LUBRICATION
DESCRIPTION
System is a full-flow filtration, pressure feed type.
The oil pump body is mounted to the engine block.
The pump inner rotor is driven by the crankshaft. A
windage tray, increases power by minimizing oil
windage at high engine RPM. For increased oil cool-
ing, an oil-to-coolant oil cooler is used. This cooler is
mounted inside the radiator tank.
OPERATION
Engine oil stored in the oil pan is drawn in and
discharged by a gerotor type oil pump. The oil pump
is directly coupled to the crankshaft. Oil pressure is
regulated by a relief valve. The oil is fed through an
oil filter and to the crankshaft journals from the oil
gallery in the cylinder block. This gallery also feeds
oil under pressure to the cylinder heads. Oil flows
through each cylinder heads oil passage to the rocker
shafts. Oil then feeds the camshaft journals, rocker
arms, and hydraulic lash adjusters (Fig. 100).
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE OIL LEAK
INSPECTION
Begin with a thorough visual inspection of the
engine, particularly at the area of the suspected leak.
If an oil leak source is not readily identifiable, the
following steps should be followed:
(1) Do not clean or degrease the engine at this
time because some solvents may cause rubber to
swell, temporarily stopping the leak.
(2) Add an oil soluble dye (use as recommended by
manufacturer). Start the engine and let idle for
approximately 15 minutes. Check the oil dipstick to
Fig. 100 OIL LUBRICATION SYSTEM
1 - CRANKSHAFT 9 - PEDESTAL DRILLED PASSAGE
2 - OUTER ROTOR 10 - EXHAUST ROCKER SHAFT
3 - INNER ROTOR 11 - SHAFT/PEDESTAL DOWEL PASSAGE
4 - RELIEF VALVE 12 - CAMSHAFT BEARING BORE
5 - OIL PAN 13 - CYLINDER BLOCK OIL GALLERY
6 - OIL SCREEN 14 - CYLINDER HEAD GASKET
7 - OIL PUMP CASE 15 - HEAD BOLT HOLE
8 - OIL FLOWS TO ONLY ONE PEDESTAL ON EACH HEAD -
SECOND FROM REAR ON RIGHT HEAD - SECOND FROM FRONT
ON LEFT HEAD
16 - INTAKE ROCKER SHAFT
9 - 148 ENGINE 3.5L LH
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