Quote:
Originally Posted by killer205
Mine was just before the facelift
But from looking I will need to remove a few things from the top so I can get into the space where it is.
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Agreed - the manual states you'll need to remove the fan and fan shroud, then the v-belt. Remove the idler pulley (see image R11 1520 in link below). You can then remove one of the alternator bolts, slacken the other (image R11 1519 in link below), tilt the alternator out of the way (top will rotate toward the left) exposing access to the rear of the tensioner.
BMW Workshop Manuals > X Series E53 X5 3.0d (M57) OFFRD > 2 Repair Instructions > 11 Engine (M57) > 28 V-ribbed Belt W.tens.-deflect.elemt > 2 RA Removing And Installing Alternator Drive Belt (M57 _ M47TU)
Worst part will be removing the fan but I guess you've "been there - done that" if you have recently replaced the water pump.