Citroen DS power steering o rings
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  1. #1
    Tadpole
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    Icon7 Citroen DS power steering o rings

    Hello all fellow DS enthusiasts.
    I have leaks in my DS seal plates on my power steering.
    I think the o rings have hardened.
    They seem to be square profile 8x 4 x 2mm o rings. The only ones I can source from local parts suppliers are round profile. Will they work? David Williams

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  2. #2
    Fellow Frogger! citroenthusiast's Avatar
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    Yes, you can use AN size -008 O-rings instead. It is usually a good idea to lap the seal plates on a piece of glass with some 600 grit wet or dry paper so that it is .060 inches or less in thickness. If you can find size -008 quad rings these are even better. They stay in place like the square rings and actually seal over a wider range of gaps than either O or square rings.
    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

  3. #3
    Tadpole
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    Thanks for that John,
    Not quite sure what you are saying.
    -008 quad rings? If I asked that of my local parts shop it would start their eyes spinning.
    Lapping of the plates makes absolute sense. Should have thought of that myself!
    A genuine power steering repair kit is available from England but very expensive. Might have to ask if they can provide the correct o rings separately.
    Thanks very much for your valued input mate!
    Cheers. David Williams

  4. #4
    Fellow Frogger!
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    The parts manual lists the o-rings as being 4.2 x 8 x 1.9. There are 4 at the rotating union and 2 at the power piston. Due to the pressures involved and how the plates fit together, round o-rings tend to end up looking like square section ones. The seal kits from europe contain round section o-rings and they work fine. There is much debate about whether Citroen used round or square section o-rings at the factory and general consensus is they used whatever was on hand each day. As a general, the parts manuals donít specify one or the other.

    Which fluid is your car using? It makes a difference as to which rubber the seals are made from.

  5. #5
    BVH Roger Wilkinson's Avatar
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    Use the metric 4x 2 mm o-rings. They are slightly thicker than AS 008 o-rings (1.78 mm if I recall) and will seal better. In Australia they are easy enough to obtain.

    There would be very few red fluid power steering Dees on the road in Australia.

    Roger

  6. #6
    Fellow Frogger! citroenthusiast's Avatar
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    Roger is correct that a 2mm metric O-ring is thicker than an AS-008 ring so it will seal better if you can source them. Here in the states we have limited a supply of metric O-rings so we use AN sizes for most static applications. I have found that a -008 quad ring works perfectly. However, you typically have to go to an industrial supplier to get them, or resort to eBay... https://tinyurl.com/y23ozmsx
    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

  7. #7
    Fellow Frogger!
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    Quote Originally Posted by faulksy View Post
    Which fluid is your car using? It makes a difference as to which rubber the seals are made from.
    What would be a suitable material for these rings for use in an LHM rack please?
    1968 DS21bvh Pallas in Gris Palladium

    Restoration blog: https://ds-restoration.blogspot.co.uk

  8. #8
    BVH Roger Wilkinson's Avatar
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    I use comon-or-garden nitrile o-rings for LHM applications and EPDM for LHS applications.

    Roger

  9. #9
    Tadpole
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    A big thank you to all 'froggies' that replied to my post.
    I took a punt & used the round profile metric O rings. They worked!!!
    However I now have a new problem someone may be able to help me with. A fellow D enthusiast sent me a complete DS ignition switch assembly he rescued from a wreck. It arrived without a key. I took it to a local locksmith to get one cut. When he disassembled the barrel he found that the die cast aluminium lugs on the barrel were broken ( a common fault apparently). He had a die cast barrel from a 2CV which fitted. Like an idiot I did not check the Bakelite contact block before refitting the switch back into the dash. It is faulty( another common problem I found). Can anyone help me with obtaining another contact block?
    Cheers. Dave

  10. #10
    BVH Roger Wilkinson's Avatar
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    Dave, I can't help with your new problem.

    You might have more success if you start a new thread on this topic and copy your post into it. That way the topic will be clear from its title.

    Roger

  11. #11
    Tadpole
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    Thanks for that Roger. Citroen Classics in the UK may be able to help me.
    Dave

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