Join Date: Oct 2013
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OK Guys, Thanks for the valuable advice.
On my '05 E350 with 6.0 and 78K miles, I installed a coolant filtration system & installed a Scan Gauge II. These are the initial readings:
-At idle, ECT = 184, EOT = 188, FICM = 47.5/48
-In stop and go traffic (zero to 60, 60 to zero, lot of lights), ECT = 189, EOT = 197, FICM = 48
-Highway driving, 2300 RPM sustatined, approx. 75 mph, ECT = 191, EOT climbed to 15 degree delta at 206 degrees, FICM = 48, then I slowed down to lower the ECT/EOT delta, and.....
-Highway driving, 2000 RPM sustained, approx. 62 mph, ECT = 190, EOT = 202, FICM = 48.
OK, I'm a diesel newbie but generally knowledgable, to my inexperienced eye, I'm thinking the Oil Cooler is ready for replacement, along with the EGR cooler. I have researched tell tale signs of needing head gaskets/head studs, and I don't see any indication I need them (yet). Since this is an Econoline, to install head studs, and then reinstall heads, it seems like the motor would have to come out, which I don't want to do unnecessarily.
I'm hoping you guys will agree the Oil Cooler, EGR cooler (and everything else that I can replace without pulling the motor for head studs) is the ticket. I'm looking forward to your advice. Thanks, Gene