Operation and maintenance manual

Exhaust System QSB4.5 and QSB6.7
Page V-6 Section V - Maintenance Specifications
Exhaust System
Specifications
Maximum Back Pressure measured at the turbocharger outlet (exhaust manifold outlet for naturally aspirated
engines):
Without Aftertreatment SCR Catalyst...................................................................................................10 kPa [1.5 psi]
With Aftertreatment SCR Catalyst........................................................................................................20 kPa [2.9 psi]