Oil pressure is 5 psi (.35 kg/cm2
) at idle, and 25-80 psi (1.8-5.6 kg/cm2
) at 3000 RPM. Rocker arm shafts are hollow and are used as lubrication oil ducts. See Fig 1 or Fig 2
.
Fig 1: Cross-Sectional View Of Engine Block Oil Circuit
Courtesy of CHRYSLER CORP.
Fig 2: Cross-Sectional View Of Cylinder Head Oil Circuit