coolant system pressure
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Mountain Pass
Joined: Mar 2012
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coolant system pressure
I just did a pressure check on the cooling system on my 04 6 liter. It reached 16lbs towing an enclosed trailer and into a strong head wind. I was just wondering what's the Normal pressure suppose to be, or is there a Normal pressure. I'm using the new style cap with the larger spring in it and it didn't kick any coolant out.
Thanks for the help
Thanks for the help
Laughing Gas
Joined: Oct 2012
Posts: 794
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From: Ontario
I just did a pressure check on the cooling system on my 04 6 liter. It reached 16lbs towing an enclosed trailer and into a strong head wind. I was just wondering what's the Normal pressure suppose to be, or is there a Normal pressure. I'm using the new style cap with the larger spring in it and it didn't kick any coolant out.
Thanks for the help
Thanks for the help
Certified Thread Hijacker
Joined: Aug 2001
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The harder the engine works and the more heat it creates the higher the coolant pressure.
3-5 psi is a good rule of thumb for simple driving conditions, ECT 190-198 or so.
Working it hard will see higher pressures, over 200 ECT under load it isn't unreasonable to see 8-12 psi.
Over 12-14 psi is an indication of an issue IMHO.
Josh
3-5 psi is a good rule of thumb for simple driving conditions, ECT 190-198 or so.
Working it hard will see higher pressures, over 200 ECT under load it isn't unreasonable to see 8-12 psi.
Over 12-14 psi is an indication of an issue IMHO.
Josh
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Mountain Pass
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I plan on taking the truck cross country in a month so I figured I better check a few things, I'm doing a coolant flush and thermostat change shortly. Then I'll use the scan gauge at the same time as when I'm doing the pressure recheck. May even try a different gauge, just to verify that its working properly.
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Head Gasket Issue?
After your truck is up to temperature and the pressure is up ,carefully vent the coolant pressure. Then drive your truck hard, you should be at or around zero. If your pressure rises you may have a bad head gasket. I see up to 16-18 psi, but im using extreme tuning. You could pressurize the system cold and it should hold 15 pi for at least 1 minute.
After your truck is up to temperature and the pressure is up ,carefully vent the coolant pressure. Then drive your truck hard, you should be at or around zero. If your pressure rises you may have a bad head gasket. I see up to 16-18 psi, but im using extreme tuning. You could pressurize the system cold and it should hold 15 pi for at least 1 minute.