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16
Systems Operation Section
Lubrication System
Oil pressure for the engine lubrication system is
provided by an engine mounted oil pump. The engine
oil pump is located on the bottom of the cylinder block
and within the oil pan. Lubricating oil from the oil pan
flows through a strainer and a pipe to the inlet side of
the engine oil pump. The engine oil pump is driven
from the crankshaft through an idler gear.
The engine oil pump has an inner rotor with four
lobes. The inner rotor is mounted to a shaft which
also carries the drive gear. The engine oil pump also
has an outer annulus with five lobes. The axis of
rotation of the annulus is offset relative to the rotor.
The distance between the lobes of the rotor and the
annulus increases on the right hand side when the
rotor is rotated. The increasing space between the
lobes of the rotor and the annulus causes a reduction
in pressure. This reduction in oil pressure causes oil
to flow from the oil pan, through the oil strainer and
into the oil pump.
The distance between the lobes of the rotor and
annulus decreases on the left hand side when the
rotor is rotated. The decreasing space between the
lobes of the rotor and annulus causes oil to be
pressurized. The increase in oil pressure causes oil to
flow from the oil pump outlet into the engine
lubrication system.
The oil flows from the pump through holes in the
cylinder block to a plate type oil cooler. The plate type
oil cooler is located on the left hand side of the
engine.
From the oil cooler, the oil returns through a drilling in
the cylinder block to the filter head.
The oil flows from the oil filter through a passage to
the oil gallery. 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 pipe assembly. The pipe assembly is
mounted to the lower face of the cylinder block.
Lubricating oil from the oil gallery flows through
passages to the main bearings of the crankshaft. The
oil flows through the passages in the crankshaft to the
connecting rod bearing journals. 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 at a reduced pressure to the cylinder
head. The oil then flows into the rocker arm bushing
of the rocker arm levers. The valve stems, the valve
springs and the valve lifters are lubricated by the
splash and the mist of the oil.
The hub of the idler gear is lubricated by oil from the
oil gallery. The timing gears are lubricated by the
splash of the oil.
This document has been printed from SPI2. NOT FOR RESALE.
The turbocharger is lubricated by oil via a drilled
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passage through the cylinder block. An external line
from the engine block supplies oil to the turbocharger.
The oil then flows through a line to the oil pan.
Piston cooling jets are installed in the engine. The
piston cooling jets are supplied with the oil from the oil
gallery. The piston cooling jets spray lubricating oil on
the underside of the pistons in order to cool the
pistons.
Cooling System
Introduction (Cooling System)
The cooling system has the following components:
• Radiator
• Water pump
• Cylinder block
• Oil cooler
• Cylinder head
• Water temperature regulator (thermostat)
UENR0617
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