Citroen GS LHM sight tube questions
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  1. #1
    Fellow Frogger!
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    Default Citroen GS LHM sight tube questions

    Hi our GS looks like it might be suffering from low LHM level, It's fitted with the LHM tank with the sight tube running vertically down the outside of the tank. There's no sight glass on top of the tank like it shows in some owners manual.

    Just wondering if anyone here whose familar.. are there min and max marks on this sight tube. And do you top up the LHM by taking off the creamy coloured LHM cap that's embossed "LHM"

    The low LHM has presented with the car not wanting to rise. It was out this morning working ok but the fluid level in the sight glass looks about an inch up from the bottom and this afternoon.. not rising

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    The owners manual we have in the glovebox illustrates the other type of LHM tank. And a Haynes manual is sadly lacking when it comes to detailed illustrations or instructions.

    Thanks
    John

  2. #2
    Fellow Frogger! XM Mechanic's Avatar
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    Hi John,

    There are two "Ribs" towards the bottom of the tank. The top rib is full. The bottom is low. Checked with car on high.

    Sorry, no pictures.
    Regards,

    Garth.


    Fixin' Cit's and got the shits.


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  3. #3
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    Hi Garth
    Thanks for your post!

    There's a link below to some images of our LHM tank. In image 1 are the "ribs" the rings that run horizontally around the tank. In image 2 is the cream LHM cap what you remove to top up. And is the other green cap held in place with the wire clip where you find the LHM filter. Hopefully the links below work!

    With the car not rising at all at the moment, it won't be possible to be on high (high being as far back towards the back of the car as the lever will go?).

    How do you suggest we tackle this.. top up the LHM in small stages until we get over the min mark? Out having another look there's no min or max mark on the sight tube. I'd say the current LHM level is about the same distance below the bottom rib around the LHM tank as difference between the upper and lower ribs.. about an inch below min.

    Which setting do you suggest we use for suspension height - forward, middle or rear?
    Forward is normal, middle being for paddock work, rear for changing tyres.

    Image 1 side view of LHM tank
    https://www.facebook.com/photo.php?f...size=720%2C960

    Image 2 top of LHM tank
    https://www.facebook.com/photo.php?f...size=720%2C960


    Regards
    John
    Temporarily doing a PHD in LHM
    Last edited by J'aime la vie; 17th September 2015 at 12:11 PM.

  4. #4
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    Wow - the hydraulics on your GS must be ultra-reliable!

    I had to learn this stuff straight away when I bought a Xantia - my first Cit.

    Cheers - and good luck with the steep learning curve!

    Alec

  5. #5
    Real cars have hydraulics DoubleChevron's Avatar
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    if your concerned about it being low .... with the car flat on the ground (eg: after it's been sitting all night) add some LHM until you can clearly see it from the filler cap. You can't "overfill" a car with LHM, unless you fill the tank when it's at normal ride height ( in the case it will overflow when the car settles.... which won't do any damage, but will obviously make a mess).

    I'd rather have way to much LHM in there, then too little. Try unplugging the plastic level straw at the top. If it's blocked it won't show the correct level (as air can't enter/exit at the top of the tube).

    seeya,
    Shane L.
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  6. #6
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    Hi Shane thanks... with the filler cap.. is this the cap with LHM stamped on it. Or the green cap with the wire clip further to the rear. They are pictured in the earlier links..

  7. #7
    Real cars have hydraulics DoubleChevron's Avatar
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    Quote Originally Posted by J'aime la vie View Post
    Hi Shane thanks... with the filler cap.. is this the cap with LHM stamped on it. Or the green cap with the wire clip further to the rear. They are pictured in the earlier links..
    I haven't seen that reseviour before. But the big white cap is the filler cap. The one with the wire clip on it will probably have a big filter housing attached to it. Try removing it and clean the filer with petrol and compressed air. You can't hurt anything so long as none of the rubber hoses are hard and split when removed

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/showthread.php?t=90325
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

  8. #8
    1000+ Posts gerrypro's Avatar
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    Its the same as the tank in my 1972 1220. These are the early tanks. Judging by the dark staining in the sight tube the car could use a really good flush out and refill with clean fluid. GS cars allow the engine oil to mix with the LHM due to a poorly designed seal in the pump that is driven directly off the crank shaft of the motor. They need cleaning and flushing regularly. Most owners neglect this ( even me)!
    Cheers Gerry

  9. #9
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    Thanks Gerry.. simply topping up the LHM and running the engine has not seen the car rise. So next step might be to clean the filter,
    see if there's a bleeder screw somewhere or totally flush the system. Any words of experience appreciated. Can feel something moving in the black rubber hose that runs towards the front of the car from this tank. Just not sure if there might be air in the system somewhere.

  10. #10
    1000+ Posts gerrypro's Avatar
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    There is a bleed screw on the regulator.
    Are you leaking LHM at the front of the car? If so the boot around the pump that receives the Hose that feeds the pump may be leaking and drawing air instead of fluid!
    Cheers Gerry

  11. #11
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    Hi Gerry there's newspaper under the car so will look in the morning for leaks. But assuming any leaks will be green like the LHM, don't think I have.

    Rgds John

  12. #12
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    If the car is fully lowered you could top up the LHM tank to about an inch over the high rib to start with.

    It sounds like you have sucked air into the pump because the fluid level was so low. Hence the reason it will not rise.

    If you top it up to the above suggested amount it will eventually suck it from the tank. You could pour it down the pump feed tube but it can get messy and if the tube is old it will break if you bend it too far.

    There is a bleed screw on the top of the regulator, under the spare tyre, a 12mm bolt. DON'T undo it more than 1/2 a turn when bleeding the system.

    You can try loosening the bleed screw and then starting the car. Run for 5 mins until the pump has been bleed. Then close and the car should rise pretty quickly after that.

    Then put the car on high, fully aft on the interior lever, and check the fluid level and fill to high, top rib.

    Normal operation of the car is in the fully forward position.

    Let us know how you go.
    Regards,

    Garth.


    Fixin' Cit's and got the shits.


    '15 DS 5
    '74 GS Convertisseur

    In the family
    '51 Traction
    '08 C5 X7 V6

    Previous ownership
    '95 XM V6 Series 2
    '96 306 XTDT

  13. #13
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    Hi Gareth thanks for such clear instructions on how to do this, very appreciated. The GS has now risen! After letting run for 5 mins, turning off, closing bleed screw bolt and restarting.. i think it rose in about a minute and went up quite quickly. Our LHM sight tube looks a bit black more than green as pointed out by Gerry. So ultimately we'll need to clean filter, buy some fresh LHM and replace the current LHM, clean sight tube. But for today the GS has risen. Thanks again..

    Image showing pressure regulator bleed screw.
    https://www.facebook.com/photo.php?f...size=960%2C720

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