Perkins New 1000 Series Workshop Manual page 162

19
Six cylinder engine lubrication system
160/A)
The oil pump is similar to that used on four cylinder
engines and is also driven through an idler gear from
the crankshaft gear. The inner rotor has four lobes
and the outer rotor has five lobes.
Lubricating oil from the sump passes through a
strainer and pipe to the suction side of the pump. The
oil passes from the outlet side of the pump, through a
pipe and a passage in the cylinder block to the oil filter
head. The oil then passes through a passage in the
filter head and a pipe to a plate type oil cooler, see the
off set (page 160/A), which is an integral part on the
left of the cylinder block. On naturally aspirated
engines the oil cooler has four plates and on
turbocharged engines the cooler has eight plates.
The oil cooler is fitted with a by-pass valve. If cold oil
increases the restriction in the cooler, the by-pass
valve opens and the oil passes directly from the inlet
side to the outlet side of the cooler. If the engine is not
fitted with an oil cooler, the oil passes from the oil
pump to the relief valve.
From the oil cooler, the oil returns through a pipe to
the filter head where the oil divides to the relief valve
and to the oil filter. The oil filter can be fitted on the left
or right side of the engine. If the filter is fitted on the
right side of the engine, the oil passes through a pipe
connected between the relief valve and the right side
of the cylinder block to the oil filter.
The lubricating oil passes from the filter to the
pressure rail which is drilled the full length of the left
side of the cylinder block. If the oil filter is on the right
side of the engine, the oil passes through a passage
drilled across the cylinder block to the pressure rail.
From the pressure rail, lubricating oil passes to the
main bearings of the crankshaft and through
passages in the crankshaft to the big end bearings.
The pistons and the cylinder bores are lubricated by
splash and oil mist.
Lubricating oil passes from the main bearings through
passages in the cylinder block to the journals of the
camshaft. Lubricating oil passes, at a reduced
pressure, from the second journal of the camshaft
through a passage in the cylinder block and cylinder
head to the rocker shaft. The oil passes through a
passage in the rocker shaft to the bearings of the
rocker levers. The valve stems, valve springs and the
tappets are lubricated by splash and oil mist.
The hub of the idler gear is lubricated by oil from the
pressure rail and the timing gears are splash
lubricated.
162
(page The turbocharger is lubricated by oil after the filter. Oil
is supplied from a connection on the right side of the
cylinder block through an external pipe to the
turbocharger. The oil passes through the
turbocharger and returns through a pipe to the sump.
Turbocharged engines have piston cooling jets fitted.
These jets are connected to the oil pressure rail and
spray lubricating oil inside the pistons to keep them
cool.
New 1000 Series
Workshop Manual, TPD 1350, issue 3