LS7 clutch swap nightmare
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2004-2007 Cadillac CTS-V Performance Mods Discussion, LS7 clutch swap nightmare in Cadillac CTS-V Series Forum - 2004 - 2007; Well, I figured I should just start a new thread. I've now had my car at the shop for three ...
  1. #1
    Derek5.7 is offline Cadillac Owners Member
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    LS7 clutch swap nightmare

    Well, I figured I should just start a new thread. I've now had my car at the shop for three weeks and counting. I had my mechanic install an LS7 clutch kit from Luke at Lindsay Cadillac (new flywheel, pressure plate, clutch and slave cylinder). Long story short, it has severe clutch creep - w/engine running you cannot get the car in gear, and if you start with the car turned off and put the car in first gear w/the clutch pedal to the floor and then start her up she creeps forward immediately, rather agressively. Bottom line, the slave cylinder is disengaing the clutch partially, but not all the way. We've ruled out the master cylinder - a new factory OEM was installed yesterday and I still have the identical problem). We've ruled out improper bleeds or not enough bleeding - this has been done repeatedly (probably 10 times). So now the mechanic is going to tear it all apart again and look for errors in installation and/or defective OEM parts. But it occured to me that we haven't considered the clutch pedal assembly itself - does anyone know if anything in the pedal assembly itself can get worn out or out of adjustment (leading to improper clutch engagement) or if the hydraulic linkage assembly is adjustable in any way (I don't think the factory MC hyraulic linkage can be adjusted)? I'm looking at spending another $700 in labor to have my mechanic pull it all apart again unless I can identify another likely cause unrelated to the actual LS7 clutch install. Any ideas?

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  3. #2
    heavymetals's Avatar
    heavymetals is offline Cadillac Owners Master
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    Re: LS7 clutch swap nightmare

    Did you install a remote bleeder?

    If you had no pedal trouble before, I seriously doubt that is your problem now.

  4. #3
    ctsv247 is offline Cadillac Owners Enthusiast
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    Re: LS7 clutch swap nightmare

    never did really get an answer as to what the pressure plate was torqued to....

  5. #4
    Derek5.7 is offline Cadillac Owners Member
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    Re: LS7 clutch swap nightmare

    I didn't install a remote bleeder. I had no clutch pedal problems prior to this LS7 clutch install. My mechanic said he torqued the pressure plate to GM spec - 52 ft lbs if my memory is correct. My very real challenge is that I can't tackle this problem in bits, that is, say to my mechanic, "try torquing the pressure plate to such and such" or "put in a new slave cylinder" or "install a new pressure plate" all in the hope that one of these will fix the problem because each time we try "a fix" also means a complete disassembly of the transmission and clutch bellhousing when it wasn't the problem.

  6. #5
    heavymetals's Avatar
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    Re: LS7 clutch swap nightmare

    Your BIG MISTAKE was not having a remote bleeder installed at the same time.

    There are numerous threads that mention this.

    I would bet you have air in the line.

  7. #6
    Derek5.7 is offline Cadillac Owners Member
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    Re: LS7 clutch swap nightmare

    Then how do you account for the thirty or so LS7 clutch swaps performed (to date) by Lindsay Cadillac Dealership in Alexandria, VA that were ALL done WITHOUT remote bleeders? I have simply followed, to the letter, the protocol of Lindsay Cadillac. Luke Butler told me I am the first customer (out of 100's) to NOT have this fix work? Go figure!

  8. #7
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    odla is offline Cadillac Owners Connoisseur
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    Re: LS7 clutch swap nightmare

    Hell since your in again I would get a tick bleeder in now. Would make bleeding easier. My guy didn't even charge me to bleed it when he did the install. Said to easy to do. Didn't want to feel like he was just taking my money.

  9. #8
    ctsv247 is offline Cadillac Owners Enthusiast
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    Re: LS7 clutch swap nightmare

    Bleeding without a speed bleeder isn't a big deal if you have a lift especially if you have something compatible to motive bleeder.

  10. #9
    heavymetals's Avatar
    heavymetals is offline Cadillac Owners Master
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    Re: LS7 clutch swap nightmare

    Quote Originally Posted by Derek5.7 View Post
    Then how do you account for the thirty or so LS7 clutch swaps performed (to date) by Lindsay Cadillac Dealership in Alexandria, VA that were ALL done WITHOUT remote bleeders? I have simply followed, to the letter, the protocol of Lindsay Cadillac. Luke Butler told me I am the first customer (out of 100's) to NOT have this fix work? Go figure!
    They knew what they were doing.

    You need to pump fluid through the system (not pressure feed it ) and master and shut off the the valve while pressure is being applied (without a remote bleeder).

    Using the Motive doesn't pump fluid through the master which catches air bubbles.

    If you must use the Motive, pump the clutch a few times while fluid is flowing.

    This will allow the piston to force air bubbles to move.

    With a remote bleeder you can do it a lot easier, but it still takes two people, at least for me.

  11. #10
    Derek5.7 is offline Cadillac Owners Member
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    Re: LS7 clutch swap nightmare

    heavymetals - the Cadillac dealership is literally less than half a mile down the road. Should I call a tow truck and have my car taken to the Cadillac dealership so they can do a clutch bleed according to spec??? So many people have said this car is a bugger to bleed the clutch. I've told my local mechanic this fact, repeatedly, and he swears he's done it right. So is it time to "cut bait" and see what the Cadillac dealership can do?

  12. #11
    ctsv247 is offline Cadillac Owners Enthusiast
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    Re: LS7 clutch swap nightmare

    You need to at least cycle the master cylinder once with the motive bleeder attached to get all the air out of the piston chambers which is what I did and had no issues doing this by myself.

  13. #12
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    Re: LS7 clutch swap nightmare

    GM modified its clutch bleeding procedure. See attached.
    Attached Files

  14. #13
    Pillow is offline Cadillac Owners Fanatic
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    Re: LS7 clutch swap nightmare

    I would have Lindsay take a look at it since they seem local for you. Luke and Lindsay have always treated us right, and the service department seems decent.

  15. #14
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    Re: LS7 clutch swap nightmare

    If you are close to Lindsay, have Rob do it. Call up Alex in service for an appt. and have Rob Greeley work on it.
    Rob was trained by Bill who was the best...I drive 4 hrs from NY for these guys
    2005 cadillac cts-v.r #83 nasa st3 . 2011 escalade esv . 2011 sierra denali

  16. #15
    2007V is offline Cadillac Owners Member
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    Re: LS7 clutch swap nightmare

    I'm sure you have it bleed, and you don't need a remote bleeder. They are handy for 1 man operations is all.

    Measure the clearance between the clutch and the slave. There is a spec for what the distance needs to be. It seems common for people to need shims.

    Also, make sure the pilot bearing is fully seated. If it is installed flush then it will act just like you are saying. You're going to need to pull the tranny to investigate. I'm sure the Lindsay crew would know what to look for.

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