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  1. #1
    Member gatordog's Avatar
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    1980 MF 280, 1979 IH 684

    Default Cold start issues? on a International 684

    Just got the 684 with a nice Rhino Loader today, and it is tricky to start. The fuel needs to be set just right and it turns over for awhile and then starts, and when cold it will die. Then just re-start and it will run if you just let it idle. While it is warming up it blows blueish smoke (incomplete fuel burn). Once it warms up the smoke goes away and it starts just fine and the throttle is responsive. The dealer said it had low power, do to low compression and that might be true. Once warm and even when cold the motor runs smooth and even. I am now thinking timing, but don't know. I still need to run compression, but I have never ran compression by removing the injectors, with my truck engines you just remove the glow plugs. The other problem is the injectors look like they are pressed in and held in with a bracket. I still need a service book, since this tractor is ruff and needs to be completely rewired, lots of body work, and paint.

  2. #2
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    Default Re: Cold start issues? on a International 684

    Hi, as an ex IH co sve manager I know your unit well!!!

    You state it is bad to start when cold, from your description I would categorise the issue as poor running when cold.

    To start, the fuel stop lever must be set about 1/2 way between stop & run, if you look on the pump there is a spring capsule which the stop lever on the pump should be against for the excess fuel starting position.

    Then secondly the throttle should be set at about 1/2 full speed position.

    Thirdly there is a thermostart heater mounted in the inlet manifold and fed by a pipe from the injectors and fuel pump. To use the thermostart turn on the ign switch then turn key firther(against spring pressure) and hold in this position for 45 seconds, then move key to start position and crank over engine, and it should start.

    The blueish exhaust smoke when idling when cold is due to some low compression and burning oil.
    The low compression and oil burn is probably due to bore & ring glazing. Because as you state it's o/k when hot. 4 hours on a dealer dynamometer at full power would do it a world of good.

    I am fairly confident that timing is not an issue here!!

    What hours has she done ??, .& what grade and specification of oil do you use ??, also what do you use tractor for and how frequently.

    The injectors are easy to remove, they are held down by a claw bracket, remove bolt & bracket, and fuel pipes and they should lift out, but may be held in by dirt between the injector and the copper sleeve it sit in , sealing is by a taper at bottom of injector body sealing on copper injector sleeve, sleeve is pressed and glued into head and should not move !!!
    Last edited by cyrush; 09-22-2012 at 03:09 PM. Reason: Xxxxxxxx

  3. #3
    Member gatordog's Avatar
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    1980 MF 280, 1979 IH 684

    Default Re: Cold start issues? on a International 684

    This tractor has been re-wired and most of those wires have been cut. I did adjust the timing from 6 degrees to 16 degrees, and it runs better, but is still hard to start when cold. I have been starting with the fuel cut off all the way on. I don't see that thermostat heater thing, and when you turn the key the starter runs when you push the clutch and will not shut off until you turn the key off. It looks like I need a new wiring harness or make my own. I don't have a separate ign switch and starter? One new problem, this machine has a Rhino loader and the hydraulic power from the remotes to the loader keeps kicking off when I try and lift the tractor with the loader. The lever on the right side pops up, and to reset I have to pull lever up to back feed the loader and then back down. Can I adjust this cut off pressure, or just use the hold down to keep the arm down? I need to drain some fluid out since the fluid level on the dipstick is way over full.

    I still need to check compression, but nobody has the adaptor for this tractor. Do you know were I can buy one, dealer is clueless.


    Will try the fuel shut off at 1/2 and the throttle also at 1/2 to see if that helps.

  4. #4
    Member gatordog's Avatar
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    1980 MF 280, 1979 IH 684

    Default Re: Cold start issues? on a International 684

    Sorry, I did not answer your questions

    Don't know about the hours, that is not working.

    What type of oil should I use?? I was going to run Rotella or should I go with a straight weight.

    I was going to use the Tractor for clearing some brush and use the loader to move material. Was planning to add some other attachments, but I have a Massey 230 that is in better condition. Might sell the IH if I can not get the loader to work better, or remove the loader and mount on something like a JD 3020 or Ford of same size, since I can get parts and advice from the ford and JD dealers.

  5. #5
    Platinum Member
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    South Carolina

    Default Re: Cold start issues? on a International 684

    I think the 684 only uses ether as a starting aid.
    IHC 424 Diesel
    Ford 917 Flail Mower

  6. #6
    Member gatordog's Avatar
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    1980 MF 280, 1979 IH 684

    Default Re: Cold start issues? on a International 684

    Yes that is true, I am going to install a tank heater to heat the coolant

  7. #7
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    Default Re: Cold start issues? on a International 684

    Gator dog !! Reading another thread I gather you have a 784 not a 684, so it will have the D246 engine.

    Timing for the fuel pump should be 16degrees for both applications.

    Tractors for Europe were fitted with the " thermostart" flame start device in the inlet manifold, for North America the ether start was preferred ??

    Re oil I need to know the "American Petroleum Institute" API classification grade of the oil you suggest so I can better advise?

    Re compression tester, any good dealer should have a universal tool which can be used or you could use a dummy injector???

    It would also be useful to know if you are using a high or low sulphur diesel ???

    Where abouts are you located???
    Last edited by cyrush; 09-27-2012 at 05:23 PM. Reason: Xxxxx

  8. #8
    art
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    Default Re: Cold start issues? on a International 684

    I would venture a guess that the tractor might have had a valve job. We have had several come into the shop that had used other make head gaskets that are thicker causing a compression loss. We removed the after-market ones and put in the factory correct steel shim gasket and everything was good!!!

  9. #9
    Silver Member
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    Default Re: Cold start issues? on a International 684

    " Art's" comment about too thick a gasket is very valid if unit has been overhauled.???

    Now the loader operation, I presume the loader has its own bank of valves which are being fed by one of the tractors auxiliary valves.

    The correct way of doing this should be to use a " high pressure carry over" HPCO to supply pressure oil to loader, bypassing the tractor valves,

    Alternatively with the set up you have the stop gates on the aux valve lever (as shown in operators manual) can be modified to hold valve lever in demand so it does not kick out.

    The detents on the valve levers are hydro-mechanical in operation and are best left alone. If the valve is left on demand against adead end you will overheat the hydraulic system, best way would be to fit the HPCO.!!!

  10. #10
    Member gatordog's Avatar
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    1980 MF 280, 1979 IH 684

    Default Re: Cold start issues? on a International 684

    Looks like I need a HPCO, It's going be fun trying to find one of those

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