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Technical SBC starter

Discussion in 'The Hokey Ass Message Board' started by Ron Brown, Apr 2, 2021.

  1. Ron Brown
    Joined: Jul 6, 2015
    Posts: 1,632

    Ron Brown
    ALLIANCE MEMBER

    Update...... installed an 0.020 shim and all is right with the world......thanks to all that responded with thoughts and ideas


    Sent from my iPhone using H.A.M.B.
     
    jimmy six likes this.
  2. 1971BB427
    Joined: Mar 6, 2010
    Posts: 7,052

    1971BB427
    Member
    from Oregon

    There aren't two different ways to ensure proper gear engagement between ring gear and starter gear. There's no relationship between how far away the starter gear is from the flywheel gear, and how the two gears mesh. The starter gear could be 1/8" away, or 1/2" away, and it wont affect how the two mesh.
    Only way to insure the starter gear and ring gear mesh properly is to set how deep the gears engagement is. So shimming will make the depth more or less, depending on which side you put the shims under the starter. Put the shims on the block side between starter and mounting surface and it closes the gap and makes the engagement tighter. Put the shim on the outside away from the engine block, and it opens up the gap and loosens engagement or mesh.
     
  3. Ron Brown
    Joined: Jul 6, 2015
    Posts: 1,632

    Ron Brown
    ALLIANCE MEMBER

    I think you are misunderstanding me....took this directly off a GM website showing method A and method B....there was also a method C that involves painting the spur gear to check for proper alignment. 220051AE-1036-4A47-AE7A-1E7832771EDE.jpeg
     
    Just Gary likes this.
  4. Don't want to Hi-Jack this thread, but need a quick answer. Like most of you, I've been replacing SBC starters, since I could drive. But helping friend, with his Hot Rod. '47 Ford with a 1970 Impala 350/350 combo. Power-Master starter actually slipped on the flywheel, so swapped in an Autozone example(reman), supposedly made for the Impala year and engine. Whined like my wife in the morning!!! Yikes!! LOL
    Pulled the Bendix out to examine clearance(did not measure) seemed ok to add shims, which I did. After adding 3 thin shims, it still makes a horrible noise. Yes, all the pieces appear to be in good condition, based on my 40+ years of experience. And yes, it has the front support bracket.
    Going to look at that clearance number tonight after work, using an 1/8" allen wrench.
    Thanks
    JT
     
  5. Doublepumper
    Joined: Jun 26, 2016
    Posts: 1,081

    Doublepumper
    Member

    Probably just needs shimmed to get it right.
    If not using the proper style starter bolts, shimming may not correct it. I've seen this more than once.
     
  6. Atwater Mike
    Joined: May 31, 2002
    Posts: 10,707

    Atwater Mike
    ALLIANCE MEMBER

    Ha! My former neighbor was a '69 Camaro pilot, he replaced a starter in that Bowtie beast and it howled like a Culver City quickie in a metal phone booth.
    I walked over, gave him 2 shims from my 'starter parts shelf', he shimmed it, and I went back home.
    Police Story was on...
     
    Desoto291Hemi likes this.
  7. wulf powis
    Joined: Jun 19, 2017
    Posts: 64

    wulf powis
    Member

    Is the dust cover on between the bell housing and the engine block? it adds about 1/16 inch of space, also loosen and retighten the starter if not. spacing is everything!
     
  8. Ha!!
    Just fell off my barstool and spilled my beer


    Sent from my iPhone using H.A.M.B.
     
  9. Appreciate the advice, Fellas. Removed all shims, last night and took measurement, using 1/8" allen wrench, per instructions. It's actually a bit on the loose side. And still a bit noisy.
    Q: anyone ever milled off the nose cone like .010"?? (top mounting surface) to get it closer??? At that point, could always add a shim to make it perfect. Always striving for perfection.
    Thanks.
    JT
     
  10. jimmy six
    Joined: Mar 21, 2006
    Posts: 10,004

    jimmy six
    ALLIANCE MEMBER

    Take off more than you think you will need. Shim back to correct .020” clearance.
     
  11. sdluck
    Joined: Sep 19, 2006
    Posts: 2,796

    sdluck
    Member

    I worked in a gm shop.one of the guys taught me to swap the nose cone to the new starter.
     
    stillrunners likes this.
  12. Budget36
    Joined: Nov 29, 2014
    Posts: 7,265

    Budget36
    Member

    If you shim
    One side, won’t the starter gear go closer to the ring? Just thinking maybe.
     
  13. Bump up because I'll be working on this Saturday....
     
  14. Ericnova72
    Joined: May 1, 2007
    Posts: 477

    Ericnova72
    Member

    Yes, shimming just the outboard bolt increases mesh/decreases clearance. It swings the starter into the ring gear deeper.

    shim both, starter moves away, ...shim just outer, sterter gear moves in closer
     
  15. Ron Brown
    Joined: Jul 6, 2015
    Posts: 1,632

    Ron Brown
    ALLIANCE MEMBER

    I have a new Delco starter....the old starter has 11 teeth gear this new one has 9 teeth....the paperwork says the new starter works with either 153 or 168 tooth ring gear....it also says the 9 tooth is interchangeable with 11 tooth.....how can this possibly be true.
     
  16. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,480

    Johnny Gee
    Member
    from Downey, Ca

  17. Ron Brown
    Joined: Jul 6, 2015
    Posts: 1,632

    Ron Brown
    ALLIANCE MEMBER

    jakespeed63 likes this.
  18. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,480

    Johnny Gee
    Member
    from Downey, Ca

    There's actually a much easier answer. The center line of the armature/bendix isn't in the same location.
     
    jakespeed63 likes this.
  19. How about some pictures and literature illustrations
     
  20. Ron Brown
    Joined: Jul 6, 2015
    Posts: 1,632

    Ron Brown
    ALLIANCE MEMBER

    F2FEC42A-3F10-4B55-8C86-FB215C70B6FF.jpeg 7B14581B-E571-447C-B74B-CA6CF45C7027.jpeg 28D64F54-8478-40FE-9983-ADA893691E2D.jpeg DB663EE3-6521-4447-AB46-FFACC55D2059.jpeg
    both starters have exact same shaft centerline measured from bolt hole to block mating surface and both shafts mic out exactly the same.
     

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