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Technical Carb/Trans Linkage Adjustment Needed South Orange co. Calif.

Discussion in 'The Hokey Ass Message Board' started by Gregorys Speed Shop, Feb 25, 2022.

  1. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    GNRS 2022 (11).JPG Hello
    Looking for a shop that can do a small Carb?Trans Linkage Adjustment
    South Orange co. California
    I have a 50 Olds still has the 303 with a Vintage Duel Carb set up & Hydro
    I had some head work done they did not get linkage adjusted correctly
    I do not want to take it back to them
    Their basic work on older cars is ok but their attention to detail was not there
    I may try to do it myself but I thought I would reach out here too
    It should be an easy job for someone with the right experience
    The gas pedal hits the floor before I get into the p***ing gear
    it seems to be off by about an inch or so
    I climb a long steep mile long hill to get home
    looking to get it done within the next few weeks
    I can drive to you waiting while work gets done
    my schedule is flexible
    car shows coming up in April
    Thanks
    Darrell
    714.747-7193
     
    Paul likes this.
  2. 73RR
    Joined: Jan 29, 2007
    Posts: 7,342

    73RR
    Member

    You should probably own a service manual for the car and see if you could do the adjustment yourself.
     
  3. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thank You I do have a few shop manuals but it is not a stock set up
     
  4. jaracer
    Joined: Oct 4, 2008
    Posts: 3,059

    jaracer
    ALLIANCE MEMBER

    I looked up the adjustment for a 48 Olds and it isn't simple. Too many rods and bell cranks and the manual calls for a special tool. I'd probably try lengthening the rod from the carb a bit at a time and see how it affects upshifts and downshifts.
     
  5. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thanks
     
  6. jimmy six
    Joined: Mar 21, 2006
    Posts: 17,159

    jimmy six
    ALLIANCE MEMBER

    How far south in Orange County?
     
  7. alanp561
    Joined: Oct 1, 2017
    Posts: 5,605

    alanp561
    ALLIANCE MEMBER

    @Paul can probably help you out with that.:)
     
  8. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    I am in Laguna Beach, but I can drive to someone my schedule is flexible just want to find the right person/place
     
  9. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    ok Thanks
     
  10. Moriarity
    Joined: Apr 11, 2001
    Posts: 37,765

    Moriarity
    SUPER MODERATOR
    Staff Member

    adjustment of the throttle pressure rod/linkage is a tricky and critical adjustment. This is far more than merely kickdown linkage, it controls the upshifts also. It is not really a good idea to drive it if it is not adjusted properly. There is a hydro social group here
    https://www.jalopyjournal.com/forum/social-forums/hydro-tech.671/

    maybe they can help you figure it out
     
  11. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thank You
     
  12. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thanks
     
  13. PhilA
    Joined: Sep 6, 2018
    Posts: 2,116

    PhilA
    Member

    I don't have the special tools for mine and it is a different linkage setup, but I would work in this order:

    1. Lock all bell cranks- there's usually 3 holes in each that line up at the idle position. I use a screwdriver that fits snugly. The lower bell crank will likely have a similar set of holes. You may need to slack the rods off for that to happen.

    2. Set the carburetor idle and balance with the upper linkage disconnected. If it idles nicely with the linkage unhooked, ignore this step.

    3. Set the carburetor linkage so that it is just on the very verge of slack, making sure the fast idle/choke stops are in their "off/hot" position.

    4. Set the bars between the bell cranks- no slack.

    5. Set the gearbox linkage to have a fraction of an inch of free play with the lever back toward the rear of the vehicle.

    6. Remove bell crank locks, and set throttle pedal height so you have about 1/2" gap under it at full throttle where it hits the stop.

    That should get your downshift to about 8/10ths the way down the gas pedal range, which is where it should be, from memory.

    Phil
     
  14. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thank You for all of this. I will look it over
     
  15. Paul
    Joined: Aug 29, 2002
    Posts: 16,982

    Paul
    Editor

    Looks like you have good advice so far.
    I've been playing with the early Olds engines for 40+ years and the only two cars that had automatics came to me with all linkage in place and working until the day I sold them.
    All the rest have had standard transmissions.
     
    Moriarity likes this.
  16. rbrewer
    Joined: Mar 16, 2011
    Posts: 556

    rbrewer
    Member

    Good reading, not trying to hi jack the thread , but am hoping to learn more about the 2 carburetors
    thanks, good luck with the adjustment!!
     
  17. Paul
    Joined: Aug 29, 2002
    Posts: 16,982

    Paul
    Editor

    here are some scans from the '50-'51 Shop Manual

    Fig. 11-181.jpg Fig.11-182.jpg Fig.11-183.jpg Fig.11-184.jpg Fig.11-185.jpg



    "76"-"98" Shift Points
    76-98 shiift points.jpg


    "88" Shift Points
    88 shift points.jpg
     
  18. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

  19. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thanks
    I will get some info to you on these soon, I should have something typed up, this is a good excuse to do that. getting ready for a morning cruise spot followed by an Olds Club event tomorrow. the history on these carbs is interesting
     
  20. PhilA
    Joined: Sep 6, 2018
    Posts: 2,116

    PhilA
    Member

    Lawdy, they went to town with the levers, so my adjustment method is still mostly valid, but you need to make sure that Cross Shaft ***embly "D" is locked with the pin when you adjust up, else you run the risk of it going over-center and causing the throttle to lock shut.
     
  21. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thanks
     
    PhilA likes this.
  22. ekimneirbo
    Joined: Apr 29, 2017
    Posts: 5,429

    ekimneirbo
    Member
    from Brooks Ky

    Don't really know anything about this setup, but I'll wade in anyway. I know that on the later model overdrive transmissions, if you don't set the TV cable correctly, you can ruin the trans very quickly. I know this is not the same thing, but I'm wondering IF you might damage your transmission if you do drive it that way? Also, on the later model transmissions, the best way to adjust the TV cable is by putting a pressure guage on the trans and adjusting till a certain pressure is achieved. Would it be possible to do something similar on your trans ? Again I know its not a direct comparison of apples to apples, but since you have a non-standard set-up, maybe it would be doable??????
     
  23. PhilA
    Joined: Sep 6, 2018
    Posts: 2,116

    PhilA
    Member

    Hydra-Matic works a little differently to later model TH- series transmissions in terms of the kickdown. It's a solid rod linkage with no spring to return it; as with many transmissions the position of the lever changes the internal pressure in the valve body and both delays and makes shifts more positive the harder the pedal is pressed down. The downshift only acts on a valve to knock the gear from 4 to 3 (and then allow upshift at about 65 mph, 3rd gear max speed).

    Having the link adjusted too slack means that it will slip the clutches more on a shift than it should, causing greater wear.
    Having it adjusted too short means it will change gear too soon with neck-jarring force.

    Unfortunately the only hydraulic pressure available externally on the gearbox is behind a plug on the top of the gearbox, which is the main line pressure (which shouldn't change much from 60-65psi in all gears other than R, which is ~120psi on the later cone-clutch reverse models which I thiiiiink this one has, but I could be wrong).
    Either way the pressure tells you little other than the overall health of the hydraulics.

    Phil
     
  24. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thank you for the information
     
    PhilA likes this.
  25. Gregorys Speed Shop
    Joined: Jun 27, 2008
    Posts: 25

    Gregorys Speed Shop
    Member
    from So Cal

    Thanks
     

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