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Thread: D2 Power Steering Pump Hose O-Ring?

  1. #1
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    D2 Power Steering Pump Hose O-Ring?

    Apologies for the long post and I have hunted the forum but as far as I could find, this doesn’t crack a mention anywhere.
    I have a power steering fluid leak in my 2004 Disco 2a TD5 that appears to be coming from either the front PAS pump shaft seal or the union where the high pressure hose screws into the side of the PAS pump outlet. I can’t pinpoint the leak despite having cleaned down several times. Each time I find oil blown around that area and a drip hanging as can be seen in the photo which is of the underside of the PAS pump with front direction at the bottom of the photo.
    PAS Leak.jpg
    It is not the end of the world but it is annoying having an oil leak as it is so uncharacteristic for a Land Rover ........



    With an oil film visible ahead of the high pressure hose union this would suggest the pump shaft seal is leaking but I would have thought that is unlikely as the PAS pump was replaced with a new genuine LR pump 1 ˝ years ago and has done less than 6000km. It was fitted by a LR Stealer workshop and cost the previous owner a bomb (I have the receipts). If it is the shaft seal, can this be replaced or am I up for another new pump?

    The other potential leak candidate could be the high pressure PAS hose union where it screws into the pump outlet. Microcat indicates an O-ring seal P/N QYX100260 located where the high pressure pipe screws into the PAS pump and would seem a likely leak path if this is damaged during installation or is missing.
    PAS O-Ring QYX100260 V2.JPG

    However this is not mentioned in the Rave Workshop Manual which only mentions an O-ring located under the low pressure inlet adapter pipe. With no significant oil leaking when the car is stationary, this would suggest that the low pressure inlet connection is not the source of the leak. Rave PAS pump removal and refit is as follows:

    Remove
    1. Remove auxiliary drive belt.
    2. Remove 3 bolts securing PAS pump pulley and remove pulley.
    3. Position tray to catch spillage, release PAS pump pressure pipe.
    4. Remove clip and release PAS pump inlet hose.
    5. Remove 4 bolts and remove PAS pump.
    6. Remove bolt, and remove mounting bracket from PAS pump.
    7. Remove 2 bolts, remove low pressure adapter pipe and discard 'O' ring.


    PAS Adaptor Pipe.png (Note this diagram is upside down)
    Refit
    1. Clean PAS pump and adaptor pipe.
    2. Fit new 'O' ring to adaptor pipe, fit pipe and tighten bolts to 10 Nm.
    3. Position mounting bracket to PAS pump, fit but do not tighten bolt.
    4. Position PAS pump and align pump drive to coolant pump. Fit and tighten bolts to 25 Nm.
    5. Tighten mounting plate bolt to 25 Nm.
    6. Clean PAS pump and pipe union.
    7. Fit and tighten PAS pump pressure pipe to 20 Nm.
    8. Fit PAS pump inlet hose and secure with clip.

    As can be seen, no mention of said O-ring on the high pressure pipe as shown in Microcat. Any gurus out there able to shed light on this please?
    Martin

    The secret to happiness is to truly want what you already have
    Oil leak?...Nah, sophisticated anti corrosion system!


    ‘04 D2a TD5 Manual “Snowy” – Daily
    ‘04 Def 90 TD5 "Hue" – New toy
    ‘03 Def 90 TD5 – Son's toy
    ‘16.5 D4 TDV6 – Gone




  2. #2
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    Had the exact same leak on my pas pump, cleaned area and tightened feed pipe bolts and pressure pipe union which has stopped the leak but suspect it will need a seal/gasket kit put through it.
    D2 2004 TD5 Classic

    --------------------------------------

  3. #3
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    I tried to tighten my pressure union but no joy. Does anyone know if there is an O-ring behind it?

    I am still not sure if it is my pressure union or the front shaft seal. If it is the front shaft seal, I plan to have a go at replacing it and of course all the other seals. Apparently the replacement seals kit with the plastic and yellow-goo split body gasket seems to have a high failure rate going by reports on other forums, so I plan to use this “uprated” gasket. You can download a bit of a tutorial on it.

    The “uprated” gasket does look the business and I haven’t come across any negative feedback but I have to wonder why the original manufacturers didn’t use something like this. Has anyone had any experience with this alternative gasket?

    I also found a couple of PAS pump rebuild YouTube clips

    Power Steering Pump Rebuild Land Rover Discovery 2
    Land Rover Discovery II 2 Power Steering Pump Rebuild

    They are both on V8 PAS pumps but appear to be the same as the TD5 pumps just with a different back cover that accommodates the water pump. Can anybody please confirm if this is the case.

    I appreciate any feed back.
    Martin

    The secret to happiness is to truly want what you already have
    Oil leak?...Nah, sophisticated anti corrosion system!


    ‘04 D2a TD5 Manual “Snowy” – Daily
    ‘04 Def 90 TD5 "Hue" – New toy
    ‘03 Def 90 TD5 – Son's toy
    ‘16.5 D4 TDV6 – Gone




  4. #4
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    I have mine in bits at the moment. There is an o-ring inside the high pressure fitting.
    I suspect I have a cracked case from when I tried to lever it out, as it seems to still be leaking after new seals were installed.
    I take a closer look tomorrow.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Nanocom(V8 only)

  5. #5
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    There is an o-ring inside the high pressure fitting.
    Is that a little o-ring about 11mm OD?

