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26
Chapter I-General Engine Repair
assembly with the tool
shown
in fig. 41. This tool
is
not required on
the
239 or 256 cubic inch
engi ne.
In-
stall
the two screws that retain
the cap to
the cylinder
block.
NOTE
:
Check
th
e
retain er to
cylinder
block
seal
Jor leaks.
S
quirt
a
j
ew
drops
of oil
into
the
corn ers
of
the
seals
on the inside of
the
cylinder block. Blow
compressed
air into th
e
seal
corne rs
from
th
e
in-
side
of lhe
block. If
oil seeps
past I.h
e
seal,
remove
the
seal
retaine
r.
Be sure all mating surfaces
are
clean.
In stall new
seals and
re
p eat th
e
air
tesL.
8. OIL PAN, OIL FILTER,
AND
OIL PUMP AND PRESSURE RELIEF VALVE
The inspection
and
repair
procedures
applicable to
the
above components are presented
below.
In
addi-
tion, the removal,
disassembly, assembly, and
installa-
tion
procedures for
the
oil filter are given,
inasmuch as
these procedures
are
applicable to
all engines.
a. Oil Pan.
R
emove
the oil
pan. Scrape a
ny
dirt or metal part-
icles
from
the
inside
of
the
pan.
Scrape
all
old
gasket
material
from the
gasket surface. W ash
the
pan
in
a
solvent
and
dry it
thoroughly.
Check
the pan
for
cracks, holes, damaged drain plug
threads,
a
loose
baffle, or warped
gasket
surface.
R epair
any damage, or
replace the
pan if repairs
cannot be made.
h. Oil Filter.
The
full
flow-type
oil filter, used on all
e ngines,
filters the entire
output of the
pump
before
the oil
enters the
engin
e
lubrication
system.
A
built
in
by-pass provides oil to
the
system in case
the
filter element becomes
clogged. The
by-pass is
located in the
hollow
center bolt and consists
of
a
spring loaded
valve.
When
the
element is
clean
and
oil
will
flow
through
it,
the pressure difference be-
tween the
inne
r
and outer
faces
of the valve is not
great enough to overcome
the
spring pressure behind
the
valve.
When
the element
is dirty
and will not
permit
a sufficient
flow
of oil, the pressure
on
the
inner
face of the valve drops, and
the
pressure
differ-
ence
between
the
valve
faces
is
enough to cause
the
valve to open.
Oil then
by-passes
the element, thereby
maintaining a
supply
of oil to
the
engine
lubrication
system.
(1)
REMOVAL.
Remove
the filter from
the bottom
of
the
vehicle. Place
a
pan
on
the floor directly under
\\\~
BY·
PASS
VALVE
SPRING
BY·
PASS VALVE
.--'''_". HOUSING
....
"rK'
Nv
RETAINER
GASKET
f iLTER
6
ADAPTER
.
FiniNG
ANTI-ORAINBACK. \
DIAPHRAGM
6080
Fig.
42-0il
Filter-Disassembled
the filter.
Remove
the filter
center
bolt,
then
remove
the
filter assemb ly
and
gasket.
(2)
DISASSEMBLY.
R
e
move the
filter element,
neoprene
gasket,
spri
ng,
a nd seat,
then
remove the
center
bolt and fibre
gasket
from
the
cover.
Discard
the filter
element
and a
ll
gaskets. The o
il
filte
r
is
shown
disassembled
in
fig.
42.
(3)
CLEANING.
Wash
a
ll
parts
in
a
solvent and
dry them thoroughly.
M ak
e sure a
ll
the
openings
in
the
center
bolt
are
clean.
(
4)
ASSEMBLY.
Install
a
n
ew
fibre gasket on
the
center
bolt, then place the bolt through the filter hous-
ing.
Install
the
sprin
g a
nd sprin
g seat
assembly on
the
bolt,
making
sure
the
seat
tangs are engaged
in
the spri
ng. Install
a
n
ew neopre
n
e
gasket and a
new filter element over
the
center
bolt.
(5)
INSTALLATION.
Be
sure
the
two elongated
hol
es
in the
oil
filter
diaphragm
are a
t the
top,
when
positioned on the block,
as
shown
in
fig.
4
3.
Install
a
new neoprene
gasket
in
the filter
housing
recess.
Place
the filter assembly
in
position, and thread
the center
bolt
into
the
adapter,
finger-tight.
Rotate
the filter
as-
sembly
slightly,
in
each
direction,
to
make
sure the
gasket is
seated e
venly.
Tighten the center
bolt to
20-25
foot-pounds
torque.
6081
Fig. 43-0il
Filter Diaphragm Posilion
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