Gearbox Description; Three Speed Gearbox Removal/Dismantling; Gearbox Inspection And Overhaul - Datsun 510 series Workshop Manual

Gearbox
GEARBOX Removal
GEARBOX
Dismantling
GEARBOX
Inspection
and Overhaul
GEARBOX Assembling
THREE SPEED GEARBOX GEARCHANGE CONTROL Removal and
Adjusting
AUTOMATIC TRANSMISSION Gearchange
control linkage
DESCRIPTION
Three
types
of transmission
are
available for the Datsun
models covered by
this manual Either
a
three
speed gearbox
a
four speed gearbox
or
three speed
automatic transmission
can
be fitted
The three and four speed gearboxes
are
equipped with
nchromesh
on
all forward
gears
with the three speed gearbox
operated by a steering
column gearchange system and the four
speed gearbox by
a
floor mounted gear lever
Two
types
of synchromesh
are
used in the four speed
gearboxes
Either
Borg
Warner
or
Servo
types
may
be fitted
The
gearboxes
differ
only
in the
synchromesh
devices
whereby
the baulk
rings synchronize
the
coupling
sleeve with the main
shaft gear on
the Warner
gearbox
This action is
accomplished
by
a
synchrcrring
on
the servo gearbox
THREE SPEED GEARBOX Removal
I Jack up the vehicle and support it on
stands
2
Disconnect the hand brake cable
at
the equalizer bracket
Slacken the
two
exhaust
pipe centre clamps
and turn
the
centre
section of the exhaust
assembly to
the left
as
shown
in Fig F 2
3 Disconnect the
propeller
shaft from the
rear
axle drive
flange by removing
the four
securing
bolts Seal off the
gearbox extension housing to prevent
the loss of oil and
withdraw the shaft
to
the
rear
4
Disconnect the speedometer
drive cable from the adaptor
in the
gearbox
extension
housing
Fig F3
S
Disconnect the lower shift rods from the shift levers
Fig
F 4
and
remove
the
cross
shaft assembly from the
gearbox casing
Remove the clutch slave
cylinder
from the
clutch
housing Fig
F 5
6 Support the engine with ajack
positioned
underneath the
oil sump
making sure
that the
jack
does
not
foul the drain
plug
A block of wood should be
placed
between the sump
and jack
to
avoid damaging the sump
7
Remove the bolts securing the
rear
engine mounting
to
the crossmember Position
ajack
under the gearbox and
remove
the bolts attaching the crossmember
to
the
body
Lower the jack under the engine
so
that the engine is
tilted
to
the
rear
Remove the starter
motor and the bolts
securing
the clutch
housing
to
the
engine
Lower the
jack
slowly
and withdraw the
gearbox
towards the
rear
of the
vehicle
THREE SPEED GEARBOX Dismantling
Drain the
gearbox
oil Remove the dust
cover
release
the retainer spring and remove
the withdrawal lever
complete
with release bearing from the clutch housing See
section
CLUTCH
Remove the gearbox
bottom
cover
the
speedometer
drive
pinion assembly and the
rear
extension
housing
Take out the
cross
shaft
retaining rings
and
unscrew
the
nuts
securing the
operating
lever lock pins Use
a
hammer and punch
to
drive
out
the
pins
and withdraw both
cross
shafts Fig F 6
Remove the fr
mt cover
and withdraw the
counter
shaft
Lift out
the countersbaft
gear
cluster together
with the needle
roller
bearings
and spacers
Fig
F 7
Remove the
reverse
idler
gear
shaft lock bolt and
remove
the shaft and the idler gear
Fig
F B Drive
out
the pins securing
the selector forks
to
the
selector rods
Unscrew the interlock
plug
and
remove
the detent ball
and spring Fig F 9
Remove the first
reverse speed
and second
third speed selector rods and lift
out
the selector forks
Withdraw the main shaft
assembly and the drive shaft
assembly
from the
gearbox
See
Fig
F 1O and F 11
To dismantle the mainshaft release the
circlip
from the
front of the mainshaft
as
shown in
Fig
F 12 and
remove
the
second and third speed synchronizer
hub and second speed
gearwheel Fig
F 13 Remove the circlip securing the
speedo
meter
drive
gear
and withdraw the gear
together with the ball
and spacer
Fig
F 14 Remove the mainshaft
bearing using
a
press Hold the
rnainshaft
reverse
gear and
tap
the shaft
on a
piece
of wood
to
release the
reverse
gear
assembly together
with the first speed gearwheel
GEARBOX
Inspection
and Overhaul
Oean all
parts thoroughly
and examine the gearbox case
and extension
housing
for cracks
If the joint
faces
are
burred
or
pitted it
may
be necessary
to
replace
the units if repair
cannot
be carried out
satisfactorily
Remove
any
adhesive which remains
on
the faces
The rear
extension housing
bush should be renewed if
worn
unevenly
Clean the
bearings
and
dry
with
compressed air
taking
care
that the
bearings
do
not
spin
Turn the ball
bearings
to
make sure that
they
run
smoothly
and without
play Replace
the needle bearings if worn or damaged in
any way
It is advisable
to
renew
the needle roller bearings after they
have been installed for
a
considerable
period
as
it is difficult
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