EAS: Non return Valves, where to get ?
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Thread: EAS: Non return Valves, where to get ?

  1. #1
    FRESHMAN ROVER
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    EAS: Non return Valves, where to get ?

    Hi,

    rebuilding valve block Ive seen that non return valves are not in great shape. Aluminum Cone is not regular and present some debris. (Ive fine polished them)

    Where can I get new ones ?



    thanks
    ----------------------------------------------

    P38 2.5 DT

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  3. #2
    Premium Member
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    Unless Shupack,(Rover Renovations) can help I guess a new valve block is the only place you will find them.I had a car in last week with one valve that was really badly worn,luckily I have a few S/H blocks on the shelf so it was OK.
    Think beyond -

  4. #3
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    I have some used ones available, havn't found them new (but I've got one with a machine shop to try and copy economically) but those look fine. the cone is just for basic location, the oring does the sealing. clean that barb off and it should be ok.

    from what I can tell it looks like the oring won't fall off, as long as it holds tight put it in and make sure it doesn't leak (evidenced by "odd" behavior but nothing really wrong. #1 sypmptom of a leaky check valve is the front rising and lowering slowly when stopped at a light and the compressor running.

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  6. #4
    JUNIOR ROVER
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    Quote Originally Posted by shupack
    #1 sypmptom of a leaky check valve is the front rising and lowering slowly when stopped at a light and the compressor running.
    Sorry to hijack this thread slightly - Whenever I stop at the lights & leave my foot on the brake I seem to hear the EAS compressor running (YES it IS the compressor, not the ABS pump). Strange thing is when I take foot off the brake the compressor stops for a few seconds......I haven't noticed the raising & lowering though.

    Is that likely to be the check valves?

    Cheers,
    Chrisall.
    Alt4 - The Open Source Range Rover Diagnostics Project
    http://www.swiftcomm.co.uk/alt4/

  7. #5
    FRESHMAN ROVER
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    Quote Originally Posted by chrisall
    Quote Originally Posted by shupack
    #1 sypmptom of a leaky check valve is the front rising and lowering slowly when stopped at a light and the compressor running.
    Sorry to hijack this thread slightly - Whenever I stop at the lights & leave my foot on the brake I seem to hear the EAS compressor running (YES it IS the compressor, not the ABS pump). Strange thing is when I take foot off the brake the compressor stops for a few seconds......I haven't noticed the raising & lowering though.

    Is that likely to be the check valves?

    Cheers,
    Chrisall.
    Check valves (non-return valves) the picture attached, are pasives. I mean, they just open air circulation in one way and stops in the opposite. they arent electronic commanded.

    This is a supposition:
    If compressor runs its because height sensors say it to run, normaly a sensor saying Im Low!!! pump to rise me.
    Compressor runs till:
    - sensors feel at right height.
    - thermal switch complains, stop too hot, and then EAS fault
    - Pressure switch say EAS got 10bars, too much. Stop pumping.

    I supouse this becase Ive not seen there exist a sensor for pressures thresholds, for instant: a sensor saying stop at 10bar, star at 9bars, in charged of keeping air tank with enough pressure.

    Then, If Im right, you have a leaky spring, line, connexion or valveblock or EAS logic is malfunctioning, but I dont think so.
    ----------------------------------------------

    P38 2.5 DT

  8. #6
    FRESHMAN ROVER
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    Quote Originally Posted by shupack
    I have some used ones available, havn't found them new (but I've got one with a machine shop to try and copy economically) but those look fine. the cone is just for basic location, the oring does the sealing. clean that barb off and it should be ok.
    Hummm, I think this non-return valve is not working fine.
    yesterday night I put back rebuilded valveblock and compressor, It worked (note below) and leave it normal height. This morning I found car at Extra height, it raised. As soon as I started car it went down to Normal height.
    So I suppouse that I have a leak form air tank to air springs, this is the circuit of one of the non-return valve (Im triying to find the Rave schema to check this).

    So, O-ring close the hole, but bad cone, perhaps, make that oring do not seat fine.

    regards.

    note: After puting back all the stuffs, start engine and few minutes latter car begin to rise ..... Oh! dear. Have you seen this movie Tom Hanks , alone at an island.... Fire!!!!, Ive got Fire!!!!!: the same
    ----------------------------------------------

    P38 2.5 DT

  9. #7
    wpr
    wpr is offline
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    Good job Jesus!!
    Congratulations!!!!

