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Cooling system pressurising when engine its turned off 

 

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 Post subject: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:04 pm 
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Hey guys, sounds like a headgasket to me, anyone have any other reasons why the above could be happening?

Thanks in advance
Matt

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:13 pm 
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U mean its gaining pressure when u switch it of? This usually happens because when u switch it off, the water in the block boils because circulation has stopped when the water pump turns off with the engine.. U will notice your temp gauge always goes up when u switch it of after a drive, then start up it will go down instantly..
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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:17 pm 
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Yeah that is whats happening, but it pressurises so much it flows like a litre out of the overflow, which isnt cool :)

So is there a good fix for this?

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:30 pm 
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Tried a known good radiator cap ??
When you release the radiator cap when cold, is there pressure still in the system ??

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:31 pm 
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Love these double posts.

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:34 pm 
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Yeah it has a brand new cap, hours later the system is still pressurised :) even when cold.
Like a freaky amount of pressure, lol :)

Thanks for the help so far

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:41 pm 
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Sounds like combustion gasses are getting into the cooling system - probably under a firing ring. Most likely there's no evidence of external leaks. You'll probably find your oil is fine.
If you pop the cap before the first start of the day, and pressure is present, then it's most likely.
You can get a sniff test on the coolant, which will prove this if necessary.

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:45 pm 
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Is that a piston ring? Time for a new engine if it is :P

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 10:55 pm 
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sounds like rad cap to me...

you should get greater pressure when running if its the HG leaking...

get a mech to check with a TeeKay tester...looks for co2 in your coolant

any bubbles in the bottle when running?

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 11:04 pm 
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gogetta wrote:
sounds like rad cap to me...

you should get greater pressure when running if its the HG leaking...

get a mech to check with a TeeKay tester...looks for co2 in your coolant

any bubbles in the bottle when running?


Hmm, would it be unwise to just spend a day fixing the HG without getting the co2 test done?

Cos if its a ring that would require taking the whole f'ing thing apart :)

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Tue Jun 16, 2009 11:07 pm 
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Yes this is what happening to my step sisters EF Wagon. Overflow is empty. Engine cold. BUT, huge back pressure when releasing the radiator cap, with instant spurt of coolant from down below somewhere. But I cannot find any external leaks anywhere!
I can't figure out where it's all going?
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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Wed Jun 17, 2009 12:13 am 
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gasman the firing ring is part of the HG not the piston rings....

its a solid days work at least to do the HG (dont bother posting that it took u 3hours,u know who u r heroes)
+ gaskets, bolts and machining $$$$...

do some more detective work 1st

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Wed Jun 17, 2009 6:45 pm 
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my ea will store pressure for weeks, it has a new radiator cap, radiator, thermostat and hoses.
the only strange thing it does is runs real (bout 75%) hot on the first cycle till the thermostat opens then it's fine. i contribute this to a blocked bypass tube (the pipe that runs from the thermostat housing to the water pump) no headgasket leak and i actually have an intermittant leak from a welsh plug under the exhaust. still holds pressure.

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Thu Jun 18, 2009 2:13 pm 
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My EF Fairmont had the same problem

The pressure would be so great it would spit the coolant out of the overflow tube - it did it for a while then just stopped doing it.

But then it started leaking out of the Radiator - replaced that
But then it started leaking out of the heater hose - replaced that
But then it started leaking out of the Heater Radiator - replaced that

After all holes were fixed it Started leaking out of the overflow tube AGAIN Arrrrrrrg !!!

Took the radiator cap off while the car was running and it would spurt out everything out of the overflow and more - did the same test with mates car and no where near as bad as the pressure in my car

Went on the Dyno and then this:-
Image

Get the car back this week so I will update thread and advise if I am still having the pressure issue

I presume the failing Heater, Heater Radiator and Radiator was all due to the increase pressure - yeah they will go in time but having that muhc pressure IMO made then blow sooner - fatigue

 

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 Post subject: Re: Cooling system pressurising when engine its turned off
Posted: Thu Jun 18, 2009 3:23 pm 
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-GAS-MAN- wrote:
Hey guys, sounds like a headgasket to me, anyone have any other reasons why the above could be happening?

Thanks in advance
Matt


Try borrowing/stealing an Engine Compression Tester.

Remove all spark plugs, then screw in compression tester (1 cylinder at a time), crank engine over with the ignition key for 5 seconds and read what's on the guage.

All readings from each cylinder should be within 10% of each other. If not you've got problems.
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