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Old 02-01-2020, 09:49 AM   #5
Zeke3
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Join Date: Dec 2014
Location: Columbus, IN
Posts: 1,406
Default 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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