Blown Head Gasket? - Diesel Forum - TheDieselStop.com
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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 11-20-2012, 03:57 PM   #1 (permalink)
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Blown Head Gasket?

Hi guys. I know this thread has been beat to death and I really did check the "search" button and learned plenty about the blowing cold air when the cabin air is selected to full hot...

My question is "How do you know if you have a blown head gasket when your truck is performing flawlessly and you aren't losing any coolant?"

I replaced the thermostat and flushed and filled the radiator with new coolant and now it acts kind of like it wants to blow hot, but it goes back to blowing ambient air.
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Old 11-20-2012, 05:21 PM   #2 (permalink)
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Best way is to tee in a pressure gauge into the small line going to the degas tank and monitor the pressure.

The system is designed to run 16psig max. Above that, the cap will release excess pressure. Normally, you'll run from 8-12 psig of coolant pressure and it will be pretty stable once warmed up. If you have a blown head gasket, you'll build pressure pretty quickly (15+ psig) and it will swing up and down with pedal position.
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