Safe EGT for engine shutdown.
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Joined: Nov 2004
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Originally Posted by arninetyes
Okay, here is how it has been explained to me by a mech engineer....
The diesel engine doesn't need to be cooled off very much, the turbo (whether gas or diesel) REALLY needs to be cooled off (and the engine will cool more than required in the time it takes the turbo to cool down). Because the turbo has engine oil in it, if you shut the engine down after it has been working hard, the oil left in the HOT turbo can cook and coke up. Then, the turbo bearings don't spin or get lubed properly because they are coated with coked up, partially solidified oil. Then the bearings burn up - bye, bye turbo.
I'm not sure how that correlates to EGT - especially pre-turbo EGT. I do know that the owner's manual recommends letting the engine run for about 10 minutes after hard working before shut down.
I'd really be interested in seeing some kind of study that correlates EGT to turbo temperature, and when if we can look at EGT to know for certain when it is safe to shut off.
The diesel engine doesn't need to be cooled off very much, the turbo (whether gas or diesel) REALLY needs to be cooled off (and the engine will cool more than required in the time it takes the turbo to cool down). Because the turbo has engine oil in it, if you shut the engine down after it has been working hard, the oil left in the HOT turbo can cook and coke up. Then, the turbo bearings don't spin or get lubed properly because they are coated with coked up, partially solidified oil. Then the bearings burn up - bye, bye turbo.
I'm not sure how that correlates to EGT - especially pre-turbo EGT. I do know that the owner's manual recommends letting the engine run for about 10 minutes after hard working before shut down.
I'd really be interested in seeing some kind of study that correlates EGT to turbo temperature, and when if we can look at EGT to know for certain when it is safe to shut off.
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