    Thanks for the heads-up re cracking the case, I will lever mine out very gently.
    Martin

    The secret to happiness is to truly want what you already have
    Oil leak?...Nah, sophisticated anti corrosion system!


    ‘04 D2a TD5 Manual “Snowy” – Daily
    ‘04 Def 90 TD5 "Hue" – New toy
    ‘03 Def 90 TD5 – Son's toy
    ‘16.5 D4 TDV6 – Gone




  6. #6
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    I gave the pump a good going over tonight after filling it with oil, there is a possibility it isn’t leaking after all. It’s a bit hard to tell sitting on the bench. The next few days will tell. If this is the case, I must have slightly moved the two pieces of the pump causing the gasket to fail.
    Yes, the o-ring is about 11mm.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Nanocom(V8 only)

  7. #7
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    Yes, the o-ring is about 11mm.
    Brilliant, thanks.
    I have two of those little suckers (P/N QYX100260) so plan-A is to try changing it out while losing as little fluid as possible - but this could get messy.
    I must have slightly moved the two pieces of the pump causing the gasket to fail.
    Was the split body gasket the plastic film with yellow goo type?
    Did you torque the four bolts to 18Nm.
    Last edited by Max Headroom 2.3m; 23rd May 2019 at 12:57 AM. Reason: I forgot a bit
    Martin

    The secret to happiness is to truly want what you already have
    Oil leak?...Nah, sophisticated anti corrosion system!


    ‘04 D2a TD5 Manual “Snowy” – Daily
    ‘04 Def 90 TD5 "Hue" – New toy
    ‘03 Def 90 TD5 – Son's toy
    ‘16.5 D4 TDV6 – Gone




  8. #8
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    Yes and yes.
    When I said I must have moved the two pieces, I meant when I was levering it out of the car in the first place.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Nanocom(V8 only)

  9. #9
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    Where did you get the seals kit from?
    Martin

    The secret to happiness is to truly want what you already have
    Oil leak?...Nah, sophisticated anti corrosion system!


    ‘04 D2a TD5 Manual “Snowy” – Daily
    ‘04 Def 90 TD5 "Hue" – New toy
    ‘03 Def 90 TD5 – Son's toy
    ‘16.5 D4 TDV6 – Gone




  10. #10
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    RE: O ring on D2 power steering pump pipes.

    I can confirm that there appear to be "O" rings on both pipes into the pump, having just had to remove my pump after it started leaking from connection where bottom pipe meets pump.
    Both pipes into the pump had O ring seals.
    Pump is on D2a and pretty certain the pump is original (until now).



    Quote Originally Posted by Max Headroom 2.3m View Post
    Apologies for the long post and I have hunted the forum but as far as I could find, this doesn’t crack a mention anywhere.
    I have a power steering fluid leak in my 2004 Disco 2a TD5 that appears to be coming from either the front PAS pump shaft seal or the union where the high pressure hose screws into the side of the PAS pump outlet. I can’t pinpoint the leak despite having cleaned down several times. Each time I find oil blown around that area and a drip hanging as can be seen in the photo which is of the underside of the PAS pump with front direction at the bottom of the photo.
    PAS Leak.jpg
    It is not the end of the world but it is annoying having an oil leak as it is so uncharacteristic for a Land Rover ........



    With an oil film visible ahead of the high pressure hose union this would suggest the pump shaft seal is leaking but I would have thought that is unlikely as the PAS pump was replaced with a new genuine LR pump 1 ˝ years ago and has done less than 6000km. It was fitted by a LR Stealer workshop and cost the previous owner a bomb (I have the receipts). If it is the shaft seal, can this be replaced or am I up for another new pump?

    The other potential leak candidate could be the high pressure PAS hose union where it screws into the pump outlet. Microcat indicates an O-ring seal P/N QYX100260 located where the high pressure pipe screws into the PAS pump and would seem a likely leak path if this is damaged during installation or is missing.
    PAS O-Ring QYX100260 V2.JPG

    However this is not mentioned in the Rave Workshop Manual which only mentions an O-ring located under the low pressure inlet adapter pipe. With no significant oil leaking when the car is stationary, this would suggest that the low pressure inlet connection is not the source of the leak. Rave PAS pump removal and refit is as follows:

    Remove
    1. Remove auxiliary drive belt.
    2. Remove 3 bolts securing PAS pump pulley and remove pulley.
    3. Position tray to catch spillage, release PAS pump pressure pipe.
    4. Remove clip and release PAS pump inlet hose.
    5. Remove 4 bolts and remove PAS pump.
    6. Remove bolt, and remove mounting bracket from PAS pump.
    7. Remove 2 bolts, remove low pressure adapter pipe and discard 'O' ring.


    PAS Adaptor Pipe.png (Note this diagram is upside down)
    Refit
    1. Clean PAS pump and adaptor pipe.
    2. Fit new 'O' ring to adaptor pipe, fit pipe and tighten bolts to 10 Nm.
    3. Position mounting bracket to PAS pump, fit but do not tighten bolt.
    4. Position PAS pump and align pump drive to coolant pump. Fit and tighten bolts to 25 Nm.
    5. Tighten mounting plate bolt to 25 Nm.
    6. Clean PAS pump and pipe union.
    7. Fit and tighten PAS pump pressure pipe to 20 Nm.
    8. Fit PAS pump inlet hose and secure with clip.

    As can be seen, no mention of said O-ring on the high pressure pipe as shown in Microcat. Any gurus out there able to shed light on this please?

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