Perkins New 1000 Series, Workshop Manual, Page: 159 / 290

Workshop Manual, TPD 1350, issue 3
159
19
New 1000 Series
Lubrication system
19
General description
Four cylinder engine lubrication system ( page
160 /A)
Pressure lubrication is supplied by a rotor type pump
which is driven through an idler gear from the
crankshaft gear. The pump has an inner rotor and an
outer rotor which are off-centre to each other. There
is a key between the inner rotor and the drive shaft.
The inner rotor has six lobes which mesh with the
seven lobes of the outer rotor. When the pump
rotates, the space between the lobes of the outer rotor
which are in mesh increases to cause a suction or
decreases to cause a pressure increase. If a balancer
unit (
page 161 /A) is fitted, the oil pump is fitted to the
balancer frame and is driven by the balancer drive
shaft.
Lubricating oil ( page 160 /A1) from the sump passes
through a strainer and pipe to the suction side of the
pump.
The lubricating oil ( page 160 /A2) passes from the
outlet side of the pump through a pipe to a relief valve,
which is fitted to the bottom of the left side of the
cylinder block. If a balancer unit is fitted, the relief
valve is fitted in the frame of the balancer. The relief
valves opens if the oil pressure is too high and allows
some of the lubricating oil to return to the sump.
From the relief valve, lubricating oil passes to a plate
type oil cooler (some naturally aspirated engines do
not have an oil cooler). The oil cooler is either fitted to
the left side of the cylinder block and has seven
plates, or it is fitted between the oil filter head and the
filter canister and has ten plates. Some oil coolers are
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.
Lubricating oil from the oil cooler, passes to an oil
filter. The oil filter can be fitted to the left or right side
of the engine. If the filter is fitted to the right side
(19A.04/A) of the engine, the oil passes through a
pipe connected between the relief valve and the right
side of the cylinder block. The oil passes from the pipe
through a passage in the right side of the cylinder
block to an oil cooler and then to the oil filter. When
the oil filter is on the right side of the engine, and an
oil cooler is fitted, the oil cooler will be between the oil
filter head and the oil filter canister.
The lubricating oil passes from the filter to the
pressure rail which is drilled the complete 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 ( page 160 /A3) passes from the main
bearings through passages in the cylinder block to the
journals of the camshaft. Lubricating oil passes from
the centre journal of the camshaft through a passage
in the cylinder block and cylinder head to a restriction
in the pedestal of the rocker shaft, at a reduced
pressure (
page 160 /A4), to the rocker bushes. 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.
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. Naturally aspirated engine types AR and AS
have one piston cooling jet fitted to the number one
cylinder position.
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