Re: What in Tarnation?
Cummins bought Onan in the late '80's and the 6AT engine was part of that deal. I worked on 4BT automotive applications and knew some of the Onan engineers well at that time. I think the 6AT was allowed to die a natural death by not developing it to meet new emission requirements, maybe around 1991. UPS used a lot of 6AT engines followed by 6BT engines later on.
Good luck with your installation, it sounds like quite a project.
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