Hello, my name is ***** ***** I am going to assist you with this.
The first genset, the 33DL4BL2541B, is a 33kW unit. It has an Onan L423, 4-cyinder diesel pushing a YHB series alternator. You need to refer to the data plate on the unit for voltage ratings and phase option, as this unit came in multiple configurations.
The L423D is an engine only - there is no wattage rating for it.
For the DVD, you need to also look at the data plate. There will be some numbers before the DVD, and that will be the kW rating of that unit. The voltage and phase option will also be on the data plate.
I am not sure which engine is on this unit, but the alternator is a UR series, which also comes in multiple voltage and phase configurations.
All 3 of those units were made in 1987.