Not only does it allow it to cool down but slow down and it allows the cooling system to pull heat out of the head. When you run up stop and shut down that turbo is wizzing , not as hard as when under load and it is spinning on a film of oil . Remove the oil pressure to soon and the bears will take hit . Maybe it will not affect them all at once but over time they will ware and then the seals start to go due to sloppy bearings . also when you just shut down combustion chamber temps rise and the coolant flow is not there to pull the excess heat out . My one friend is on his SECOND turbo on his Dodge because he thinks it is like a gas engine . Fire it up allow no warm up and out the lane and down the road full tilt , get to where your going pull in and shut down as your walking away from the truck you can hear the turbo spooling down . Years back while working in the oil patch i ran a 750 Deere dozer and a 450 C ,Both had what i thought was a extream high engine idle , the 450 was up around 950 and the 750 was over a 1000 RPM . Even letting them set and cool down for 10-15 min while you cleaned tracks when you shut them down you could still hear the turbo spinning for 15- 20 seconds after the engine was shut down thru the mufflers.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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