It's interesting to think that at 80 years old, it has probably outlived all the men who designed, made and installed it, and provided no-one b***ers about with it there's every chance it will outlast not just us but the generation we hand it over to. Just needs a sip of oil and a turn of grease every 6 months (all the bearings are sleeve oil-ring types except one inside that is grease-lubricated as it's in the airflow) and the usual maintenance to brushgear. The generator tends to suffer from oil seepage onto the comm - we have to solvent-clean the brush holders, brushes and comm once a year or they stick and risk the output going intermittent which could be a showstopper. It could do with the armature out, comm skimmed, and a bigger flinger ring made for the comm end shaft. Maybe next decade.