starter!!
    A little background:
    '66 Barracuda originally a 273/904.
    Engine and trans original to the car and in working order
    Magnum installation went without surprises as we read literally every word on here first.
    Except...
    When we bought the engine i told them i needed the flex plate and starter off the donor vehicle.
    A 2000 Durango.
    When we went to put the Durango starter on it would not fit as it is hitting a projection on the block that is not there on the 273.
    Not to be delayed we put the original starter back on. And it fit.
    Now with the original Trans/converter/starter the starter does not have enough "throw" to engage the ring gear on the torque converter!!
    I can only think the Magnum flex plate has moved the converter back just a bit??
    I mean this bellhousing and starter and converter are all original to the car and the only thing different is the flex plate, right??
    As to the Mini starter not fitting it was not with the engine when we picked it up and came off a shelf in the office when I asked about it, so not "really" sure it is correct.
    I'm going to take it to the parts place with me in the AM and have them pull one for comparison to make sure it's the right application.

    So, Our questions are:

    If the mini starter is correct is it hitting the block because an early A starter is closer to the crank centerline? I know all about the early VS late converters, but do they have different diameter ring gears?

    Does the Mini starter have more "throw" so it will reach the converter in its new position if we grind the offending bump off the block? Not looking forward to that now that the motor and Doug's headers are already installed!!

    We are using the original Magnum Flexplate as it has the weights on it.
    Any alternatives to this?

    I cannot believe after all this the motor is probably coming back out...
    HELP!!
     
  2. motorpirate

    motorpirate serial mopar owner

    Messages:
    286
    Likes Received:
    127
    Joined:
    Nov 4, 2007
    Location:
    northern KY
    Local Time:
    4:20 AM
    Some pics

    20190522_173724.jpg

    20190522_174133.jpg

    20190522_174142.jpg

    20190530_171127.jpg

    20190606_102306.jpg

    20190607_123453.jpg
     
  3. Dubob

    Dubob Well-Known Member

    Messages:
    1,179
    Likes Received:
    384
    Joined:
    Oct 28, 2011
    Location:
    Ohio
    Local Time:
    5:20 AM
    Sounds like they gave you the wrong starter. I thought the minis were all interchangeable. But I’ve been wrong before. You’re using the original trans and converter to the car. The only thing I can think is the register in the crank where the converter goes isn’t machined or possibly is the wrong diameter and pushing the converter out maybe. One other thought is the flex plate installed correctly as far as the proper side facing the block. Just some random thoughts on my end.
     
  4. motorpirate

    motorpirate serial mopar owner

    Messages:
    286
    Likes Received:
    127
    Joined:
    Nov 4, 2007
    Location:
    northern KY
    Local Time:
    4:20 AM
    I have an adaptor for the small register vs big crank hole now.
    Flex plate is installed with the crank sensor ring towards the trans.
    I am hoping the starter is wrong.
     
  5. motorpirate

    motorpirate serial mopar owner

    Messages:
    286
    Likes Received:
    127
    Joined:
    Nov 4, 2007
    Location:
    northern KY
    Local Time:
    4:20 AM
    Problem solved!!!!
    Bendix drive of the original starter hitting the tone ring of the Magnum flex plate.
    Mini starter hitting a projection on the Magnum block.
    Die grindered it off and the Mini starter fits!!
    An early A trans must have the starter closer to the centerline of the block than later transmissions...

    20190609_105013.jpg

    20190609_115432.jpg

    20190609_120454.jpg
     
    • Like Like x 1
    • Dubob

      Dubob Well-Known Member

      Messages:
      1,179
      Likes Received:
      384
      Joined:
      Oct 28, 2011
      Location:
      Ohio
      Local Time:
      5:20 AM
      Thank you for posting your finds and what fixed it.
       
    • motorpirate

      motorpirate serial mopar owner

      Messages:
      286
      Likes Received:
      127
      Joined:
      Nov 4, 2007
      Location:
      northern KY
      Local Time:
      4:20 AM
      I have a whole list...
      Going to make a separate post for it.
       
    • MopaR&D

      MopaR&D Nerd Member FABO Gold Member

      Messages:
      3,828
      Likes Received:
      681
      Joined:
      Jan 4, 2008
      Location:
      Fort Collins, CO
      Local Time:
      3:20 AM
      I had this same exact problem with a Magnum block hooked up to an old 904 in my Duster. I think all the pre-Magnum transmissions have the starter located differently, or maybe the 904 I got was made for an early A-body (I'm not totally sure of the year). I couldn't try an older "jumbo" starter because of my headers so I ended up having to clearance the block just like you did.
       
      • Like Like x 1
      • triumphman

        triumphman FABO Gold Member FABO Gold Member

        Messages:
        120
        Likes Received:
        14
        Joined:
        Sep 5, 2013
        Location:
        Oklahoma
        Local Time:
        3:20 AM
        I had the same problem with the block. And grinding was the answer. I used the original factory flex plate from my 75 Swinger with the 318/904. However, my last issue is a vibration. Early magnums were externally balanced, while later were internally. Changed balancer's 3 x, flex plates and torque converters.
        I am interested with your results.
         
      • motorpirate

        motorpirate serial mopar owner

        Messages:
        286
        Likes Received:
        127
        Joined:
        Nov 4, 2007
        Location:
        northern KY
        Local Time:
        4:20 AM
        we have a 5.9 with an early magnum truck balancer and the original Magnum flex plate with weights.
        No vibration issues.
         
      • Bobzilla

        Bobzilla Well-Known Member

        Messages:
        500
        Likes Received:
        321
        Joined:
        Aug 10, 2017
        Location:
        Livonia, Michigan
        Local Time:
        5:20 AM
        Are you running a 5.9 or 5.2 Magnum? All 5.9 Magnums have the same external balance, but they changed the location of the weight from torque converter on earlier 5.9 to the flex plate on the later 5.9. They also changed the style of the balancer, but they were weighted the same.
         
        • Agree Agree x 1
        1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
          By continuing to use this site, you are consenting to our use of cookies.