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  1. #1
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    Default Breather on diffs

    So often i do long gravel roads with 4x4 high and occasionally needs to go throught a water crossing.
    I know the diff oil gets warm and should it go through cold water it might suck in water.
    Anybody have knowledge of one way breather connections on a Gen 4 Jimny?
    Johan

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  2. #2
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    Default Re: Breather on diffs

    I must say, my old 2003 Isuzu has its diff pipe breather connected into my fuel tank filler pipe.
    Isuzu STD 2.5d 2x4 rear diffy lock
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  3. #3
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    Default Re: Breather on diffs

    Quote Originally Posted by Coetzee Kuilsrivier View Post
    So often i do long gravel roads with 4x4 high and occasionally needs to go throught a water crossing.
    I know the diff oil gets warm and should it go through cold water it might suck in water.
    Anybody have knowledge of one way breather connections on a Gen 4 Jimny?
    I don't think you want a one way valve as the pressure drop on suction can be extreme and will just suck water in through the seals. Much better to just extend the diff breathers to somewhere higher like a snorkel.
    Better still to just avoid the water if it is not essential to wade through it.

  4. #4
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    Default Re: Breather on diffs

    One-way valve is definitely not the answer.

    Either an extended breather with it's end higher up than the water level (which by the sound of it you may already have), or a little bellows is the answer.

    Make sure you have similar solutions for both diffs as well as the transfer case and gearbox (if it's a manual gearbox).
    Beat-up rat rod of a '96 Nissan Patrol that bears the evidence of many wonderful adventures (and a few stupid indiscretions).

  5. #5
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    Default Re: Breather on diffs

    Quote Originally Posted by Peter Connan View Post
    One-way valve is definitely not the answer.

    Either an extended breather with it's end higher up than the water level (which by the sound of it you may already have), or a little bellows is the answer.

    Make sure you have similar solutions for both diffs as well as the transfer case and gearbox (if it's a manual gearbox).
    The old Suuz has extended breathers on diff and gearbox - just extended pipe lengths - never had a problem with this.
    Simple & effective.
    Peter Hutchison
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  6. #6
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    Default Re: Breather on diffs

    Quote Originally Posted by Peter1949 View Post
    The old Suuz has extended breathers on diff and gearbox - just extended pipe lengths - never had a problem with this.
    Simple & effective.
    Peter I traced my rear diff breather (4x2) and see it goes into my fuel tank filler pipe. My concern is, what happens on a full tank, won't it suck fuel back into diff when diff is hot then cools.
    Isuzu STD 2.5d 2x4 rear diffy lock
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  7. #7
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    Default Re: Breather on diffs

    Quote Originally Posted by hunter26 View Post
    Peter I traced my rear diff breather (4x2) and see it goes into my fuel tank filler pipe. My concern is, what happens on a full tank, won't it suck fuel back into diff when diff is hot then cools.
    Not sure but depends where in the pipe it connects I guess.
    If very high and entering from the top of the pipe maybe ok?
    Mine are just extensions upwards not connected into any other pipe.
    Obviously not in the worst dust prone places.
    Never given trouble, never had water in diff or gearbox, so must be OK.
    Plenty of water crossings over time but never much deeper than above hubs excepting maybe very briefly or from a bow-wave.
    I have always avoided water crossings when practical because in the places we have done them it is usually not exactly safe to walk the crossing.
    So I tend to rely on seeing recent tracks going in and OUT on the other side or otherwise not being the first vehicle in a group crossing.

    Avoided any disasters ....
    Peter Hutchison
    Answering the call of the wild is just so much beter than answering the telephone.
    [B][SIZE=2][FONT=Calibri][SIZE=2][B]ISUZU KB 280 DT LE
    Modified Glider Hunter trailer fitted with RTT.
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