Even if no one is listening loctite in the threads also keeps it from rusting.

This is not a recommendation but I have never used a torque wrench on an Alternator Shaft Nut.
If you go to an autoparts store for a rebuilt alternator they use an impact wrench to get the shaft nut off and swap the pulley and Nut to the rebuilt alternator and the Nut again is installed with an impact wrench. Rebuilt Alternators often come with a new self locking Nut.

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84 300D, 82 Volvo 244Gl Diesel