Coolant Pressure
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Senior User
Joined: Mar 2007
Posts: 295
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From: Debary FL.
Coolant Pressure
I have been having a small amount of coolant blowing out the cap and today I was able to do a pressure test. While driving down the highway it gets up to 14-15 psi and stays there. Running the srl tune with studs and the hated black onyx gaskets. Was wondering if this was normal operating pressure or do I have the start of a gasket leak?
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
You are right there at max pressure. Cap is rated at 16psi. Might try a new cap. Check sealing surface on bottle. I think most trucks stay around 7-9psi so you have somthing going on.
Cargo Master
Joined: Oct 2005
Posts: 2,599
Likes: 2
From: Farmington NM
Depending on your alt, coolant brand, and temp that pressure is OK.
Caps are 10 bucks at autozone, clean the bottle and replace the cap. that may help.
If you can test the system pressure under heavy load that is what you are looking for.
Caps are 10 bucks at autozone, clean the bottle and replace the cap. that may help.
If you can test the system pressure under heavy load that is what you are looking for.
Mountain Pass
Joined: Jul 2006
Posts: 224
Likes: 1
Sounds like a HG going, I had this condition and just replaced both heads due to small dents in the heads mech. didn't feel comfortable machining out -too deep.
No cross fluid contamination, minor puking and Tea Kettle.
Good Luck, YMMV.
Denny
No cross fluid contamination, minor puking and Tea Kettle.
Good Luck, YMMV.
Denny
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Senior User
Joined: Mar 2007
Posts: 295
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From: Debary FL.
Yeah I did replace the cap recently but hasn't helped. So it should be around 7-9 cruising down the road. Also should the pressure come down after getting on it?
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Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Well, recent posts have referred to the cap being rated at 16psi but I found this statement in the tech folder "Degas cap rated for 12 - 18 psig. Over 18 psig indicates possible headgasket leak." so it looks like there's some tolerance. As you likely know, the BO gaskets seem to have a higher failure rate than the factory gaskets. Might try backing off the tunes and re checking. It depends on how long you stay in it but generally the pressure will go up when you romp on it and will continue to increase for a short while after you get off it and then decrease slowly.
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