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2004-2007 Cadillac CTS-V Performance Mods Discussion, Revshift Motor Mounts with Headers in Cadillac CTS-V Series Forum - 2004 - 2007; you're probably hitting the bell housing off the transmission tunnel. Also, don't jack your engine up by any part of ...
  1. #31
    robojesus is offline Banned
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    Re: Revshift Motor Mounts with Headers

    you're probably hitting the bell housing off the transmission tunnel. Also, don't jack your engine up by any part of the oil pan, that is seriously one of the worst ideas i have ever heard of.

  2. #32
    FuzzyLogic is offline Banned
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    Re: Revshift Motor Mounts with Headers

    Quote Originally Posted by robojesus View Post
    Also, don't jack your engine up by any part of the oil pan, that is seriously one of the worst ideas i have ever heard of.
    That's ignorance speaking.

  3. #33
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    Re: Revshift Motor Mounts with Headers

    Quote Originally Posted by FuzzyLogic View Post
    That's ignorance speaking.
    you mean in your original post telling people to jack it up by soft aluminum? use a block of wood and jack it up by the damn bellhousing.

    you crush that pan, there's a good chance you're buckling your pickup tube.

  4. #34
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    Re: Revshift Motor Mounts with Headers

    The pan is actually a cast aluminum piece and it is relative stout (for an oil pan). The advantage to jacking there is that its directly under the mass. If you move back to the bellhousing you are jacking behind the mass of the engine and actually adding a huge moment to the bellhousing. It a little thicker in the bellhousing, but the added stress would more than cancel that out.

    For what its worth, the Cadillac service doc for replacing the mounts tells you to jack from the oil pan in step two...click here

  5. #35
    robojesus is offline Banned
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    Re: Revshift Motor Mounts with Headers

    Wow, not sure why GM would encourage doing things half assed. For the amount of risk involved in using a hydraulic jack on an oil pan, you're more well suited to remove your intake, bolt a hoist to a valley cover hole, and hold it up that way.

  6. #36
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    Re: Revshift Motor Mounts with Headers

    Quote Originally Posted by robojesus View Post
    Wow, not sure why GM would encourage doing things half assed. For the amount of risk involved in using a hydraulic jack on an oil pan, you're more well suited to remove your intake, bolt a hoist to a valley cover hole, and hold it up that way.
    Your complaint seems arbitrary. If GM and end-users have found that the pan is strong enough to handle the roughly 450 lb weight, what's the problem? That they could shave a few millimeters of material off the pan and a couple of ounces of weight? Clearance?

  7. #37
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    Just in case someone in the future has the same problem i wanted to report back. Got the brackets to separate from the frame by jacking the engine higher. Turns out the weight makes the suspension squat more than i would have thought. Also worth noting is that with the manifolds and cats off, the mount/bracket assembly can go in/out as a whole and doesn't have to be taken apart on the car. Also, loosen the two outer sub-frame to chassis bolts and it'll give you more clearance. Hopefully i can get the headers and new exhaust together tomorrow so i can test everything out. The drivers side mount looked fine, but the passenger side was split in half and had leaked out all it's fluid

  8. #38
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    Re: Revshift Motor Mounts with Headers

    Quote Originally Posted by robojesus View Post
    you mean in your original post telling people to jack it up by soft aluminum? use a block of wood and jack it up by the damn bellhousing.

    you crush that pan, there's a good chance you're buckling your pickup tube.
    Even though Fuzzy is a douche, he's right on this one.

    It's not like you are taking a bottle jack and torquing it up in one little spot and poking a hole in the pan.

    Just take a square piece of wood the size of the pan and distribute the weight evenly. No doiy.

    I've done it more than a few times on the V and it's just fine.

  9. #39
    FuzzyLogic is offline Banned
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    Re: Revshift Motor Mounts with Headers

    You don't need a piece of wood. If you're paranoid, just don't plant the jack in the center of the pan.

  10. #40
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    Re: Revshift Motor Mounts with Headers

    Use a piece of wood.

  11. #41
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    I sharpened the top of my bottle jack down to a needle point so it wouldn't slip off the oil pan
    FuzzyLogic and FuzzyLogic like this.

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