How long should one let their 6.7L Diesel cool down at idle. I let mine get down to 392 degrees on the pyro temp. plus another minute. What is recommended?

 

In the past I would always wait until EGT was <400. Now I just cut it off. Unless I was towing something or driving hard right before I got to my destination, I don't worry about it.

 

There is no factory recommendation. Why do you let it cool? I understand the theories being applied to past behaviors but as with just about everything from waxing to changing oil, there are some assumptions that don't precisely fit reality.

 

My 6.0 I had a pyro, would wait until below 400 f. It rarely took more than a minute after stopping even if pulling and uphill right before a fuel stop, by the time I pulled in, fan shuts down, EGT is below 400 from less than a minute idle time. I would not worry about it, as long as your fan is not screaming on high and coolant temps are coming down, transmission temps are reasonable I would say your EGTs are fine. Even if towing heavy, as long as everything is working right, really don’t think you have much to worry about. If all these temps are still concerning high, a few minutes of idle will bring everything back down fairly quickly.

 

Towing heavy, I use the remote start with the duration set to 5 mins. Get out of the truck shutoff, then remote start really quick and it shuts off after 5 mins. Usually brings the oil temps down close to/under 200°.

 

I wait until the engine oil temp is below 205° F. My understanding is that what we're trying to make sure is cool, is the turbo.

 

When ever I watch my temp for cool down time the temp always goes up...probally becuase a vehicle not moving is not really cooling system efficient.

 

Per the Ford Owner's Manual; under the section on Starting/Stopping the Engine;

SWITCHING OFF THE ENGINE - 6.7L DIESEL
Switch the ignition off.
To help prolong engine life, we recommended you allow the engine to idle for three to five minutes, especially after any of the following:

• Continuous engine speed.
• High ambient temperature.
• High GVW or GCW operation, for example heavy loads or trailers.

This allows the turbo charged engine to cool down.




http://www.fordservicecontent.com/Fo...userMarket=USA

 

Not correct, see thread #8.

 

I wait for the oil temperature to get 198 degrees or under. If pulling heavy that can take several minutes.

 

I let it cool few minutes when normal driving n longer after towing..but there has been times during normal driving I just shut it down because I forget.

 

What about shutting down during regen? That's really the only time I feel like I'm doing any "damage". EGT's through the roof but you have no choice sometimes...

 

If I have to stop in the middle of a regen, I put it in Park and let it idle for a couple minutes.

 

I use my CTS2 to monitor egt's and it doesn't display below 392 , so I let it idle until it reaches that and shutdown .

 

Like the poster above, I also use a CTS2, and monitor EGT1 (at the turbo). I generally let it come down to 400 before shutting off, but when empty, that amounts to park and shut it off. Coming off the interstate, after hours of running 70, a coasting down typical off ramp, is enough to drop to the low 400, then a block or two to a fuel station gets me down to nearly that 400 mark.

When towing the travel trailer, I find that by the time I have it backed into a site, or parked at home, temps are good to go.

As was said above, the biggest concern is when you reach your destination with an active regen in process. For these, I do as that mentioned. Put it in park (this will cancel the regen), then let it idle until the EGT1 comes back down.