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Location:
Castle Hill Sydney Austra...
Registered:
November 2003
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 Help Me Please!
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Tue, 28 September 2004 23:45
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Hey everyone ! as some might already know i have an ea falcon with a 4.0lt lexus v8 in it. I have a sevear cooling problem. this symptoms are when the temp reads half on the dash the overflow tank starts to piss out coolent (its overpressurizing!)
What would cause this over pressurization? could it be a cracked head? it has a triple brass core radiator ( usaally for the ford 5.0lt v8) an inlet and outlet on the same tank of the radiator for duel cooling and twin thermo fans? what else can i do ?    it doesnt show signs of a head gasket or cracked head doesnt blow smoke or condensation no depiosits of water in oil or vice versa so i really dont know what to do
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Location:
Brisbane
Registered:
February 2004
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Re: Help Me Please!
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Tue, 28 September 2004 23:46
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thermostat broken?
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Location:
Castle Hill Sydney Austra...
Registered:
November 2003
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Re: Help Me Please!
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Tue, 28 September 2004 23:47
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Yeah but would that make the tank over pressurize?
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Location:
Land of Oz
Registered:
June 2004
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Re: Help Me Please!
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Wed, 29 September 2004 00:04
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Hi,
What if the thermostat isn't opening all the way?
Can you remove the thermostat fully and see how it goes? Worse case, assuming it is the thermostat, your engine won't get up to temperature fully, but at least it will give you an idea. If it's still over pressuring then we gotta look for something else. Also, while the thermostat is out, put it into a pot of water and heat it up. Use another thermometer to check the temp in the pot to see what temp it is when the thermosat opens. It'll tell you if it's working properly or not, and give you an indication at what temp it is opening - assuming it's working properly.
seeyuzz
river
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Help Me Please!
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Wed, 29 September 2004 02:02
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stupid questions:
are the fans turning on when hot?
have you done a compression test?
by dual cooling, you mean the radiator is in two halves and the water flows first left, then right?
don't get too frustrated.. just work thru the prob methodically 
Cya, Stewart
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I Supported Toymods
Location:
melbourne.vic.au
Registered:
May 2002
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Re: Help Me Please!
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Wed, 29 September 2004 05:55
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| 1B4U18 wrote on Wed, 29 September 2004 09:45 |
Hey everyone ! as some might already know i have an ea falcon with a 4.0lt lexus v8 in it. I have a sevear cooling problem. this symptoms are when the temp reads half on the dash the overflow tank starts to piss out coolent (its overpressurizing!)
What would cause this over pressurization? could it be a cracked head? it has a triple brass core radiator ( usaally for the ford 5.0lt v8) an inlet and outlet on the same tank of the radiator for duel cooling and twin thermo fans? what else can i do ? it doesnt show signs of a head gasket or cracked head doesnt blow smoke or condensation no depiosits of water in oil or vice versa so i really dont know what to do
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I have a similar problem with my MA61, we assume it's the head gasket or a cracked head, I'll find out Monday.
Cheers.
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Location:
cambo
Registered:
May 2002
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Re: Help Me Please!
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Wed, 29 September 2004 11:21
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i would think its a blown head gasket. you can get a tester to see if there are combustion gasses in the coolant and it works good. maybe just take it to a mechanic and tell them you want them to test it like that. not every mech has it but its cheap to get.
MAKE SURE YOR COOLING SYSTEM IS CONNECTED CORRECTLY! when i first put my gze in, it never used to have a thermo so i just ran it inline in the bottom hose. it overheated like crazy cause there was no flow through the cooling system cause there was cold water at the thermo but the water in the head was hot. there MUST be a bypass past the thermostat.
disregard all that if you are SURE the cooling system is connected correctly.
has this problem just occured? or has it always been that way since you put in the new motor?
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Location:
Adelaide
Registered:
August 2004
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Re: Help Me Please!
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Wed, 29 September 2004 12:01
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Another line of thought,
Do you have a thermostat in place??
Without the restriction of the thermostat body the water may actually pass through the radiator too fast, not letting it cool and building up pressure.
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Location:
cambo
Registered:
May 2002
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Re: Help Me Please!
