SUBSECTION 11E
L U B R I C A T I O N SYSTEM
GENERAL
Clean engine oil is assured at all times
by the use of a replaceable element type
full-flow oil filter incorporated in the en-
This section covers repair information on
gine lubrication system. With this type
the oil pump, oil pressure regulator, oil
filters, oil cooler, dipstick, oil pan, and
filter, which is installed in the lubricat-
ing system between the pump and the
ventilation system.
cooler, all of the oil is filtered before en-
tering the engine.
DESCRIPTION
A by-pass type filter with replaceable el-
ement is used,
A portion of the oil is
General
continually by-passed through the filter
and the filtered oil is returned to the
Figure 11E-1 on page 11E-2 schematically
e n g i n e oil pan.
illustrates the flow of oil through the lu-
bricating system including the various
Stabilized oil pressure is maintained with-
components s u c h a s t h e o i l p u m p , o i l
in the engine at all speeds, regardless of
cooler, by-pass and full-flow filters, the
the oil temperature, by means of a regu-
pressure r e g u l a t o r v a l v e a n d b y - p a s s
lator valve located between the pump out-
valve.
let and the inlet to the cylinder block.
When the oil pressure at the valve ex-
The lubricating oil is circulated by a
ceeds 50 psi (345 kPa), the regulator
gear-type pressure pump mounted on the
valve opens and remains open until the
pressure is less than the opening pres-
No. 1 and No. 2 main bearing caps and
gear driven from the crankshaft.
sure.
All the oil leaving the pump is forced
through the full-flow oil filter to the
O i l Distribution
cooler and then into the oil gallery in the
cylinder block from where it is distrib-
Oil from the cooler is conducted by a
uted to the various engine bearings.
v e r t i c a l passage to a longitudinal main oil
The drain from the cylinder head and
gallery on the blower side of the cylinder
other engine parts leads back to the oil
As shown in Figure 11E-1 on
block.
page 11E-2, this gallery distributes the
pan.
oil, under pressure, to the main bear-
ings and to a horizontal, transverse pas-
A spring-loaded integral plunger-type
sage at each end of the cylinder block.
relief valve, located in the oil pump
body, by-passes excess oil from the dis-
From each of these two horizontal pas-
charge to the intake side of the pump
sages, o i l f l o w s t h r o u g h t w o v e r t i c a l
when the pressure in the engine oil gal-
bores (one at each end of the cylinder
lery exceeds approximately 105 psi (724
block) to the end bearings of the cam-
kPa).
shaft and balance shaft. In addition, oil
is forced through an oil passage in the
camshaft which lubricates the camshaft
If the oil cooler should become clogged,
Oil for lubricat-
intermediate bearings.
the oil will flow from the pump through a
ing the connecting rod bearings, piston
spring-loaded by-pass valve directly into
the oil gallery.
Subsection 11E