Diagnosis of the 1961 60kva Kamper Generator (plus full throttle run)

Unfortunately its more than a bad set of brushes, its a burnt winding all because somebody got lazy and did not share the single phase load across all 3 phases, instead they overloaded one and it burnt. Fuses should have protected it, but I would bet they were upgraded to the point they were useless.
The question is, can I lift the brushes on the bad winding and use 2 phases to neutral (ground) and still get some use out of it without having it rewound just yet.
The alternator looks to be made by Siemens, but it just does not have any stamps on it to prove it, I have no idea who made it.

Видео Diagnosis of the 1961 60kva Kamper Generator (plus full throttle run) канала Aussie50