Perkins 1103D XK Systems Operation Testing And Adjusting page 14

14 KENR6912
Systems Operation Section
The lubricating oil flows from the outlet side of the oil
pump (9) through a passage to the oil filter head (6).
The oil then flows from the oil filter head through a
passage to a oil cooler (3). The oil cooler is located
on the left side of the cylinder block.
From the oil cooler, the oil returns through a passage
to the oil filter head. The oil then flows through a
bypass valve that permits the lubrication system
to function if the oil filter becomes blocked. Under
normal conditions, the oil then flows to the oil filter (7).
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 . Then, the oil flows through the passages
in the crankshaft to the connecting rod bearing
journals (5). 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.
An external line from the cylinder block supplies oil to
the turbocharger. The oil then flows through a return
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.
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