Do you leave your diesel running ...?
I see many diesel drivers who leave the engine running while fueling (or other short-term occasions). For a while, I asked why they did that, just to see what their reason was. Never got the same answ...
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Just a little more detail on my previous post. A turbo charger can spin at over 100,000 rpm and get pretty hot - well over 1000 degrees F. Engine oil carries the heat away from the turbo and lubricates it. If you shut the engine off after a long, hard pull, the turbo is still spinning and it's still very hot. The oil in the turbo can break down and shorten the life of the bearings.
There's also an EGR cooler on some trucks. Exhaust gas is cooled and then injected back into the combustion chambers to reduce emissions when the engine is pulling hard. The cooling is done by circulating engine coolant through a cooler similar to a radiator. The EGR can get well over 1000 degrees. When you abruptly shut off the engine, the coolant stops flowing and boils off. It can cause the cooler to melt and allow coolant to enter the combustion chamber. At best you'll loose coolant and blow white smoke. At worst, the engine will hydro-lock and seize up. Either way, it's expensive to repair and easy to avoid.
There's also an EGR cooler on some trucks. Exhaust gas is cooled and then injected back into the combustion chambers to reduce emissions when the engine is pulling hard. The cooling is done by circulating engine coolant through a cooler similar to a radiator. The EGR can get well over 1000 degrees. When you abruptly shut off the engine, the coolant stops flowing and boils off. It can cause the cooler to melt and allow coolant to enter the combustion chamber. At best you'll loose coolant and blow white smoke. At worst, the engine will hydro-lock and seize up. Either way, it's expensive to repair and easy to avoid.
