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My following statement applies only to turbo charger function. The source of the noise you descibe may not be turbo charger related at, but may be low cranking oil presssure related.
Turbochargers are driven by a constant stream of very hot exhaust gases. They are not equipped with conventional ball or roller bearings because the hot gases would boil the oil and cook the bearings. Instead they use bushings similar to cam bearings, which are not really bearings at all, but spacers. The oil is the bearing. It is recommended that you idle and engine for several minutes after high speed boost operation to enable the oil supply to cool the turbocharger, which is something hardly anyone knows of or follows. It is this quick hot shut off that boils the oil in the turbocharger. When you intiate the following operating cycle, the bearing dry starts and actually rotates dry for a few seconds. Over time, it become loose because it has lost it's calibration due to run dry friction. The solution is to ignore it. There is a new turbocharger somewhere in your future.
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