Pressure for the lubrication system is supplied by an engine oil
pump (6) which uses rotors. The engine oil pump is driven
through an idler gear from the crankshaft gear. The engine oil
pump has an inner rotor and an outer rotor. The axes of
rotation of the rotors are off-center relative 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 inner lobe rotates, the distance
increases between the lobes of the outer rotor and the lobes of
the inner rotor in order to create suction. When the distance
decreases between the lobes, pressure is created.
Lubricating oil from the oil pan flows through a strainer and a
line to the suction side (7) of the engine oil pump. The
lubricating oil flows from the outlet side of the pump through a
line to a relief valve. The relief valve is installed near the
bottom of the left side of the cylinder block.
The relief valve on the engine oil pump opens if the oil
pressure is too high. The lubricating oil which flows through
the relief valve is returned to the oil pan. The lubricating oil
which flows past the relief valve goes to the baffle type oil
cooler (3), if equipped. The baffle type oil cooler has seven
cooling plates. If the engine is equipped with a canister type oil
cooler (9), the lubricating oil then flows from the relief valve of
the engine oil pump to the oil filter. Then, the oil flows through
the canister type oil cooler which is cooled by water flowing
through supply and return lines (5) from the water pump.
The oil cooler (3) or (9) and the oil filter (8) are installed on the
left side of the cylinder block.
The oil flows from the oil filter through a passage drilled across
the cylinder block to the oil gallery. The oil gallery is drilled
through the total length of the left side of the cylinder block.
Lubricating oil flows from the oil gallery through high pressure
passages (4) to the main bearings of the crankshaft. The oil
then flows through passages in the crankshaft to the large end
bearings of the connecting rod. The pistons and the cylinder
bores are lubricated by the splash and the mist of the oil (2).
Lubricating oil flows from the main bearings through high
pressure passages (4) in the cylinder block to the journals of
the camshaft. The oil flows from the center journal of the
camshaft at a reduced pressure. The oil flows through a
passage in the cylinder block to the cylinder head. The oil then
flows into the rocker arm shaft at a reduced pressure (1) to the
bearings of the rocker arm levers. The valve stems, the valve
springs and the vale 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 (2).
The turbocharger is lubricated by oil from the oil filter through
the engine 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 turbocharged engines. The
piston cooling jets are connected to the oil gallery. The piston
cooling jets spray lubricating oil on the underside of the pistons
in order to cool the pistons.
SMCS Code: 1350
The coolant flows from the bottom of the radiator to the
centrifugal water pump. The water pump is installed on the
front of the timing case. The water pump is driven by a gear
The gear of the fuel injection pump drives the gear of the water
The water pump forces the coolant through a passage in the
timing case to the front of the cylinder block. The coolant flows
to a passage in the left side of the cylinder block. The coolant
then flows to the rear of the cylinder block.
The oil cooler is installed on the left side of the engine. A line
is connected between the housing of the water temperature
regulator and the oil cooler. Some of the coolant from the
water pump flows through this line to the following
the plates of the cooler
a line to the cylinder block
the coolant passages for the cylinders
the cylinder head