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Old 12-27-2013, 10:03 AM   #11
Bus Geek
Join Date: Aug 2011
Location: Stony Plain Alberta Canada
Posts: 2,939
Year: 1992
Coachwork: Bluebird
Chassis: TC2000 FE
Engine: 190hp 5.9 Cummins
Rated Cap: 72
Re: Rpm's on a Cummings

If it is a Cummins, it's mechanically governed meaning that you can't over rev it if you tried. Once you hit the governed speed, it triggers the defuel, and cuts the fuel to the Injection Pump till the engine has dropped back to a safe speed.

"Don't argue with stupid people. They will just drag you down to their level, and beat you up with experience."

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Old 12-27-2013, 12:46 PM   #12
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Join Date: Sep 2013
Location: Vacaville, Ca
Posts: 1,090
Year: 1988
Coachwork: Crown / Pusher
Engine: 8.3 Cummins
Re: Rpm's on a Cummings

Pretty sure it's either the tach or the sensor just at idle it read 1600 rpm's, i found a black screw on the back of the tach and played with it a bit I was able to get the reading down to 900 rpm's at idle & as high as 2700rpm at idle. should they idle around 500rpm?
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