Lubrication System - Ford 1962 Thunderbird Shop Manual

1-4
GROUP
1-
ENGINE AND EXHAUST SYSTEM
mitted
to the
valve rocker arm via
the
valve push
rod until
there
is
solid
contact
between
the
valve and
the
valve end of the
valve
rocker
arm
(zero
valve
lash). In
this
position,
the
oil
hole in
the
lifter
and plunger
is
indexed
with
the
lifter
oil
gallery
and
oil
is forced
under pressure
into
the
plunger.
This
creates
a pressure
dif
ferential
above
and
below
the
valve
disc. The high
pressure above
the
valve
disc forces
the
valve
disc
open
and the
oil
fills
the
area
below
the
plunger,
equalizing
the
pressure on
each side
of
the
valve
disc.
Whenever
clearance
between
the
valve and
the
valve
rocker arm
tends to
be
present,
the
plunger
spring expands
pushing
the
plunger
until
there
is
solid contact
between
all
parts of
the
valve
train
mech
anism.
As
the
camshaft
rotates
(valve
opening),
the
valve
lifter is
raised
and
the
sudden
increase in
oil pres
sure
below
the
plunger
forces
the
valve
disc
closed and
the
lifter be
comes a
hydraulic
ram.
During
this
period, a slight
leakage
of oil
from
below
the
plunger occurs.
As
the
high
point on
the
camshaft
lobe
ro
tates
past
the
lifter,
the
push rod
forces
the
valve
lifter down
and re
seats
the
valve.
The
pressure on
the
oil
below
the
plunger
is
relieved and
the
valve
disc
opens so
that the
chamber can again
be filled. This
cycle
is
repeated
for
each revolution
of the camshaft.
LUBRICATION SYSTEM
Oil from
the
oil pan sump,
located
in
the
front
of
the
oil
pan,
is forced
through the
pressure-type
lubrication
system
(Fig.
8) by
a rotor oil pump.
A
spring-loaded
relief valve
in
the
pump limits
the
maximum pressure
of
the
system.
Oil
relieved
by the
valve
is directed back
to the
intake
side of
the
pump.
All
the
oil
discharged
by the
pump
passes
through
a
full flow-type filter
before it
enters
the
engine.
The filter
is
mounted
in
a vertical position at
the
lower left front
of
the
engine.
A
relief
valve
in
the
filter
permits
oil
to by
pass
the
filter if it becomes
clogged.
From
the
filter, the
oil
flows into
the
main oil
gallery
which
is located
in
the
center of
the valve push rod
chamber
floor. The
oil gallery sup
plies oil
to
each
individual
camshaft
bearing, through
drilled
passages
in
the
block.
Passages
are
drilled from
each camshaft
bearing to
each main
FIG.
8
Lubrication System
bearing. No. 1
camshaft
bearing
feeds No. 1
main
bearing,
and
No. 2
camshaft
bearing
feeds No. 2
main
bearing,
etc.
The
oil
then
flows
through
notches or grooves
in
the
main
bearings
to
lubricate
the
crank
shaft
journals. A jiggle
pin
in
the
main oil
gallery
front
plug allows
any
air
that
may
be
trapped
in
the
oil
to
escape.
The
timing chain and sprock
ets are splash
lubricated
by
oil
from
the
jiggle
pin.
The
crankshaft
is drilled from
the
main
bearings
to the
connecting
rod
bearings.
A
small groove
is located in
the
connecting rod at
the
mating
face
where
the
cap
contacts
the
connect
ing
rod.
This
groove
is
used
as
an
oil squirt
hole for
cylinder wall
lu
brication. Oil from
the
connecting
rod squirt
hole lubricates
the
oppo
site cylinder wall.
For
example, the
No. 1 connecting
rod oils
No. 5
cyl
inder,
etc.
As
the
crankshaft turns,
the
hole in
the
connecting
rod
bear
ing
aligns with
the
hole in
the
jour
nal
causing
a
direct
squirt of oil onto
the
cylinder wall.
Oil
passages are
drilled from
the
main oil
gallery
to
each
valve
lifter
A1246-A
oil gallery.
Oil from here feeds
the
valve
lifter
assemblies.
A
reservoir
at each
valve
lifter bore boss
traps
oil so
that
oil
is
available
for
valve
lifter
lubrication
as
soon as
the
en
gine starts.
An
oil
passage
is
drilled
from
No. 2
camshaft
bearing
web
to the
left
cylinder
head between Nos. 5
and
6
cylinders to
lubricate
the
valve rocker arm
shaft
assembly
(Fig. 9). The
oil passage
in
the
cyl
inder head is drilled from
the
cylin
der head bolt bore
to the
No. 2
valve
rocker arm
shaft support.
The
oil
flows
through the
valve
rocker arm shaft
through
drilled holes
in
each valve rocker arm to
lubricate
the bushing
and
both
ends
of
the
valve rocker arm.
The
excess oil spi
rals
down
the
rotating push rods and
lubricates
the
push rod
seats.
The
right valve rocker
arm shaft assem
bly is similarly lubricated from No.
4
camshaft
bearing
via
the
No. 4
valve rocker arm shaft support.
A baffle located
under
the
valve
rocker
arm shaft
assembly shields
the
valve stems
from
oil splash.
Excess
oil
is
returned
to the
oil pan
through
drain-back holes located
at each end