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Old 12-27-2013, 11:03 AM   #11
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Location: Stony Plain Alberta Canada
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Year: 1992
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Chassis: TC2000 FE
Engine: 190hp 5.9 Cummins
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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.

Nat
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Old 12-27-2013, 01:46 PM   #12
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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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