Figure 1. Schematic Diagram of Typical In-Line Engine Lubrication System
block. Oil from these drilled passages enters the drilled rocker shaft brackets at the lower ends of the drilled
bolts and lubricates the rocker-arm bearings and push-rod clevis bearings.
Excess oil from the rocker arms lubricates the lower ends of the push rods and cam followers, then drains to
cam pockets in the top of the cylinder block, from which the cams are lubricated. When these pockets are
filled, the oil overflows through holes at each end of the cylinder block and then through the flywheel housing