Turbo questions-diesel

[Chilla]

evenin all

Have read through the wiki section on diesel turbo but have a couple of questions as follows-

1. when the compressor and turbine are together how freely should the rotors spin? ie should they spin on there own or with a little resistance.

2. On the compressor housing, where the oil feed enters the unit there are 2 other threaded ports which on my unit are open ie there is no bung/bolt in the holes and the threads have become corroded. Is this right ?
thanks in advance

[andysimpson]

1. Should rotate very easilly, have slight play.

2. sounds like you have a water cooed turbo, maybe of a gtd, does nor matter its not connected.

[Chilla]

thanks Andy !