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Location:
Perth
Registered:
October 2003
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1JZ radiator pressure cap
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Mon, 09 February 2004 00:13
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What is the pressure rating on the radiator cap for a standard 1JZ considering they run a little hotter than most engines? I ask cause I cant keep any water in my overflow bottle, as soon as i fill it and drive the car it always empties and pisses out everywhere. I have a 16 psi one.
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Location:
I wanna go Hawaiiiiii.......
Registered:
November 2003
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 01:51
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I have a trd (hehe what a load of shit) 1.3 bar rad cap. Never had a problem with heat or dropping coolant.
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Location:
c'town, NSW
Registered:
May 2002
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 02:13
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cant say for sure but i think most toyos run water at 19psi.
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Location:
Sydney
Registered:
March 2003
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 02:46
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on the JZA70 supras
Stock rad cap is rated to 14.9psi before it will open.
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Location:
Perth
Registered:
October 2003
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 04:56
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What do you think might be causing the overflow to spew out water all the time? By the way im not losing radiator water, just the water i put in the overflow bottle.
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Location:
Sydney
Registered:
March 2003
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 05:30
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Have you burped the cooling system properly?
Air in the system can/will force the fluid in the overflow bottle to spill out, as can the system being pressurised (blown head gasket).
Check the simple things first, radiator cap, thermostat and make sure the cooling system is free of air.
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Location:
Perth
Registered:
October 2003
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 06:58
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How do you burp the system properly? Im sure ive read this before, but i searched and found nothing 
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Location:
Brisbane
Registered:
May 2002
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 08:32
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Obvious question: are you actually filling your overflow bottle, like all the way to the top? If you do this the bottle will definitely overflow...
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Location:
Perth
Registered:
October 2003
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 09:31
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No, only halfway, must be getting a fair bit of pressure in there. The bottle can be completely emptied.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 11:03
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| Skip wrote on Mon, 09 February 2004 14:58 |
How do you burp the system properly? Im sure ive read this before, but i searched and found nothing
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I've always found the best way is to idle with the cap off with the front of the car on ramps or the like. Let it sit there till the water at the top of the radiator stops bubbling (i.e. all the air has escaped)
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Registered:
June 2002
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 20:16
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I've had the same problem Skip.
I have a swirl pot between the top hose and the radiator inlet, this has the radiator cap on it.
If I fill this up (as you'd expect it to be) it spits out to the overflow bottle, I've given up on filling it up and just leave it now, it is usually 1/2 empty (cold) and this allows the over flow bottle to be full.
That all sounds a bit messy doesn't it.
Basically, I can't fill the cooling system up as much as I thought I should be able to, when I do it overflows!!
I'm running a 1.1bar rad cap
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Location:
Perth
Registered:
October 2003
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Re: 1JZ radiator pressure cap
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Mon, 09 February 2004 23:39
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justcallmefrank: Thanks for the advise, ive idled the car with the cap off alot on the flat, but never with the front of the car raised. Will try tonight. 
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