Datsun 1968-1973 510 Owners Workshop Manual page 87

86
Chapter
5 Clutch
The models covered by thIS
manual
are
fItted wIth
a
dla
phra9m
spring
or
call spnng
alternative
to
510
serlesl
clutch
operated hydrauhcally by
a
master
and
slave
cyhnder
The clutch
comprises
a
steel
cover
which
IS bolted
and
dowelled
to
the
rear
face of
the
flywheel and contains the
pressure
plate and clutch diSC
or
driven plate
The
pressure
plate and dIaphragm
spring
or
pressure plate
release levers and spnngs
are
all attached to
the clutch
assembly
cover
The clutch dISC
IS
free
to
shde along the
splmed
gearbox
Input shaft
and
IS
held
In poSItion betWeen
the
flywheel
and
pressure
plate by
the pressure of the dl
phragm
spring or mne
coli springs
Friction hnlOg material
IS
riveted
to theclutch diSC
which has
a
spring cushmned hub
to
absorb
transmiSSion
shocks
and to
help ensure a
smooth take off
The clutch
IS
actuated
hydraulically
The
pendant
clutch
pedal IS
connected
to
the clutch master
cyhnder and hydraulic
flUId
reservoir
by
a
short
push rod The
master
cyhnder and
hydrauhc
reservoir are
mounted
on
the
engme SIde of
the bulk
head
In
front
of
the
driver
DepreSSing the
clutch
pedal moves the pIston In
the master
cyhnder forwards
so
forcmg hydraulic flUId through the clutch
hydraulic
pIpe
to
the slave
cyhnder
The pIston
In
the slave cyhnder
moves
rearwards
on
the entry
of
the flUId and actuates the clutch
release ann by a short
push rod The opposite end of the release
arm IS
forked and
carnes
the release bearmg assembly
As
thIS
pIVoted clutch release
ann moves
rearwards
It
pushes
the release bearmg forwards
to
bear agamst the dIaphragm
spring
or release levers and pUShes
forwards
so
moving the pressure
plate backwardS and
dlsengagmg
the pressure
plate from
the
clutch diSC
When the clutch
pedal IS
released the pressure
IS
forced IOta
contaCt WIth the
high
frictIon
IImngs on
the clutch dISC and
at
the
same bme
pushes the clutch dISC
a
fraction of
an
Inch
forwards
on ItS
splines
so
engagmg the clutch dISC WIth the
flywheel The clutch d
sc IS not
firmly sandwIChed
between the
pressure
plate and the
flywheel so
the drive
IS
taken
up
As
the frlCbon IImngs
on
the clutch
diSC
wear
the pressure
plate automat
cally moves
closer
to
the dISC
to
compensate
Models
fitted
WIth
the
diaPhragm
sprmg
type clutch
do
not
need
to have
the clutch periodIcally
adjusted
whereas those WIth the
WOrkmg
InSIde the
car
carefully WIthdraw theclutch pedal
to
conventIonal
sprong
clutch
do
Further
InformatIon WIll
be
found
pushrod cleVIS
pm sprmg pm
The
cotter pin may now
be Wlth
In lon
drawnfltlm
the
push
rod yoke
S1ava cyhnder
D ameter
Pressure
plate
Allowable refacmg hmlt
Adjustment
510 moclelsl
Clutch
lever
clearance
TORQUE WRENCH SETTINGS
Clutch
to
flywh8l 1
510 models
521 models
Pedal fulcrum bolt
Pedal
locknuts
Malter cylinder securmg bolts
Slave cylinder
securing bolts
Bleed
screw
Hose
connector
1 General description
07510 1905
10m
0039410
101010
00787 00906
10
20 23
mml
Ibfft Kgfm
17 4
188
24 26
12 16 1 6
22
14 17
19 24
58 87 OB 12
58
87 08 12
18 25 2 5
35
51
65 07 09
11
13 15 lB
2
Clutch
system
bleeding
1 Gather
together a
clean
glass
Jar
a
length of
rubber
tubmg
whIch fIts
tIghtly
over
the bleed
nIpple
on
the slave cylinder
a
tm
of
hydrauhc
brake flUId and
someone to help
2
Check that
the
master cyhnder IS
full If
It
IS
not
fIll
It
and
cover
the bottom
two
Inches
of
the
Jar WIth
hydrauhc
flUId
3 Remove the rubber dust cap from the bleed nIpple
on
the
slave cylinder
and With
a
SUitable spanner open the bleed
mpple
approximately
three
quarters
of
a turn
4 Place
one
end of the tube
over
the nIpple and
msert
the other
end
In
the Jaf
so
that the tuoo
onflce
IS
below
the
level of the
flUId
5 The assIstant should
now depress
the
pedal and hold
It
down
at
the end of
ItS
stroke Close the bleed
screw
and allow the
pedal to return to Its
normal
pOSition
6
Continue thIS
serles
of
operations
unt
1 clear hydraulic flUid
Without any
traces
of
air
bubbles emerges from the end of the
tubing
Be
SUre
that the
reservOir IS
checked frequently
to ensure
that the
hydraulic
flUId does
not drop too
far thus
letting air
IOta
the
system
7
When
no more air
bubbles appear
tIghten
the bleed
mpple
on
the downstroke
8 Replace
the rubber dust cap
over
thebleed
nIpple
3 Clutch
adjustment
ThIS SectIon
IS
only apphcable to
models
fItted WIth
the
conventional spnng
type
clutch
1 Chock the front wheels
Jack
up the
rear
and support on
firmly
based stands
2 Workmg under the
car
slacken the
push
rod
to
slave
cylinder
locknut
and
screw 10
the
pushrod fUlly
3 Screw
out
the pushrod
to
adjust the play
at
the end of the
release
arm to
00787 00906
In
20 23
10m
ThIS WIll gIve
the
reqUired
clearance of
0 0512
10
t 3
10m
between the
release beanng and release levers
4
TIghten
the
locknut
and
check
for
slIght
free
play
at the
pedal Lower the
car to
the
ground
4
Clutch pedal
removal and
replacement