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Technical Oldsmobile crank pilot bushing struggle

Discussion in 'Traditional Hot Rods' started by spacecowboy81, Oct 6, 2019.

  1. spacecowboy81
    Joined: Dec 9, 2012
    Posts: 67

    spacecowboy81
    Member

    I am mating a '57 371 Olds to a '55 slant pan hydramatic transmission. This should be easy but I've had to figure things out because the back of my 371 crank didn't have a bushing on it and the factory manual for 1957 of course only discusses the later transmission not the hydro.

    Now I know I need a pilot bushing and the pilot bushing is held in place by a steel retainer. I looked back at my '49 engine and see the same setup. Any one know where I can get this steel retainer?? Or how I can get the one off my '49 crank? I used PB blaster and a slide hammer to no avail. Heres a pic of the back of the crank, the retainer, and the bronze bushing on my '49 engine: 20191002_175133.jpg
     
    loudbang likes this.
  2. studebakerjoe
    Joined: Jul 7, 2015
    Posts: 516

    studebakerjoe
    Member

    Did you try filling the hole with grease then putting a tight fitting round rod into the hole and hammering it into the grease? Basically hydraulically pressing it out.
     
  3. Budget36
    Joined: Nov 29, 2014
    Posts: 2,584

    Budget36
    Member

    I've packed the hole with toilet paper and done the same...takes about 1/2 a roll I recall
     
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  4. flamedabone
    Joined: Aug 3, 2001
    Posts: 4,550

    flamedabone
    ALLIANCE MEMBER

    Some guys use bread, but I have never tried it. I use the old fashioned stuff it full of grease and drive a tight fitting socket in it technique.

    -Abone.
     
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  5. bonneville bones
    Joined: May 17, 2006
    Posts: 126

    bonneville bones
    Member

    Slide hammer with a hook on the end


    Sent from my iPhone using H.A.M.B.
     
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  6. CGkidd
    Joined: Mar 2, 2002
    Posts: 2,830

    CGkidd
    ALLIANCE MEMBER

    I've had to do that to get the steel shield off before.
    Sent from my E6910 using The H.A.M.B. mobile app
     
    loudbang likes this.
  7. Peanut butter works, and is not as difficult to clean up. If you hit your thumb, it doesn't taste as bad.
    Bob
     
  8. studebakerjoe
    Joined: Jul 7, 2015
    Posts: 516

    studebakerjoe
    Member

    J-jock between the bread and peanut butter you could make lunch while forcing out the bushing
     
  9. bonneville bones
    Joined: May 17, 2006
    Posts: 126

    bonneville bones
    Member

    Mmmmmmm


    Sent from my iPhone using H.A.M.B.
     
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  10. Just be aware of the potential for a balance issue with this combination...
     
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  11. Charlie Jones
    Joined: Apr 3, 2009
    Posts: 66

    Charlie Jones
    Member
    from Apopka FL.

    I have an extra bushing and a retainer hanging around somewhere .
    PM me .
     
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  12. s55mercury66
    Joined: Jul 6, 2009
    Posts: 3,722

    s55mercury66
    Member
    from SW Wyoming

    One can also run a tap into the bushing and it will bottom out on the crank while forcing the bushing out. Use the smallest tap possible, it doesn't need to cut usable threads.
     
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  13. ekimneirbo
    Joined: Apr 29, 2017
    Posts: 533

    ekimneirbo
    Member
    from Brooks Ky

    I haven't fooled with any old Olds engines, but I didn't think an automatic ever used a pilot bearing. Is this some kind of oddball thing that Olds did? I do know that long long ago you could get "straight stick" olds vehicles, but I never saw an automatic with a pilot bearing.
     
  14. CGkidd
    Joined: Mar 2, 2002
    Posts: 2,830

    CGkidd
    ALLIANCE MEMBER

    4 speed hydro used pilot bushing to support input shaft inside the Taurus.
    Sent from my E6910 using The H.A.M.B. mobile app
     
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  15. just Mike
    Joined: Jun 17, 2012
    Posts: 35

    just Mike
    Member
    from langley bc

    Bread works amazing, even on the roller bearing style. One slice does it and no greasy mess to clean up!
     
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  16. 302GMC
    Joined: Dec 15, 2005
    Posts: 5,848

    302GMC
    Member
    from Idaho

    All single & dual range hydros use a pilot bearing or bushing … don't remember on '56 up.
     
  17. Barrelnose pickup
    Joined: Aug 20, 2008
    Posts: 886

    Barrelnose pickup
    ALLIANCE MEMBER

    I do the same as ms55mercury66 said,I run a tap into the bush,then use a bolt of the same size and as you tighten the bolt,the bush just slides out.
     
  18. J. A. Miller
    Joined: Dec 30, 2010
    Posts: 1,247

    J. A. Miller
    ALLIANCE MEMBER
    from Central NY

    That retainer looks like a core plug with a hole in it. If that's true, can't you do a little measuring and modify one?
     
  19. Paul
    Joined: Aug 29, 2002
    Posts: 14,436

    Paul
    Editor

    Take a close look at the '57 crankshaft, it likely needs machining to accept the pilot bushing, if it does, have the shop also give the rotating assembly a neutral balance to work with the early transmission.
    If by chance the crankshaft will take the bushing as is, you will still need to address the balance issue, take the balancer, crankshaft and torus cover in to have them all balanced together.
    Either way the balance issue will need to be addressed.
     
    warbird1 likes this.
  20. wuga
    Joined: Sep 21, 2008
    Posts: 308

    wuga
    ALLIANCE MEMBER

    Because Olds mostly came with automatics, they felt machining the pilot hole was a waste of resources. I take it you are going to a standard transmission so index the hole to verify it is centered and then machine down your pilot bearing to fit using one of the methods mentioned above. That is what I had to do.

    Warren
     
  21. poprivit
    Joined: Jun 27, 2010
    Posts: 76

    poprivit
    ALLIANCE MEMBER
    from Hagerstown

     
  22. poprivit
    Joined: Jun 27, 2010
    Posts: 76

    poprivit
    ALLIANCE MEMBER
    from Hagerstown

    I borrowed a pilot bushing puller from Autozone , worked great !
     
  23. VANDENPLAS
    Joined: Dec 14, 2009
    Posts: 1,991

    VANDENPLAS
    Member

    50C51C35-5D5E-4342-AE7A-EBA93B794CC4.jpeg

    Blind hole bearing puller
    Works great for this kind of stuff

    The grease and punch thing eitknreally well also
     
  24. s55mercury66
    Joined: Jul 6, 2009
    Posts: 3,722

    s55mercury66
    Member
    from SW Wyoming

    We found this out by accident, when as teenagers, we needed a pilot bushing, and had to reuse the one in the old motor. We found that by running the tap in, and bottoming it out against the crankshaft, it just pushed the bushing right on out. This was on a '66 GTO, with the ubiquitous Muncie 4 speed, and since we used the smallest tap we could, it cut some fairly light threads in the bushing. We felt it would retain grease better that way :)
     

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