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Question
how long should you idle the turbo diesel engine before shutting it down?
That depends on what the engine maker says in the owners manual. In my Detroit engined motor home, I figure that by the time that I get parked it is long enough. That is unless I have just rolled in off the highway into a road side rest area. Then I give it a minute or so. The thing that you want to happen is for the turbo impeller to stop turning before you shut the engine down and stop oil flow. Some will tell you that they want some of the high heat created by exhaust flowing through the turbo so that oil will not coke (turn to diamond like grit) in the turbo bearing. Check the owners manual.
Brad
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Answers by Expert:
Brad Sears
Expertise
All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.
Experience
Automotive tech instructor.
Syndicated auto columnist 1970's though the early 1990's.
Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's
TV Show "Last Chance Garage" 1980's PBS-TV syndicated.
Auto instructor for the following companies:
Fram
Autolyte
Holly
Carter
AMF
Ford Motor
University Of Conn
Blue Hills Technical School
Sugar River Technical Center
Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.
Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.
Education/Credentials
More than I care to remember.
Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.
Awards and Honors
Moto Award winner. And much more.
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