    About your previous post: one thing:
    To my knowledge the compressor does not stop when the hight sensors are happy.
    Only reasons for stopping the compressor:
    1. enouhg pressure
    2. too much heat
    3. ignition more than 2 minutes off
    4. broken compressor


    But glad you found the fire!!

  10. #8
    FOUNDING MEMBER
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    Quote Originally Posted by chrisall
    Quote Originally Posted by shupack
    #1 sypmptom of a leaky check valve is the front rising and lowering slowly when stopped at a light and the compressor running.
    Sorry to hijack this thread slightly - Whenever I stop at the lights & leave my foot on the brake I seem to hear the EAS compressor running (YES it IS the compressor, not the ABS pump). Strange thing is when I take foot off the brake the compressor stops for a few seconds......I haven't noticed the raising & lowering though.

    Is that likely to be the check valves?

    Cheers,
    Chrisall.
    That's normal operation. If it's running too long, you either have leaks, or a worn out compressor or both.

    we're talking about 2 totally different functions on this one. When you take your foot off the brake, the ECU tells the compressor to stop because you may be going up an on-ramp onto the highway so:

    1 you need all the power you can get, don't want the compressor to be a load on the alternatory

    2 you may be going down to higway height soon, no need to keep pumping.

    I know it's silly logic, but that's what the ECU has to work with.

  11. #9
    FOUNDING MEMBER
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    Quote Originally Posted by jesusg9
    Quote Originally Posted by shupack
    I have some used ones available, havn't found them new (but I've got one with a machine shop to try and copy economically) but those look fine. the cone is just for basic location, the oring does the sealing. clean that barb off and it should be ok.
    Hummm, I think this non-return valve is not working fine.
    yesterday night I put back rebuilded valveblock and compressor, It worked (note below) and leave it normal height. This morning I found car at Extra height, it raised. As soon as I started car it went down to Normal height.
    So I suppouse that I have a leak form air tank to air springs, this is the circuit of one of the non-return valve (Im triying to find the Rave schema to check this).

    So, O-ring close the hole, but bad cone, perhaps, make that oring do not seat fine.

    regards.

    note: After puting back all the stuffs, start engine and few minutes latter car begin to rise ..... Oh! dear. Have you seen this movie Tom Hanks ,
    alone at an island.... Fire!!!!, Ive got Fire!!!!!: the same
    You would have 6 leaky valves, a non-return valve, the tank isolation valve, and the spring isolation valves. The isolations hold air IN their tank/spring only, the tank should be sealed off completely, air could leak into the springs, but with pressure on the top of them they should seal both directions.

    If there was a temperature change that can put you at a higher height, in the springtime temperatures here can go from 45 to 90F in a day, that will raise Darcy almost 2" (when the ECU is unplugged to prevent leveling).

    Check valves are never designed to be a perfect isolation anyway, they just help direct air. the solenoid valves do the isolation.

  12. #10
    JUNIOR ROVER
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    Quote Originally Posted by shupack
    Quote Originally Posted by chrisall
    Quote Originally Posted by shupack
    #1 sypmptom of a leaky check valve is the front rising and lowering slowly when stopped at a light and the compressor running.
    Sorry to hijack this thread slightly - Whenever I stop at the lights & leave my foot on the brake I seem to hear the EAS compressor running (YES it IS the compressor, not the ABS pump). Strange thing is when I take foot off the brake the compressor stops for a few seconds......I haven't noticed the raising & lowering though.

    Is that likely to be the check valves?

    Cheers,
    Chrisall.
    That's normal operation. If it's running too long, you either have leaks, or a worn out compressor or both.

    we're talking about 2 totally different functions on this one. When you take your foot off the brake, the ECU tells the compressor to stop because you may be going up an on-ramp onto the highway so:

    1 you need all the power you can get, don't want the compressor to be a load on the alternatory

    2 you may be going down to higway height soon, no need to keep pumping.

    I know it's silly logic, but that's what the ECU has to work with.
    Thanks for that - I couldn't for the life of me think why the compressor stops when I take my foot off the brake !!! I think it is running a bit too long, probably due to the front springs (I've changed the rears already).

    Cheers,
    Chrisall.
    Alt4 - The Open Source Range Rover Diagnostics Project
    http://www.swiftcomm.co.uk/alt4/

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