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Yes, the rear half of the case can be "clocked" to any of 4 positions with NO internal mods. 1.) Remove all 4 case bolts. 2.) SLIGHTLY separate the case halves ONLY ENOUGH so they can be rotated with respect to each other. The stator laminations, visible in the gap between the 2 case halves, MUST stay with the back half of the alternator, as there are leads from the windings in the laminations to the rectifier bridge in the back half of the alternator. If you separate the halves any more, one or both of the brushes will drop off of the slip rings, and break when the case is forced back together. If a brush drops out of place, pull the alternator completely apart, find a 2" length of "mechanic's wire", make sure the brush springs are in the brushholder, then insert the brushes, one at a time, and hold them down while inserting the wire through the hole in the back of the case that lines up with the holes for this purpose in the brushholder. The wire holds the brushes safely retracted while you reassemble the alternator. Then, carefully withdraw the wire out of the back of the alternator, BEFORE attempting to use it. (Before putting the alternator back together, wipe any dirt and grease off of the rotor shaft. Carefully clean any dirt and grease away from the periphery of the rear case bearing, so it doesn't get pushed into the bearing by the rotor shaft. If the needle bearing looks dry, put a TINY amount of high-temp wheel bearing grease in it before reassembly.) 3.) Reinstall the 4 case bolts, and snug them up evenly.
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