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Clutch pedal engagement?

Discussion in 'The Garage' started by nofeartruckin00, Sep 13, 2006.

  1. nofeartruckin00

    nofeartruckin00 1/2 ton status

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    Just picked up a '79 k10 w/ 350 and 4 speed floor shift tranny (assuming SM465??)

    I push the clutch pedal to the floor, shift into gear, but when i let off of the pedal, the clutch doesn't seem to engage and start the truck rolling until i am almost complete off the pedal, maybe 2" of travel left until the pedal is back in normal position.

    Does this mean the pedal assembly needs adjustment, or just that the clutch is in need of replacement? :confused:
     
  2. diesel4me

    diesel4me 1 ton status Premium Member

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    both...?

    It definately needs adjusting..it should begin to grab about 1-2" off the floor,and have an inch of "free play" at the top of its travel before any resistance is felt when you push in the clutch..if its been driven too long without any free play,it'll need a new clutch and throwout bearing most likely..but you might luck out if you caught it in time..

    Some trucks have the linkage "Z" bar flex excessively, and it alters the adjustment..I've had to weld a flat "stiffener" bar across them to beef them up and prevent flexing there..if you adjust the clutch,and a few days later it is out of whack again,its probably the "Z" bar between the frame and engine block thats bending..I had many plow trucks with 12" 3 lever pressure plates bend, and eventually break the linkage bars on the "Z" bar...:crazy:
     
  3. nofeartruckin00

    nofeartruckin00 1/2 ton status

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    I'll have to take a look for the Z bar, haven't checked that for flex. As far as the adjustement goes, is that made in the push rod inside the cab, or somewhere else?
     
  4. diesel4me

    diesel4me 1 ton status Premium Member

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    usually...

    Yes,most of the older trucks had A threaded rod between the "Z" bar and the fork on the bellhousing to adjust the clutch..its been awhile since I looked at the pedals on a manual tranny truck--I don't recall any adjustment on the push rod between the pedal and "Z" bar,but I suppose its possible some did..mine had a solid rod with no threads..:crazy:
     
  5. MattK

    MattK 1/2 ton status

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    yeah ive got bits of a couple linkage setups here and bolt of them have a threaded rod between the z-bar and clutch fork.
     
  6. nofeartruckin00

    nofeartruckin00 1/2 ton status

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    Alright, thanks guys! I found the adjustment under the cab, and now the clutch will engage much closer to the floor. Only problem now is that the pedal can come up too high. It won't do it by itself too often, but I can pull it up by hand, and hear something chattering (like when you try to grind into the next gear kind of noise). How do I adjust the stop so the pedal won't come back so far? Thanks again!
     
  7. BROKEN-ONE

    BROKEN-ONE Registered Member

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    pic of fork to z-bar

    does anyone have a pick of the adjuster from the fork to the z-bar , i have had the same problem , but i think i am missing a piece that goes into the dish part of the fork . sorry about the hijack . thanks for any help .
     
  8. MattK

    MattK 1/2 ton status

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    its just a rod with threads at one end. the threaded end threads into a cube that has a pin to go through the zbar.

    if you are MISSING this piece, the clutch wont be disengaging at all. if you are in fact missing it, i have a couple extras.
     
  9. supersize75k5

    supersize75k5 OrganDonorRacing.com

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    go to your chevy dealership, they can print the blow up of it for ya
     
  10. walla2k5

    walla2k5 1/2 ton status

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    This is what you'll get...


    [​IMG]
     
  11. BROKEN-ONE

    BROKEN-ONE Registered Member

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    thank you

    thanks , that break down helped alot .:D
     
  12. BROKEN-ONE

    BROKEN-ONE Registered Member

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    springs

    i had no idea there was suposed to be 2 springs . a long one and a short one . :doah:
     
  13. MattK

    MattK 1/2 ton status

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    lol same here...i dont have either on mine right now :haha:
     
  14. BROKEN-ONE

    BROKEN-ONE Registered Member

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    springs continued

    i have the long spring , will any spring work as long as it is the right length ?
     
  15. nofeartruckin00

    nofeartruckin00 1/2 ton status

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    On that diagram, which one are you calling the "z bar"?
     
  16. BROKEN-ONE

    BROKEN-ONE Registered Member

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    z-bar

    it's called a bell crank lever . it is the piece that goes to the tranny to the frame . :D
     

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