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It's also interesting that the TM shows the flywheel and ring gear as 2 separate parts. So maybe there is a totally different ONAN PN for the complete assembly not shown in the TM?? I also see that GM lists the "Flywheel" as being 12" x 12" x 6" and 2 pounds?? It's more like 60lbs. So maybe...

Its funny that no matter what PN listed above you research, not much info is available. and no pictures. Here's where I got my info. https://greenmountaingenerators.com/product/mep802a-mep803a-flywheel-onan-186-6467/ Green mountain lists 186-6467 as the Onan PN for an 802/803 flywheel for $995...

A new flywheel isn't gonna be cheap unless you can find someone parting out a machine. Here's a new one but it's almost $300... which is still better than the $1000 GM Generators wants! https://www.smallenginesprodealer.com/part-onan-186-6467/ There are others available, but more expensive. Just...

Unfortunately you have to tear down the entire generator to get in there. It's not the greatest of designs. You are usually better off just removing the radiator support and pulling the motor/gen out as a unit then tear the generator head apart to get to those bolts.