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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14560
Experience:  Certified on Onan and Generac generators
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I am trying to determine the wattage rating and proper Onan

Customer Question

I am trying to determine the wattage rating and proper Onan replacement for some old stand-by generator units serving a municipal wastewater plant. Can you provide any information for the following model numbers:
Onan 33DL4BL2541B Serial Number: L870947683
Onan/Cummins L423D-I/10387C Serial Number: H873253472
Onan DVD-15R/27613B Serial Number: (###) ###-####
Submitted: 8 months ago.
Category: Small Engine
Expert:  Hank F. replied 8 months ago.

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.