Perkins 1103 Series Workshop Manual page 16

15
Systems Operation Section
The oil flows from the oil filter through a passage
that is drilled across the cylinder block to the oil
gallery (4). The oil gallery is drilled through the total
length of the left side of the cylinder block. If the oil
filter is on the right side of the engine, the oil flows
through a passage that is drilled across the cylinder
block to the pressure gallery.
Lubricating oil from the oil gallery flows through
high pressure passages to the main bearings of
the crankshaft (5). Then, the oil flows through the
passages in the crankshaft to the connecting rod
bearing journals (6). The pistons and the cylinder
bores are lubricated by the splash of oil and the
oil mist.
Lubricating oil from the main bearings flows through
passages in the cylinder block to the journals of the
camshaft. Then, the oil flows from the second journal
of the camshaft (2) at a reduced pressure to the
cylinder head. The oil then flows through the center
of the rocker shaft (1) to the rocker arm levers. The
valve stems, the valve springs and the valve lifters
are lubricated by the splash and the oil mist.
The hub of the idler gear is lubricated by oil from
the oil gallery. The timing gears are lubricated by
the splash from the oil.
Turbochargers are lubricated by oil from a
connection on the side of the cylinder block. An
external line from the cylinder block supplies oil to
the turbocharger. The oil then flows through a line
to the oil pan.
Engines have piston cooling jets that are supplied
with oil from the oil gallery. The piston cooling jets
spray lubricating oil on the underside of the pistons
in order to cool the pistons.