General Description - Six Cylinder Engine Lubrication System - Perkins New 1000 Series Workshop Manual

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New 1000 Series

General description - Six cylinder engine lubrication system

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
189 illustration 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.
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.
188 Workshop Manual, TPD 1350E, Issue 4
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