Zetor 7340 / John Deere 2400 specs please

Discussion in 'Machinery' started by MB Trac, Jan 7, 2019.

  1. Mursal

    Mursal Member

    Had you rain overnight, was it outside?
    Don't rule out the cooler completely, if unsure can you bypass (join the coolant pipes) to test?
     
  2. MB Trac

    MB Trac Member

    Location:
    South Africa
    No rain overnight, definitely came from the radiator through the block into sump. Disconnected the water pipes to cooler and tried to blow in one pipe while holding the other closed, no air leaking out anywhere. We thought of every other possibility, but nothing makes sense.
     
  3. Mursal

    Mursal Member

    And it leaked after you took the heads off, so it wasn't the other gaskets.
    Unless you wanted to drain the block and throw a bit of diesel in, in our experience it will find a leak better than water.

    A leak like that would do your head in ..........
     
  4. agrimax

    agrimax Member

    Location:
    Co Down
    Would the old gaskets be temporarily reusable,including the blown one? If you lightly coat both block and heads with something like a cheap silicon mastic and together with the old gaskets,bolt the heads back on again Just a light smear of sealant so as not to have any go into the oil or waterways..If you can't get a proper pressure tester,you could make up something with a foot pump or turn the pressure away down from a compressor and air line. Just don't exceed 12-15 psi.You don't want to burst the radiator! I think a pressure test is your only way forward now.
     
  5. MB Trac

    MB Trac Member

    Location:
    South Africa
    IMG_20190112_094438.jpg IMG_20190112_094414.jpg Okay, so we put the old gaskets and heads back and pressurized it - found the leak. It was one of the o-rings. Took everything apart, knocked sleeve out. One of the o-rings is broken, but there is a lot of pitting around where the o-ring sits. Can it still be used like this?
     
    davidroberts30 likes this.
  6. mikep

    mikep Member

    For £50? no.
     
  7. davidroberts30

    Location:
    pembrokeshire
  8. MB Trac

    MB Trac Member

    Location:
    South Africa
    I haven't priced a new one from the local Deere dealer yet. But it'll take another week to get here probably. Neighbor has same tractor that they overhauled engine recently, going to see if I can't use one of his old sleeves. Should probably replace all of them, plan is to put new rings and bearings in it then as well. Just don't have the funds to do it right now.
     
  9. Sharpy

    Sharpy Member

    Location:
    Ardrossan Ayrshire
    Could the liner have been moving up and down very slightly with the slack head bolts, causing the o ring to fail?
     
    celtis man likes this.
  10. MB Trac

    MB Trac Member

    Location:
    South Africa
    Lots of rust, thinking some rust got behind o-ring and broke it
     
    Sharpy likes this.
  11. davidroberts30

    Location:
    pembrokeshire
    dont worry about rings and bearings if its not knocking or breathing
    get the liner of your neighbour but you will sometime need to do the rest
     
  12. MB Trac

    MB Trac Member

    Location:
    South Africa
    The plan is to do the rest, just depends how soon I need the tractor. Have ordered the o-rings for the rest anyway.
     
  13. davidroberts30

    Location:
    pembrokeshire
    thing is its had no antifreeze/inhibitor in it thats why its rusty
    the other 3 liners will look the same

    could you get that 1 sandblasted clean to inspect it?
     
  14. MB Trac

    MB Trac Member

    Location:
    South Africa
    Probably poor quality water in it too. I'm sure they all will look like this one.
    The liner doesn't look too bad overall, just that one place where the o-ring sits that bothers me. I'm worried it will not seal properly and leak again. Could I chance putting a little silicone there?
     
  15. Mursal

    Mursal Member

    Great you found the problem .........
    Is that a crack in the O ring groove?

    Stay away from the John Deere dealers and go Zetor, at least half the price for the same parts.
    Good secondhand liner, get you going quick or take your time and do a proper job, while you have it stripped?
    Did you consider pulling the other liners out for inspection, easy for me to say?
     
    Sharpy likes this.
  16. davidroberts30

    Location:
    pembrokeshire
    Do you know anyone sh!t hot at welding,preferably TIG?
    They could build it up quietly and dress it back for now as temporary fix
     
  17. MB Trac

    MB Trac Member

    Location:
    South Africa
    Unfortunately no Zetor dealers in South Africa, I'm probably lucky JD even carry parts for these. When you ask the JD dealer mechanics for advice they tell you they don't have any books on these anymore, try one of the other branches.
    I'll see what I can come up with at the neighbors parts, if I'm lucky he may be able to help. If not, I'll see what other plan I'm able to make.
     
    Mursal and davidroberts30 like this.
  18. Mursal

    Mursal Member

    What about the rings, would you not be afraid of the cylinder going oval with the heat?
     
  19. davidroberts30

    Location:
    pembrokeshire
    Hence low amp tig and a good welder;)
     
  20. Mursal

    Mursal Member

    Are we welding it or silver soldering / brazing it?
    The lower temps might just work .............
    Just might be a tad hard to start :cool:

    Some lads on a budget (and for themselves) would try liquid steel.
    I hear a lot talking about building up the block with it (first O ring gone porous only) with good success?
    And no heat involved ............
     

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