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  1. sjs2011

    Cummins NT855 F2 on fire pump

    Hello all, We have an old diesel engine built in 1975. It is rated for 285 HP @ 1750 RPM. The problem is, as soon as engine loaded with fire pump, it's rpm drops down. For some reason it is not maintaining constant rpm. It drops down to ~ 1300 rpm (per manufacturer spec, there will 8% of rpm...

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