CX 25 rear rises slow and stays up for ...
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  1. #1
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    Default CX 25 rear rises slow and stays up for ...

    The front comes up within a minute, the buzzer stops and the rear takes 3 to 5 min to come fully up. drives ok. Rear stays up for about two days after shut down.

    Any ideas would be greatly appreciated! Blockage? Any known spots? Dodgy valve somewhere?

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  2. #2
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by JoBo View Post
    The front comes up within a minute, the buzzer stops and the rear takes 3 to 5 min to come fully up. drives ok. Rear stays up for about two days after shut down.

    Any ideas would be greatly appreciated! Blockage? Any known spots? Dodgy valve somewhere?

    Heavens Jo, I thought you were telling my life story from the title of the thread...

  3. #3
    Real cars have hydraulics DoubleChevron's Avatar
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    LHM hasn't been changed or the filters cleaned ...... ever that you know of right

    You'll need to change the LHM and clean the filters in the reseviour. You will also need to whip the rear height corrector off, dismantle it and clean all the black sludge out of it. Just clean it in petrol. It's probably the lowest point in the hydraulics so the gunk is collecting there.

    seeya,
    Shane l.
    Last edited by DoubleChevron; 22nd July 2012 at 11:20 AM.
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  4. #4
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    Thank you Shane!
    Sorry Rob, can't give medical advise over the net
    "The enemy of knowledge is not ignorance, it's the illusion of knowledge"
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  5. #5
    Fellow Frogger! Andy N's Avatar
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    Quote Originally Posted by DoubleChevron View Post
    LHM hasn't been changed or the filters cleaned ...... ever that you know of right

    You'll need to change the LHM and clean the filters in the reseviour. You will also need to whip the rear height corrector off, dismantle it and clean all the black sludge out of it. Just clean it in petrol. It's probably the lowest point in the hydraulics so the gunk is collecting there.

    seeya,
    Shane l.
    Couldn't have explained it in fewer words Shane. Does sound like a gunged up rear height corrector doesn't it!
    I know a CX turbo owner who thought that he might need new rear spheres because the damping didn't seem right. He changed the LHM (which he had not done in the few years he owned the car) and it totally fixed the underdamped rear. Those new rear spheres sitting on the shelf may not ever go in.

    It makes sense to me in that the "fabric" of the oil must break up over time. As it is forced through various valves and heats and cools it becomes "thinner".....like when you first whisk an egg it is viscous but after a short time it becomes more runny. Engine oil does this too but as it's exposed to even greater pressures and heat it happens much quicker than in the hydraulic system.

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