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John Deere Tractors Discussion Forum
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4020D blows out coolant

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Jon (IN)

08-02-2005 04:48:42




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After brush hogging with my '66 4020D, it will blow coolant out the radiator. It blows very little while the tractor is running, but when you shut her down, it blows quite a bit out. Temp Gauge stays straight up at Normal, but I am a bit concerned that she is getting too hot. Any thoughts?




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donmyeil

08-02-2005 11:03:23




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 Re: 4020D blows out coolant in reply to Jon (IN), 08-02-2005 04:48:42  
Sounds like a blown head gasket to me.



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Jon (IN)

08-02-2005 11:10:44




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 Re: 4020D blows out coolant in reply to donmyeil, 08-02-2005 11:03:23  
Man, I hope not..... It doesn't really blow out until I shut it off. That's when it comes out. Blown head gasket would push it out while running, wouldn't it? Otherwise, the tractor runs good and has good power.



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David Sherman

08-02-2005 22:01:45




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 Re: 4020D blows out coolant in reply to Jon (IN), 08-02-2005 11:10:44  
I agree. Blown head gasket will blow the most while under the heaviest load. Every cooling system will build pressure immediately after shutdown since the fan and water pump stop running but there's still lots of heat in the block. Depending on where the temp sender is located, it might not be sensing it. Could be as simple as a bad radiator cap? I'm still trying to track down an overheating problem on my 2010, but it's overheating under load, like you'd expect.

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Mark57_420

08-02-2005 10:25:06




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 Re: 4020D blows out coolant in reply to Jon (IN), 08-02-2005 04:48:42  
Is it literally blowing out the cap, or just down the overflow? If it"s just leaking down the overflow, are you sure you"re just not keeping the radiator too full? I did that a while back when I was trying to sell my late father"s old 4020, not thinking that these things didn"t have an overflow reservoir on them.



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Jon (IN)

08-02-2005 10:57:49




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 Re: 4020D blows out coolant in reply to Mark57_420, 08-02-2005 10:25:06  
Too Full??? Maybe.. Are they not supposed to be full? Yes, I think it is just coming out the overflow and after it cools down and I open the cap, it's probably 1 - 2 gallons shy of full. That just doesn't seem right to me, which makes me leary to run it 1- 2 gallons shy. I will check the temp gauge to make sure it's accurate to ease my mind a little. I've only had this tractor since spring and just not starting to work it a little, so I rather be over cautious.

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Mark57_420

08-02-2005 12:10:45




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 Re: 4020D blows out coolant in reply to Jon (IN), 08-02-2005 10:57:49  
I like the idea the earlier poster had of a new cap. That would probably help out quite a bit too. It seems like I added almost 2 gallons to my old 4020 to cause it to overflow. I just happened to check it before I put it up for sale and I couldn"t even see the antifreeze. I never ran it hard so I don"t know if it was getting hot or not. I ran it on the road for about 15 minutes on the way to garage with it "low" and it did fine. I would assume that my father had run it like this under full load in the field though and he never said anything about it running hot when we were talking about selling it.

I wouldn"t think the temp gauge would be inaccurate, but I"ve never had one fail on a tractor either, so I don"t know for sure. I would think they would just completely open up and you would either get no reading or a full scale reading all the time. Does it read cold when the tractor is cold and come up as it warms up? If so, I"d think it would be safe to assume it"s working close enough to normal.

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buickanddeere

08-02-2005 05:18:56




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 Re: 4020D blows out coolant in reply to Jon (IN), 08-02-2005 04:48:42  
Are you idling the engine for a couple of minutes after heavy work before shutting her down? If you have several hundred pounds of metal at 200 to 1300 F and a couple of gallons of coolant already at 180F. Guess what is going to happen when the fan & pump quit turning. The heat removal from the coolant has nearly stopped but the heat input is continuing. Odds are the coolant isn't 50/50 mix of antifreeze and distilled water that's less than two years olod either. The rad cap is likely 39 years old with a weak spring and tired gasket. Low system pressure allows low temp boiling. Have you tested the temp gauge sender in a pot of water at a rolling boil? Any scale, slime or mud in the cooling system anywhere?

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Jon (IN)

08-02-2005 07:50:54




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 Re: 4020D blows out coolant in reply to buickanddeere, 08-02-2005 05:18:56  
I normally do let her idle down a few minutes before shutting it off, probably more of a habit from running turboed machines. No, I don't know what the mix of coolant is, and it's probably not less than 2 years old, but I don't know of too many folks who do replace their coolant every 2 years, especially on a utility tractor. I will check the cap and I have a couple of good temp gauges lying around that I will try in her as well.

Thanks for the suggestions.

Jon

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