How do I read my Onan generator serial number?

The serial number is listed on the nameplate and stamped on the block of the Onan manufactured engines. The serial number stamped into the block will be located on the left side (facing the engine from flywheel end) near center on the J series models. AJ and MAJ, like the AK, are on the left side but near oil fill.Click to see full answer. In this regard, how do I tell what year my Onan generator is?Call the Cummins Onan Customer Response Center with the serial number at 1-800-888-6626. Press 3 when prompted by the recording. They’ll help you identify the model and spec letter you need to order parts and manuals. If you can’t find the serial number on your set, they can help you determine where to look for it.One may also ask, how can you tell how old a generator is? The model name is usually on the case, fuel tank, or near the control panel. Most of the newer Generator models have both an engine serial number and frame serial number. Older models may just have one serial number. Location and number of serial numbers varies depending on year and model of your generator. Considering this, do generators have serial numbers? Your gas generator’s serial number can be found on a plate on the reverse of the generator, for many models this will be close to the gas output.Where are Onan generators made? About Cummins Onan It is operated by Cummins Onan. Their office is centrally located in Elkhart, Indiana. Begun by D.W. (David) Onan in 1920, Onan has been a leader and pioneer in power generation equipment for more than 80 years and engines for 50 years.