What temp is overheat on a 6.0?

[DELTAJOHN]

I was towing our 8K Lb Travel Trailer back from Cape Hatteras yesterday, my truck was towing well, maintaining 7-8 degree deltas during the uphill pulls.

When I reached Afton mountain on RT 64 and started pulling that long hard grade I kept the truck running 2500 RPMS, about 25 lbs boost, and a steady 60mph, my temperature kept rising until 226 degrees (oil temp was about 8 degrees hotter) then my Edge Insight CTS sounded an alarm, and the temp began blinking. I believe my cooling fan kicked on because I heard a whine in the engine noise, the ECT went no hotter than 226 and cooled down when I crested the hill. My question is, at what temp should I shut down? The idiot gauge in the dash still indicated in the middle!

I checked my engine later, all was fine, no puking, everything OK. My EGR cooler is long gone.

[colo_dually]

An ECT of 226 is fine, the fan wont come on until 220*, under stock programming.
Defueling won't start until EOT reaches 254*.

Your Insight must have the factory defaults still for alarm set points, you can adjust those to your comfort level. I set my ECT alarm point at 230* and EOT at 245*, before they are actually an issue.

[DELTAJOHN]

So what I'm getting here is EOT, (which is always hotter when warmed up) will back down the engine well before ECT would overheat/boil over (in an engine with good headgaskets)

[Country Mav]

Subscribed- I like to learn all that I can about safe temps and parameters! I've been wondering this myself!

[colo_dually]

Originally Posted by DELTAJOHN

So what I'm getting here is EOT, (which is always hotter when warmed up) will back down the engine well before ECT would overheat/boil over (in an engine with good headgaskets)

Not entirely, where as an EOT of 254* will result in defuling, you don't want to push the truck to those levels if it can be avoided. If you have a monitor, you can keep an eye on both, and adjust your driving accordingly. ECT doesn't overheat as much on these trucks, unless you have a clogged cooler, because the t-stat fails open. Overheating on a 6.0L will often cause the whistle from the degas bottle, which could also be a sign of EGR cooler failure.

[jetjock15]

ive gotten my truck hot. The stock dash temp guage is tied to ECT only, it runs up to 3/4 mark at 240 ECT and redline at 248 ECT, those are from observed readings of the temps real time, not the manual or anything. my EOT has been 260 before. You are fine

[ZMANN]

I Have seen some 240's while towing in the Death valley ,,

but my EOT ECT was in range ,, the newest flash will reduce power on a 6.0 if the delta between the two splits past a predetermined level