As the title states, 2006 F250 with 101K has some upsetting test results. Truck had studs when I purchased it but had the EGR still so I deleted that plus the other "must haves" such as new oil cooler, coolant filter, EC-1 ELC coolant. No issues at all. She runs hard and runs well.
I found the original pressure gauge with hose and T fitting that I used to test it when I purchased it 6 months ago in the garage today. Just for shiggles, I installed it to see what the results are and wouldn't you know it... the coolant pressure creeps up with boost. In a 55-90mph pull I can increase the coolant pressure by 2-3psi. Seems to stop around 13-15ish but will fall to 10-12 in time. No burping and no coolant loss.
Here's more detail...
Coolant started at 184 degrees and 0 psi.
Driving normal in town 190 degrees and 2-3psi
Normal pace on the interstate 3-4psi
First pull was 30psi in OD at 1800rpm. Jumped to 6psi
Did it again and repeated the results 6psi-8psi
WOT shifting through gears would jump roughly another 2psi every time until 15psi.
This was over a 30 minute duration.
With that, I'm reasonably sure I'll need to do head gaskets and am looking closely for other symptoms to show (but haven't yet). If those with more experience than I could offer their 2 cents worth, I can probably come up with a solid game plan.
Option A- Take it to Monticello Ford. They seem to go above and beyond to keep a Ford customer from purchasing a Dodge or Chevy. I believe they have a machine shop verify specs on new heads, also. This will cost me the most, I believe.
Option B- Do it myself in the driveway. I've rebuilt many high performance gas engines but not a diesel. Who do you recommend for cylinder head service? I assume costs would be head work, new gaskets, and probably new studs (or are studs reusable?)
Thanks guys. Can't wait to tell the wife!