Oil pressure at Perkins 3230 4 cylinders

Lords I need technical advice, I have problems with oil pressure from a 4230 perkins of 4 cylinders, it is a marinized generating group.
I need to know what the minimum oil pressure margins are in these engines.
I only get 2.3 pressure bar with full load (oil at 80 cº)
I have replaced: oil pump, connecting rod beans, (bench is not in poor condition) I have shoes the oil pressure valve ....
I don't know what else to do it and if with 2.3 pressure bar it is sufficient.
Please if someone can advise me to appreciate it very much, I'm running out of options.
THANK YOU