I think two things are being confused.
1. turbochargers should no be shut off while still very hot and rotating rapidly, as it is likely to cause the oil in the bearings to overheat and cause bearing damage. This is why "turbo timers" were invented to idle the engine for perhaps 30 seconds after you turn the key off. In practice there should be no problem if the last thirty seconds to a minute of driving has been at small throttle openings, which, when you think about it, is the normal situation.
2. All diesels will glaze the bores if idled or operated at small throttle openings for very long, but we are talking here about times longer than a few of minutes, not half a minute, and the susceptibility of engines varies. Although few do it, it is good practice to shut off the engine when stopped in traffic, and certainly staying parked for extended periods with no load except the aircon is not a good idea, although it is often done.
So whether it is a good or reprehensible paractice to run the engine after stopping, really depends on how long we are talking about. There is no need to idle the engine on startup longer than is required for oil to get to everywhere, perhaps ten seconds after the oil light goes out. Full power should be avoided if possible until the temperature is up to normal, but it is best to drive off as soon as the oil light is out.
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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Originally Posted by Four Boar
Hi guys,,
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