Engine temps?
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Junior User
Joined: Feb 2011
Posts: 68
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Like Joe (CSIPSD) mentioned. Coking oil is the concern. The temperature of the oil is only partially significant. The idea is not to shut the engine off when the turbo is really hot. If the turbo is really hot when you shut it down the heat transfer on the shaft and bearings will heat the oil coating them (which is no longer flowing). This can lead to coking. The newer oils do not have problems with this like in the past. Coking is basically like cooking the oil with hot parts. If the part is really hot, it will breakdown the oil and sear it on the parts.
Here is a good explanation: Coking Oil, Coking Oil 2
Due to the wheelbase on my truck I usually back into most spots. I have found that the time it takes to stop, throw it in reverse and park is plenty of time to get the temps down to under 400*. Unless you pull a long hill, then shut it off at the top, you will most likely not ever see a problem.
Here is a picture from an OBS Turbo I rebuilt. There is a slight amount of coking on the area closest to the turbine wheel. Beyond that there was little to no signs of coking at all. So you are pretty safe in just shutting it off.
Here is a good explanation: Coking Oil, Coking Oil 2
Due to the wheelbase on my truck I usually back into most spots. I have found that the time it takes to stop, throw it in reverse and park is plenty of time to get the temps down to under 400*. Unless you pull a long hill, then shut it off at the top, you will most likely not ever see a problem.
Here is a picture from an OBS Turbo I rebuilt. There is a slight amount of coking on the area closest to the turbine wheel. Beyond that there was little to no signs of coking at all. So you are pretty safe in just shutting it off.
Elder User
Joined: Dec 2006
Posts: 718
Likes: 2
From: Chattanooga, TN
Something I noticed while watching my Edge CTS engine monitor this week while on a trip to Shreveport, LA was that my EOT was running approx. 130 deg. higher than ambient temperatures and my TFT was approx. 30 - 40 deg. lower than the EOT.
That was very consistent on both legs of the trip. I was not pulling/hauling anything.
Interesting.
That was very consistent on both legs of the trip. I was not pulling/hauling anything.
Interesting.
Elder User
Joined: Feb 2006
Posts: 547
Likes: 0
From: Tennessee
Ok, so I replaced my water pump, t-stat, housing, hoses, belt and added coolant filtration. Went from stock (I think) to the 203 stat. Oh yeah, changed to the red Prestone HD ELC. I have an Edge Insight and added a coolant sensor to see the actual temp. Is it normal for the coolant and oil temps. to be nearly the same? The other day it was about 40F and both temps were running 195 to 205. Even when driving 'easy' on the way home from work the oil was around 200 when I got home, and leaving it idle for 5 min. doesn't really drop the temp. much. I was under the impression that's a little high for the turbo when you shut the engine off? I'm not sure exactly how the fan clutch works either, but I've noticed that the fan is spinning all the time, is it only supposed to spin at high temps? I bring that up, b/c I was wondering if it is bad or was damaged when I changed the water pump? Any insight would be greatly appreciated. Thanks all!
The last two long-range camping trips I've taken towing my travel trailer have both been with ambient air temp right around 100* while towing, and my engine oil and coolant temps run about 215-218 on average, and as high as 220 or so when I'm pulling uphill or something. I hope some others on here see the same temps- seems a bit high to me, but on the other hand, if you stop and idle for a bit, like at red lights, etc, the temps go down pretty quickly-
Any of you other guys see those kind of temps towing?
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