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Wed, 29 September 2004 12:04
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that is possible, ive heard of people saying that, having seen it myself tho.
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: Help Me Please!
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Wed, 29 September 2004 12:24
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| Quote: |
Without the restriction of the thermostat body the water may actually pass through the radiator too fast, not letting it cool and building up pressure.
and
that is possible, ive heard of people saying that, having seen it myself tho.
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This Is NOT True, It has never has been true, and it never will be true!!!!!!! Please do not keep passing on & repeating old wives tales & anecdotal things you don't understand.
an unrestricted flow MAY NOT purge all air bubbles/pockets when refilled, and that air will let that place get very hot & boil.
then any coolant is pushed away, and it gets even hotter.
http://yarchive.net/car/radiator_diagnosis.html
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1B4U18, please change the title of this post to something accurate.
i usually don't even look at those with a whiney baby "help me" let alone answer one.
[Updated on: Wed, 29 September 2004 12:36]
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Location:
Adelaide
Registered:
August 2004
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Re: Help Me Please!
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Wed, 29 September 2004 12:58
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That is funny that this has never been a problem!!!!!
I had a group n mini cooper s that displayed these exact symptoms, after a lot of screwing around and reading motor sport magazines i found an article written by david vissard who has been around engines longer than most people on these forums, explaing this problem.
They actually make a thermostat replacement sleeve to restrict the flow of water through the radiator allowing it to cool corectly.
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Location:
Castle Hill Sydney Austra...
Registered:
November 2003
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Re: Help Me Please!
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Thu, 30 September 2004 06:34
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OKAY i Checked the thermostate today and it was fully open by about 100 Cel i tryed flushing the system but to no evail my mate was saying that if the head was cracked that the pressure could be coming from the piston side of things and be putting pressure in to the cooling system. is this true ? if it was the head is there anything i could do to rectifiy the problem for the mean time ? Cheers
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Location:
cambo
Registered:
May 2002
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Re: Help Me Please!
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Thu, 30 September 2004 06:57
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mate i said that in my post! just because theres no water in the oil or oil in the water doesnt mean theres no combustion pressure in the coolant! answer some of the questions in my 1st post, then i can get a better idea.
allencr: dood, chill out. thanks for the info but if you dont feel the need to help whiney babies then dont!
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Location:
Adelaide
Registered:
August 2004
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Re: Help Me Please!
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Thu, 30 September 2004 08:10
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For a short term fix, try a bottle of cemiweld, you need to follow directions properly to get it to work though.
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Location:
Castle Hill Sydney Austra...
Registered:
November 2003
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Re: Help Me Please!
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Thu, 30 September 2004 10:33
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It Happened about 2 weeks after the motor was in the temp went sky high but as soon as it did i turned the motor off straight away and let the thermos do there job!
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Location:
cambo
Registered:
May 2002
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Re: Help Me Please!
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Thu, 30 September 2004 10:34
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so you had 2 weeks of driving with no troubles?
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Location:
Castle Hill Sydney Austra...
Registered:
November 2003
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Re: Help Me Please!
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Fri, 01 October 2004 04:46
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Yeah no troubles and then one day the temp went sky high!
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Location:
Melbourne
Registered:
October 2003
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Re: Help Me Please!
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Fri, 01 October 2004 07:42
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haha, did you ever think to check the cap??!
If the seal/spring is broken it will allow the coolant to escape
at a much lower pressure than what it should.
also check for air pockets (as mentioned earlier) that will make steam/pressure that will push out your water.. Run the car for a good 15 mins with the cap off to let any air out and refil.
Other than that it could only be headgasket.
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Location:
cambo
Registered:
May 2002
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Re: Help Me Please!
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Sat, 02 October 2004 00:57
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adding to what hemi said: since its a conversion we dont know the height of the radiator is in comparison to the engine so a good idea when you are bleeding the coolant system is to either jack ther front of the car up nice and high, or cut a coke bottles bottom off, wrap tape around the filler neck and stick it in the radiator upside down with a good seal, to ensure the radiators highest point is above that of the highest point of cooling in the engine. removes all possible air leaks.
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