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The fan and alternator seem ok. I know that sound since I have delt with it before. I think this is the turbo because the sound changes with a change in load (as the turbo spins faster). It is not as dependent on RPM as long as the RPMs are up 2500 or so.
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1980 300TD with 1985 300TD Turbo motor and 240D 4 speed.
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