Thread size for 3.5mm hydraulic end fittings...
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  1. #1
    Tadpole
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    Default Thread size for 3.5mm hydraulic end fittings...

    Hi, does anyone know what are the thread size for the end fittings on 3.5mm hydraulic lines? Or shall i say what size are the end fittings...?
    This is for a C5.

    Thanks.

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  2. #2
    Fellow Frogger! marc61's Avatar
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    Standard M8 thread for the fittings on the 3.5mm pipe on the CX, Xantia, XM.
    Don’t know about the C5 as that’s a bit modern for me, but would imagine it’s the same.
    Cheers, Marc.

    1987 CX GTi T2 Maikonics
    1972 SM 2.7 carb
    1972 DS21 EFI

  3. #3
    Fellow Frogger! citroenthusiast's Avatar
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    Quote Originally Posted by marc61 View Post
    Standard M8 thread for the fittings on the 3.5mm pipe on the CX, Xantia, XM.
    Don’t know about the C5 as that’s a bit modern for me, but would imagine it’s the same.
    FWIW,, standard M8 = M8 x 1.25 pitch
    Cheers,
    John T.

    54 11BL; 61DS19 LHM (son's); 71DS21 BVH; 73SM 3.0; 73SM 2.7EFI; 73SM 3.0 (other son's); 74 Maserati Merak

  4. #4
    Fellow Frogger
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    The C5 is different to the earlier cars and I don't think it uses the old style rubber pipe seals. The fitting for the Xantia/XM would be M8x1.25, but it appears to be different on the C5's 3.5mm piping. Some of the suspension piping uses bonded steel/rubber rings (#4) instead and that also made an appearance on some high pressure lines on late Xantia. The best option is likely salvaging the parts required from a wreck.

    Thread size for 3.5mm hydraulic end fittings...-c5_pipe_seals.jpg
    Last edited by David S; 2nd May 2018 at 11:35 PM.

  5. #5
    Tadpole
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    Thank you gentlemen. I suspected it was M8 but was not sure. I guess we will have final confirmation once i rip apart the pump. Car is not rising. The pump is running but not pumping. I suspect electrical faults, ie the solenoid valves are not opening at the pump. I have Lexia connected but cant clear the fault. I will post update after i do more experimenting.

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