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ford 6600

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kleine39kermit

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blowing water out of overflow pipe. Without radiator cap inplace all seems normal. Runs at 160 degrees and water circulating at all rpm's But when under load like plowing after about 30-45 minutes it starts blowing a lot of coolant out of the overflow pipe. Would a leaking head gasket cause this under a load. No water in oil or anywhere else. Under no load all is normal. Any ideas?
 
Well it should not be filled completely to the top of the neck is my first guess-since
it only does it under a load. When the coolant gets hot, it expands and will run out
the overflow if no room in the tank. Does the temperature stay normal when it blows
coolant? Does it stop leaking after it loses some coolant? Mark.
 
Two questions. How long have you had this tractor?
And how full do you fill the rad? Seems all newer
equipment comes with an overflow tank, but older
stuff didn’t. If you are filling it to the cap, there is no
room for any expansion, would be my thought. A
bad head gasket, or if this is a sleeved engine, a
sleeve with a hole in it can pressurize the coolant
system, and blow your coolant out for sure. I have
an older tractor that will run coolant out the
overflow, if I fill it to the neck, but if I just fill it till the
core is well covered, it never has an issue. And that
is why I asked how long you have had this tractor.
Is this something that has just developed?
 
My 5000 will push out the overflow if I fill the radiator. If I just cover the top of the core and leave the top tank empty it does not spit up. I
run a 200 degree thermostat in my Fords, as recommended by my Ford mechanic.
 
ahd this tractoer for over 25 yrs. This just stared doing this. I fill the radiator to about 1" below the neck. With out the radiator cap (7lb) it runs normal temp 160 degrees But under a load it still runs normal but after 30-45 mins. it startsrunning the coolant out the over flow into the recovery tank. have had to refill with about a gallon coolant. It has done this twice.
(quoted from post at 10:31:59 06/25/20) Two questions. How long have you had this tractor?
And how full do you fill the rad? Seems all newer
equipment comes with an overflow tank, but older
stuff didn t. If you are filling it to the cap, there is no
room for any expansion, would be my thought. A
bad head gasket, or if this is a sleeved engine, a
sleeve with a hole in it can pressurize the coolant
system, and blow your coolant out for sure. I have
an older tractor that will run coolant out the
overflow, if I fill it to the neck, but if I just fill it till the
core is well covered, it never has an issue. And that
is why I asked how long you have had this tractor.
Is this something that has just developed?
Click to expand...
 
That is a symptom of a head gasket or pin hole in a liner.

Has it ever been overheated? Typically a head gasket starts with an initial overheating. If it is a head gasket it will eventually get worse, start showing up as coolant in the oil, misfire, loss of power, exhaust steam on a warm day, mystery coolant loss.

As long as there are no other symptoms, and you are the only operator, might run it a while, keep close watch on it, see what develops.
 
[It has never overheated that I know of. Don't use the tractor much any more so if I can plow with it until it starts to do this I'll park it and take a break until the next day. quote="Steve@Advance"](quoted from post at 11:26:38 06/25/20) That is a symptom of a head gasket or pin hole in a liner.

Has it ever been overheated? Typically a head gasket starts with an initial overheating. If it is a head gasket it will eventually get worse, start showing up as coolant in the oil, misfire, loss of power, exhaust steam on a warm day, mystery coolant loss.

As long as there are no other symptoms, and you are the only operator, might run it a while, keep close watch on it, see what develops.[/quote]
 
try a new radiator cap. I had one that would do the same thing when the cap got hot it lost all pressure and would boil over.
 
I dont know about the 6600, but I do know about the 6610, its predecessor... It MUST have a thermostat with a tail disk or it will overheat under load. As the thermostat opens, the tail piece closes off the bypass hose. Otherwise a normal thermostat will run fine till you load it, and then it will over heat.

https://www.external_link/products/ford-new-holland-6610-tractor-thermostat-87803664.html
 
Pull the injectors and put a pressure check on the radiator. Let it set a little while with pressure on it, crank it over and the
water will come out the injector hole where the leak is. These series Fords very rarely blow head gaskets, holes in blocks, yes,
break crankshafts, yes. Could be the thermostat, radiator cap or plugged radiator inside or outside.
 
Acording to tractor data you have that backwards. The 6600 was built from 75-81 and the 6610 was built 82-93 so the 6610 followed the 6600 and not preceded it.
 
Thanks for your response. Plowed with the tractor yesterday for about an hour and it did spew out collant during that time. The coolant level is abut 1 1/2 iches from the top when cool and the temp. ran in the normal range. But the out dooe temp. was a little cooler (85)
better than the mid to high 90's on the other days which shouldn't have made any difference.



t
(quoted from post at 10:30:30 06/25/20) Well it should not be filled completely to the top of the neck is my first guess-since
it only does it under a load. When the coolant gets hot, it expands and will run out
the overflow if no room in the tank. Does the temperature stay normal when it blows
coolant? Does it stop leaking after it loses some coolant? Mark.
Click to expand...
 
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