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Technical SBC starter gear adjustment

Discussion in 'The Hokey Ass Message Board' started by Jawsmon, Mar 6, 2021.

  1. Jawsmon
    Joined: Dec 29, 2010
    Posts: 30

    Jawsmon
    Member

    I have the opposite problem of most guys. I have a new SFI flex plate and a new starter. The teeth of the starter are too far away from the teeth on the flex plate. This is without any shims. If I put in any shims it would move the starter teeth further away from the flexplate teeth. Is there any way to move the starter closer to the flex plate? I thought of trying to oblong the mounting holes on the starter to move it closer but that's not nearly as simple as it sounds since the bolts pass right tight to the starter housing at the center of the bolt hole channel

    Is there anyone out that that successfully remedied this problem?
     
  2. triumph 1
    Joined: Feb 9, 2011
    Posts: 582

    triumph 1
    Member

    How far away is it?


    Sent from my iPhone using H.A.M.B.
     
    tractorguy likes this.
  3. 34Phil
    Joined: Sep 12, 2016
    Posts: 330

    34Phil
    Member

    shim the outside bolt only
     
    brando1956, squirrel and egads like this.
  4. osut362
    Joined: May 15, 2013
    Posts: 31

    osut362
    Member
    from East Texas
    1. Upholstery

    yes there is. The shim that moves the starter toward the ring gear is short and goes under the outside bolt only. Thereby "rocking the starter" in the direction of the ring gear, won't move it much but maybe enough.
     
    brando1956 likes this.

  5. TCATTC
    Joined: Oct 12, 2019
    Posts: 285

    TCATTC
    Member

    I have had to take the end frame off the starter and mill some off it on a couple early Big blocks. You could probably do the same with a belt sander, just be careful and don't take off too much.
     
  6. badshifter
    Joined: Apr 28, 2006
    Posts: 3,372

    badshifter
    Member

    If it’s a new mini starter, you may have it installed upside down causing your problem. Depending on brand and clocking, it’s possible to mount it both ways, but only one works.
    Pics?
     
    Atwater Mike and tractorguy like this.
  7. Tickety Boo
    Joined: Feb 2, 2015
    Posts: 1,441

    Tickety Boo
    Member
    from Wisconsin

    S.B.C. has two diffrent size flexplates a 153 tooth or 168 tooth, also if it bolts to the block from the bottom
    "not to the bellhousing" some blocks/starters have 2 sets of holes, or you have to use the right starter for the size flexplate.
    I would start by counting the teeth on the new flexplate v/s the original one
     
  8. squirrel
    Joined: Sep 23, 2004
    Posts: 50,316

    squirrel
    Member

    Pictures are a big help.

    Also, the instructions that come with the starter might help, but you might not have them, or might have not found the info you need in them.

    With stock Chevy starters, half a shim at the outside hole will move it closer, a full shim will move it away. They require 1/8" clearance between shaft and gear teeth...but mini starters don't have a shaft, so you have to check gear engagement. How far off is it?
     
    tractorguy likes this.
  9. KoolKat-57
    Joined: Feb 22, 2010
    Posts: 3,038

    KoolKat-57
    Member
    from Dublin, OH

    Is the flex plate on backwards?
    Saw that a few times, starter won't engage flex plate!
    KK
     
  10. jivin jer
    Joined: Sep 14, 2008
    Posts: 3,120

    jivin jer
    Member

    Thanks for the trip Jim, it was excellent.
     
  11. Jawsmon
    Joined: Dec 29, 2010
    Posts: 30

    Jawsmon
    Member

    Thanks bunches for all the input. I have milled off the mounting surface of the starter. I really like the idea of shimming the outside bolt only as well.

    FYI... the 168 tooth flex plate was installed correctly. I'm using a starter with the offset bolt pattern. A starter with the straight bolt pattern won't even go in the hole because there's interference between the starter nose and the bell housing. I have a small milling machine in my shop so milling off the starter mounting surface was really easy to accomplish. I'm waiting for a new starter gear to arrive before I try reinstalling the starter. If I still have problems then I will shim the outside bolt.

    Thanks again for all the ideas.
     
    Tickety Boo likes this.
  12. 37gas
    Joined: May 25, 2013
    Posts: 97

    37gas
    Member

    I'am in my mid 70 s never heard of starter shims until them dam Chinese got involved. What I do is find the right starter for my flywheel and have it rebuilt and it work just like factory, Your problem is off shore crap
     
    olscrounger and nunattax like this.
  13. 54vicky
    Joined: Dec 13, 2011
    Posts: 1,599

    54vicky
    Member

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