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Thread: Picked up my XJR this evening

  1. #21
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    Quote Originally Posted by Andy K View Post
    Water pumps on early ones were a problem.
    Yes but only in 96 and 97 the early plastic blades degraded and snapped off, certainly not the cause of a leak. I would be very surprised if this had not been replaced with the later polymer bladed one.

    Most likely cause of leak is a poorly fitted pipe, they can work loose after replacement. Failed seals on water pumps are easily seen. Assuming they used the later head gasket from the 4.2 and the head wasn't warped another leak is unlikely.
    1998 XKR Convertible, 2004 S-type V8 SE

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  3. #22
    Junior Member Jimothy's Avatar
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    My suspicion is that either the seal on the expansion tank cap has worn and isn't sealing properly, or as P700DEE said, one of the previously replaced pipes has come loose. Someone mentioned that the pipes on the expansion tank should be crossed, does anyone have a photo of how their's is so I can compare it to mine? I wonder if it hasn't been fitted back in correctly at some point.
    ____________________________________________
    2000 Jaguar XJR Pacific Blue
    Donor car to pay for mid life crisis - 2012 Vauxhall Insignia Elite Nav

  4. #23
    Member ericjansen's Avatar
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    As per picture on this S/C.

    Click image for larger version. 

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    1989 Jaguar XJS 5.3L Convertible
    1998 Jaguar XJ8 4L Vanden Plas

  5. #24
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    Could it be the infamous octopus hose?

  6. #25
    Junior Member Jimothy's Avatar
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    Quote Originally Posted by ericjansen View Post
    As per picture on this S/C.
    Thanks for the photo, here's what mine is plumbed in like. Would this be the cause? I assume the pipe heading off down the wing is to the other tank. I wonder if this is where all my coolant is disappearing to? Should I just swap the pipes round and see if it improves things?

    Click image for larger version. 

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    ____________________________________________
    2000 Jaguar XJR Pacific Blue
    Donor car to pay for mid life crisis - 2012 Vauxhall Insignia Elite Nav

  7. #26
    Junior Member Jimothy's Avatar
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    How do I remove the pipes, I just had a try and I didn't want to break anything. Do you need a special tool?
    ____________________________________________
    2000 Jaguar XJR Pacific Blue
    Donor car to pay for mid life crisis - 2012 Vauxhall Insignia Elite Nav

  8. #27
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    Quote Originally Posted by Jimothy View Post
    How do I remove the pipes, I just had a try and I didn't want to break anything. Do you need a special tool?
    There is a tool. I don't have one and use thin long nosed pliers. Those pipes can be very brittle with age but the good news is they aren't too expensive.
    2 bikes, 2 cars, too little time to do them all justice. Yet.

    2000 XJ8 3.2 exec in Cardinal Red and Oatmeal. 119,000 miles

  9. #28
    Senior Member Andy K's Avatar
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    they aren't the correct way round.

    try the pipe closest to you first.
    Try:

    Pushing towards the tank a little.
    squeezing either side (the bit of plastic should flex)
    And then pulling off.

    If it don't want to come, don't force it.
    XJR 2001 Pacific Blue
    Range Rover Sport 2005 Red 2.7 TD

  10. #29
    Member ericjansen's Avatar
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    Quote Originally Posted by Jimothy View Post
    I assume the pipe heading off down the wing is to the other tank. I wonder if this is where all my coolant is disappearing to? Should I just swap the pipes round and see if it improves things?
    Well, you prove again to never rule out anything, glad you found at least one.
    If I was you I should still change that cap as a prevention.

    And yes, that other hose goes to the wing tank, which is a non-pressurized tank to hold the expanded coolant till it is partly sucked back in.
    It has a hole half way up the tank to overflow if it is full, and I presume yours just vented coolant while driving, hence no pool under the car.

    Just to be sure, not easy to check, but necessary, check if that tank is not cracked, cause then there is nothing to be sucked back ...
    It should have at least a couple of inches of coolant in it while cold.
    1989 Jaguar XJS 5.3L Convertible
    1998 Jaguar XJ8 4L Vanden Plas

  11. #30
    Junior Member Jimothy's Avatar
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    Quote Originally Posted by ericjansen View Post
    Well, you prove again to never rule out anything, glad you found at least one.
    If I was you I should still change that cap as a prevention.

    And yes, that other hose goes to the wing tank, which is a non-pressurized tank to hold the expanded coolant till it is partly sucked back in.
    It has a hole half way up the tank to overflow if it is full, and I presume yours just vented coolant while driving, hence no pool under the car.

    Just to be sure, not easy to check, but necessary, check if that tank is not cracked, cause then there is nothing to be sucked back ...
    It should have at least a couple of inches of coolant in it while cold.
    Thanks, I'm going to attempt to swap the pipes round on my lunch break, and will have a look under the car at the overflow tank to see if it has any coolant in it.
    ____________________________________________
    2000 Jaguar XJR Pacific Blue
    Donor car to pay for mid life crisis - 2012 Vauxhall Insignia Elite Nav

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