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Thread: GU TD42 twin oil filters.

  1. #1
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    GU TD42 twin oil filters.

    I'm trying to help my son with his 2003 GU Patrol which did a head gasket. That's fine, but the car is converted from the 3.0l hand grenade to a TD42, probably from a GQ. This engine runs twin oil filters. Fine, not a bad idea. However, when I came to remove the filters ( head gasket, you change this stuff, right? ), the rear filter was empty, and showed no sign of oil ever being in it. The front filter was as you'd expect. Does anybody have Nissan experience and could tell me what's going on?

    I don't like mysteries when it comes to engines.
    ​JayTee

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    2000 D2 TD5 Auto: Tins
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    Nanocom, D2 TD5 only.

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    That's really odd, although it may just be the anti drain back valve not holding and the oil has drained back to the sump.
    This used to happen all the time to the TD42's and TD42T's I serviced, and pretty common in general for standard nitrile ADBV's to not hold.

    There were two versions of the twin filter setup.
    One ran two full flow filters, the other ran one full flow and one combination filter, which is part full flow and part bypass (ie. a high efficiency, low micron element) in the one can.
    The fitting for that one is a different size and style to the full flow filter fitting.

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    Quote Originally Posted by rick130 View Post
    That's really odd, although it may just be the anti drain back valve not holding and the oil has drained back to the sump.
    This used to happen all the time to the TD42's and TD42T's I serviced, and pretty common in general for standard nitrile ADBV's to not hold.

    There were two versions of the twin filter setup.
    One ran two full flow filters, the other ran one full flow and one combination filter, which is part full flow and part bypass (ie. a high efficiency, low micron element) in the one can.
    The fitting for that one is a different size and style to the full flow filter fitting.

    Thanks. Both filters are Z115s. The strange thing to me is that the rear filter seems to have never seen oil, although I haven't actually dissected it.
    ​JayTee

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    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

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    I had a GQ TD42 for twelve years and on every oil change both identical filters were full of oil.

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    Quote Originally Posted by jbe View Post
    I had a GQ TD42 for twelve years and on every oil change both identical filters were full of oil.
    Which is what I'd expect.., and why I asked. I was perplexed.

    Perhaps there's a blockage somewhere. OP seems fine, but I don't know what they usually run. Maybe I should remove the filter housing.
    ​JayTee

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    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  6. #6
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    The Donaldson I mostly used wouldn't hold, it'd always drain back past the ADBV and so the filter had nothing in it when spun off.
    Genuine would hold fine.

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    Quote Originally Posted by rick130 View Post
    The Donaldson I mostly used wouldn't hold, it'd always drain back past the ADBV and so the filter had nothing in it when spun off.
    Genuine would hold fine.
    Hmm. The ones fitted were Ryco. So are the new ones. I'll run it and then see.
    ​JayTee

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    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

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    John, from memory the filter pressure relief/bypass valve was in the aluminium housing they screw onto, not the filter, so check to see if that's not stuck open.
    Last edited by rick130; 25th February 2020 at 05:05 PM.

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    Quote Originally Posted by rick130 View Post
    John, from memory the filter pressure relief/bypass valve was in the aluminium housing they screw onto, not the filter, so check to see if that's not stuck open.
    Thanks Rick. Does that mean that the PRV is in the housing as well? I’m asking only for the info.
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  10. #10
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    Quote Originally Posted by johntins View Post
    Thanks Rick. Does that mean that the PRV is in the housing as well? I’m asking only for the info.
    Whoops, reading this on my phone. Not used to that.
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

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