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B-series cummins idle speed

Updated: 10/22/2022

Wiki User

∙ 14y ago

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I've got a couple 6BT 5.9M diesel engines in a boat. The service manual calls for idle speed to be set between 700 and 900 Rpm. When I got the boat the idle was set to about 750 Rpm which I found to cause hard shifts and jerky handling in close quarters. I dropped the idle speed to just over 600 Rpm. Any lower than that and the engines would get rough and oil pressure would drop to about 20psi on the gauges that normally read 80psi. Too spooky for my liking. Even at 600 Rpm, oil pressure is about 40psi.

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∙ 14y ago

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