When I removed my Alternator I removed the 2 bolts that held it to the Block and took the Alternator out with the Bracket still on the Alternator.

I did that because not realize the 17mm Bolt needed to be loosened and it was the only way I fitured to remove it.

If the skinny threaded part of the Tensioner is busted off you can replace it at over $40 each or find another way to tension the Belts and hold the Alternator in place while you lock down the 17mm Nut.

If you decide to replace the Tensioner Bolt but are unable to use to origiona Tensioner Nut (I have not seen any part places selling the correct nuts) you can do as this guy in the other Forum did.
He used 1 regular nut, 1 self locking Nylock type nut and a washer (he bought a new Tensioner Bolt).

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84 300D, 82 Volvo 244Gl Diesel