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Jerky Starts

Discussion in 'Early CJ5 and CJ6 Tech' started by tgregg, Oct 2, 2005.

  1. Oct 2, 2005
    tgregg

    tgregg Member

    Oak Hills, CA...
    Joined:
    Apr 14, 2005
    Messages:
    529
    I have a 69 225 with a RUG top loader 4 speed, D-18 T/K OD and posi (of some sort) in the rear. 4:88's.
    I have rebuilt everything mechanical from the front bumper to the back of the T/K.
    My problem is It about rips your head off when trying to start from a stop. I can make it smooth but it is a very tedious process of SLOWLY feathering the clutch.
    By the way I have the AA chain linkage.
    Anyone got any thoughts? PS I'm not thrilled with the Hurst shifter, it is so stiff and the adjustment is very touchy on the rod linkage to the trans. I had it working well then found a mount (shifter) bolt loose. Tightened it up and now need to go back and readjust the rods.
     
    tgregg, Oct 2, 2005
    #1
  2. Oct 3, 2005
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    Greg, there's something about the AA linkage...
    I run a T18 with the granny low, and experience similar situations.

    On the street, starting in 2nd, I can feather it pretty smoothly to start. BUT, if I try to start in 1st gear, there's no way I can feather it... no matter how smooth I try to be, it's nothing... and then LAUNCH!!

    Offroad I usually do the trails in low range, 2nd /3rd gear. The more dirt/muddy water that gets in to the clutch area (unavoidable, deep mud holes :D ) the worse that gets. To avoid that launch offroad, I usually start in gear without the clutch.
     
    lynn, Oct 3, 2005
    #2
  3. Oct 3, 2005
    barry

    barry Inquisitive Member

    Earp, CA
    Joined:
    Sep 23, 2002
    Messages:
    195
    I'm running the stock clutch linkage with a clutch from Krage and 4.88s. Don't seem to have that problem. Maybe the AA is the culprit??
     
    barry, Oct 3, 2005
    #3
  4. Oct 3, 2005
    tgregg

    tgregg Member

    Oak Hills, CA...
    Joined:
    Apr 14, 2005
    Messages:
    529
    Hi Barry,
    Yes, I have no doubt the AA is the culprit. The question is OK what now.
    Anybody out there tried the AA 716639.
     
    tgregg, Oct 3, 2005
    #4
  5. Oct 3, 2005
    willysnut

    willysnut Banned

    Newnan, Ga.
    Joined:
    Oct 8, 2003
    Messages:
    654
    I converted mine to a similiar setup as the AA chain linkage, I have a shudder from a stand still start, I figured it was the clutch or flywheel rough after a episode in a creek when the bellhousing drain hole was plugged up( I drained it after a week). I think the shudder is worth the trouble when the frame is all twisted up off road and I can't get the pedal to return from the floor. Learning to adapt.
     
    willysnut, Oct 3, 2005
    #5
  6. Oct 3, 2005
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
    Messages:
    1,035
    Mine also is very abrupt at takeoff. I sometimes will have my rider on a trail ride drive for awhile - just have to remember to tell them to be careful or the first takeoff will just about break your neck.

    I think it has to do with the clutch linkage (stock or chain) some but also the clutch fork pivot geometry. Some useful info on this subject on the Novak sight. I plan to attempt changing the stock linkage so that it takes more pedal throw to move the fork. This would be changing the length of a tab on the pivot shaft that goes from t-case to frame.

    Has anyone done this?


    1970 CJ-5, 225 V-6, headers, HEI, PS, D30 Fr, 44 Rr, ARB's, SM420 w/ Novak, D18 twin stick, 33" TSL Radials, Ramsey REP 5000, Sky Jacker Soft Ride,
     
    AKCJ, Oct 3, 2005
    #6
  7. Oct 3, 2005
    Toolmaker

    Toolmaker Member

    Westminster, SC
    Joined:
    Oct 3, 2005
    Messages:
    132
    I have a '71 CJ5 and it does the same thing. I've only had it for about a week now, but I have noticed that the clutch cable has been replaced with a bellcrank style mechanical linkage. I've had two different '73 CJ5's in the past and the clutch on them was much more progressive, not "on or off" like my '71. I also believe the linkage or pivot points can be modified to give a more progressive feel to the clutch. That is on the top of my project list.

    Yes, I'm a newbie here and this is my first post. Hello to all!

    Matt
     
    Toolmaker, Oct 3, 2005
    #7
  8. Oct 3, 2005
    jcarson

    jcarson Member

    illinios
    Joined:
    Sep 5, 2005
    Messages:
    86
    why not forget all the linkages and go to hydralic?i converted mine and it works ok.jmo,thanks,jared
     
    jcarson, Oct 3, 2005
    #8
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