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  1. #1
    Gold Member
    Join Date
    Nov 2012
    Posts
    254
    Location
    Newark, de
    Tractor
    International 424

    Default Running Hot

    Hi all,
    New member here.
    I have an International 424 Gas which I have recored the radiator, new cap, water pump, etc.
    The tractor runs hot as the temp gauge shows 250 260 degrees but when I check the temp
    at the thermostat housing it shows 230 or so. Thermostat is a 170. Possible blockage in block
    or head? Any help appreciated.
    Thanks

  2. #2
    Veteran Member
    Join Date
    May 2005
    Posts
    1,330
    Location
    Balls Creek, NC
    Tractor
    New Holland 1720

    Default Re: Running Hot

    Quote Originally Posted by sox3 View Post
    Hi all,
    New member here.
    I have an International 424 Gas which I have recored the radiator, new cap, water pump, etc.
    The tractor runs hot as the temp gauge shows 250 260 degrees but when I check the temp
    at the thermostat housing it shows 230 or so. Thermostat is a 170. Possible blockage in block
    or head? Any help appreciated.
    Thanks
    Have you checked your thermostat?

  3. #3
    Gold Member
    Join Date
    Nov 2012
    Posts
    254
    Location
    Newark, de
    Tractor
    International 424

    Default Re: Running Hot

    its a new one. 170 degree

  4. #4
    Platinum Member DutchHenryBrown's Avatar
    Join Date
    Aug 2009
    Posts
    879
    Location
    Tombstone, AT
    Tractor
    Mahindra 5010

    Default Re: Running Hot

    Even new thermostats can be bad not often but it happens Maybe gauge is off? Good luck.

  5. #5
    Veteran Member mostly_gas's Avatar
    Join Date
    Sep 2009
    Posts
    2,293
    Location
    Missouri
    Tractor
    in-between tractors

    Default Re: Running Hot

    Check temp of block with non-contact thermometer. If gauge is correct you have either a water flow or an air flow problem. Back wash the radiator fins with engine cold. Start tractor with rad. cap loose and check water flow when engine temp over 180-190F. Show be more water flow than a garden hose would produce. If water flow seems slow look for blockage.

  6. #6
    Gold Member
    Join Date
    Nov 2012
    Posts
    254
    Location
    Newark, de
    Tractor
    International 424

    Default Re: Running Hot

    Quote Originally Posted by mostly_gas View Post
    Check temp of block with non-contact thermometer. If gauge is correct you have either a water flow or an air flow problem. Back wash the radiator fins with engine cold. Start tractor with rad. cap loose and check water flow when engine temp over 180-190F. Show be more water flow than a garden hose would produce. If water flow seems slow look for blockage.
    Radiator has been recored. I check the temp at the thermostat housing with inferred temp gauge and it s
    running 230 or so. Gauge showes 250-260. Fins are clean as core is new, plenty of air flow. How do I go about
    looking for a blockage in the block or head?

  7. #7
    Veteran Member Jerry/MT's Avatar
    Join Date
    Feb 2008
    Posts
    2,058
    Location
    Western Montana
    Tractor
    New Holland TD95D, Ford 4610 & Ferguson TO-30

    Default Re: Running Hot

    Are you sure the water pump belt is tight, the lower hose is not collapsing as the engine speeds up and the pressure cap is the correct rating and is working properly? Make sure the timing is correct and the advance is working correctly. A retarded spark can cause the engine to run hotter. So can too lean a mixture, due to reduced charge cooling.

    If the infra-red shows 230F at the thermostat housing and gauge shows 250-260 and the sending unit is near the thermostat housing I'd susupect the sending unit or the gauge. If you can find a spec on the sending unit you can measure the resistance and see how it compares to the spec. One way to check the gauge is to hold the wire that connects to the sending unit to ground momentarily. The gauge should peg out to max temp. If it does the gauge is good and the sending unit is the problem.

  8. #8
    Gold Member
    Join Date
    Jan 2006
    Posts
    355
    Location
    Stone Mountain, GA
    Tractor
    Case 1210, Mitsubishi D2050

    Default Re: Running Hot

    Regardless of the somewhat innacurate gauge, 230 is too hot. Your water pump could be faulty (worn or rusted up impeller), or have an obstruction in the block. Have you tried a can of cooling system cleaner? You put it in, run it for 30 or so minutes, and then drain/flush the system. If the problem is a chunk of rust clogging up cooling somewhere it will help with that, and will clean out biological crud also. If you are sure about the radiator, and there isn't crud in it, and once you clean the system and check out the water pump, then it's time to take the head of and get it serviced. Servicing should include hot tanking and furnace baking to clean out the water passages, plus whatever needs to be done to service the valves.

  9. #9
    Gold Member
    Join Date
    Nov 2012
    Posts
    254
    Location
    Newark, de
    Tractor
    International 424

    Default Re: Running Hot

    Quote Originally Posted by Jerry/MT View Post
    Are you sure the water pump belt is tight, the lower hose is not collapsing as the engine speeds up and the pressure cap is the correct rating and is working properly? Make sure the timing is correct and the advance is working correctly. A retarded spark can cause the engine to run hotter. So can too lean a mixture, due to reduced charge cooling.

    If the infra-red shows 230F at the thermostat housing and gauge shows 250-260 and the sending unit is near the thermostat housing I'd susupect the sending unit or the gauge. If you can find a spec on the sending unit you can measure the resistance and see how it compares to the spec. One way to check the gauge is to hold the wire that connects to the sending unit to ground momentarily. The gauge should peg out to max temp. If it does the gauge is good and the sending unit is the problem.
    Thanks for the reply, Belt is tight, cap is correct new 7 lb, pump is new, hose not collapsing, sending unit in thermostat housing, havent checked timing
    but will do. I think there is a flow issue in the block. It is boiling at those temps and lifting the cap. I also have the correct amount of antifreeze in it.
    I'm thinking about pulling the freeze plugs and see whats in the block passages. When I replaced the pump I did not see any debris in the upper areas,
    but the old radiator core was severly plugged up.

  10. #10
    Gold Member
    Join Date
    Nov 2012
    Posts
    254
    Location
    Newark, de
    Tractor
    International 424

    Default Re: Running Hot

    Update:
    Pulled 2 freeze plugs, looks good inside block. Today I pulled the head, small
    passages were clogged and I was able to clean them out. Just waiting on
    a new head gasket and see how it does then.

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