Welp, Did the coolant pressure test... - Ford Powerstroke Diesel Forum
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Old 01-25-2014, 02:56 PM
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Welp, Did the coolant pressure test...

I ended up with a 60psi gauge after visiting 4 stores it's the smallest PSI I could find in stock...

I made it with 8ft of 3/8" hose, a 3way T and a few fittings to make the gauge adapt to 3/8". Overall about 34.00.



I ran 3 test with engine warm and pressure released. Then flooring the engine up a steep grade.

All three trips my gauge hit about 8-10psi, when I let off at the top of the grade and to slow down before getting a ticket, it would quickly jump to 10-12.

The pressure was staying at 10-12 until I romped on it again and even on level surface, quickly bounced to 16...

Each time, it stayed at 16 until I released the pressure at the cap, I even heard gurgling once while releasing pressure.

So I was surprised that getting up the steep hill flooring it, it did not jump to 16, but I did eventually get the gauge to quickly hit 16... So I guess this confirms HG leak. I was in stock tune and notice some puking just running 30 mile round trip to get supplies for this...

EOT Hit 199, ECT 193




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Last edited by TxOutlaw; 01-26-2014 at 06:37 AM.
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Old 01-25-2014, 03:56 PM
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so you have been loosing coolant lately?

also where have you been filling the degas bottle to? it should NOT be at the full line or most will puke under extreme loads.

when my HG were bad it would puke going 80mph during WOT runs and I would hit 20psi and build pressure really fast... if your holding 16 psi it sounds good to me man. how much did it puke the time you noticed it?
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Old 01-25-2014, 04:05 PM
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I have been puking just a bit when I really push the truck or have extreme street tune on. Not a huge mess at all.

I keep it just under the min line and have a new cap. I have been using 50/50 coolant mix but not sure what the previous owner had in it but he had it flushed about 30k ago. I may flush again and put ELC in.

Would the system not climb over 16 due to the cap releasing pressure?

Thanks for the help!


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Old 01-25-2014, 04:11 PM
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Yes the cap releases pressure at 16psi, I can get mine up to 17 but not with the stock tune. Coolant pressure should be directly related to Temp NOT boost or engine load. If you still have and EGR it could be leaking but you have a leak somewhere. My truck is doing the exact same thing. I just pulled a 7 percent grade and my psi jumped to 12 with the stock file loaded.
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Old 01-25-2014, 04:18 PM
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do you have a monitor to check your engine coolant temp, vs engine oil temp difference?
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Old 01-25-2014, 04:22 PM
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Quote:
Originally Posted by TxOutlaw View Post
......EOT Hit 199, ECT 193......
From his original post
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Old 01-25-2014, 04:27 PM
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Quote:
Originally Posted by JustinOOO9 View Post
when my HG were bad it would puke going 80mph during WOT runs and I would hit 20psi and build pressure really fast... if your holding 16 psi it sounds good to me man.
Me too.


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Old 01-25-2014, 04:27 PM
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Sounds like what my 05 Ex was doing. System pressure would be about 10-12 PSI and as soon as I started building boost the gauge would spike to 16-17 PSI. When the shop pulled the heads the passenger head gasket was just starting to let loose. Got lucky no damage to heads. Now she is studded and completely bullet proofed.
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Old 01-25-2014, 04:28 PM
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Are you slowly building up to 16, or is it shooting right to 16? This is the difference...
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Old 01-25-2014, 04:34 PM
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Quote:
Originally Posted by NYC F-350 View Post
Are you slowly building up to 16, or is it shooting right to 16? This is the difference...
With the coolant pressure released at operating temps just pulling a hill it should not get to 16 psi. If its directly related to cylinder pressure it would have to be a head gasket or EGR.

Last edited by mcdaniel1991; 01-25-2014 at 04:39 PM.
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