Steering Gear Inspection/Adjustment/Assembly - Datsun 510 series Workshop Manual

STEERING GEAR
Inspection
and
Adjustment
Thoroughly clean all
parts
and examine them for
signs
of
wear or
damage Replace
any comIK nent
found
to
be
un
satisfactory
It is advisable
to
renew
the assemblies if the
steering
column
or
ball
nut
assembly is
defective
as
the
adjustment procedures
required
to
overhaul the units
are
rather involved
The dismantling and adjustment procedures for the ball
nut
assembly
can
be carried out in the
following
manner
if
it
is
decided that overhaul
procedures
are
to
be carried
out
Ball
nut
Remove the ball
guide
tube
clamp
withdraw the
guide
tubes from the ball nut
and collect the steel balls
Turn the
nut
upside down and
rotate
the
steering column
backwards and forwards until
all
36 steel balls have dropped
out
of the ball
nut
Pull the
ball nut
from the column
Inspect
the ball
guide
tubes and make
sure
that
they are
not
damaged Pay particular
attention to the ends of the tubes
that pick up the
balls from
the
helical
path
Renew the tubes if
they
are
unsatisfactory Check the steel balls and the ball nut
for
wear
and replace
the
complete unit if
necessary
Assemble
the
ball
nut
on
the
worm
with the ball guide
holes
upwards Drop
18 balls into each of the
two
holes
on
the
same
side of the ball nut
until all 36 balls
are
installed The
column should be gradually turned away from the hole being
filled and if the balls are stopped by
the end of the column hold
down those already installed
with
a
clean rod
or
punch while
turning
the column several times in the
reverse
direction The
filling
of the circuit
can
then be continued but it
may
be
necessary to turn
the column backwards and forwards
holding
the balls down first
in
one
hole and then the other
to
close the
spaces
and completely fill the circuit
Place the remaining
22 balls in the ball
guide
halves 11
balls for each half Fit the other half of the
guide tube to
each
f11led half hold
the two
halves together
a
ld plug each
open
end
with vaseline
to
prevent the balls falling
out
Push the
guide
tubes into the ball
nut
guide
holes and
assemble the guide tube clamp
Inspection
Oteck the axial clearance between the ball
nut
and
the
balls If the clearance exceeds 0 08
mrn
0 003 in
the complete
unit
must
be
replaced Inspect
the
gear
teeth of the sector
shaft for
wear or
damage Replace
any
worn or
imperfect
bearings Examine the steering
column shaft for straightness
and check that the maximum deflection does
not
exceed 0 2mm
0008 in
at
point
C in
Fig
K 9
when the shaft is
supported
at
points A and B Check the sector
shaft and
steering
column shaft serrations for
wear
Renew the parts
as necessary
STEERING GEAR Assembly and Adjustment
Grease the
lip
of the oil seal and press it into the housing
Insert the column
assembly
into the column
jacket
and
fit
the worm
bearing shims
to
the
gear
housing
Install the
flange
securing bolts
and
tighten them
to
a torque
reading
of 1 8
2 5
kgm 13 18lb ft If
a new
column
bearing assembly is
fitted it
must
be filled with
bearing
grease and cemented
to the
column
The preload
of the
worm
bearing
can
be adjusted by
altering
the thickness of the
worm
bearing
shim
Four shim
thicknesses
are
available in sizes of 0 76 0 254 0 127 0 050mm
0 0300 0 100 0 005 in 0 002 in
This adjustment
check is carried out without the sector
shaft fitted and with the worm bearings
oiled
Install the
steering
wheel
as
shown in Fig K 9
use a
spring
balance
as
indicated
to
check that the force
required
to turn
the wheel is between 4 0 8 0
kg
cm
56
l120z
inch
Select a
suitable shim from the sizes given
Assemble the selector shaft
adjuster
with
a
shim into the
sector
shaft Measure the end clearance of the adjuster
with
a
feeler gauge
as
shown in
Fig K 1 O
The correct
clearance is 0 01 0 03mm 0 0004
O 0012in
and
can
be adjusted by varying
the thickness of shim Four
thicknesses of
shim
are
available
as
follows
1 57
mm
0 0618 in
1
55
mm
0 0610 in
1 52
mm
0 0598 in
1 50
mm
0 0591 in
To assemble the
sector
shaft into the
gear
housing
rotate
the column
by
hand until the ball nut
is
at
the central position
of its travel
so
that
the
centre
tooth of the sector
shaft
enters
the
centre
tooth space of the ball
nut
Fit
a new
gasket
and
push
the sector
shaft cover and
sector
shaft into place
Ensure that
a
certain amount
of play is present between
the rack and sector
teeth before
tightening
the
cover
bolts to
a
torque reading of 1 5 2 5
kgm 10
9 18 llb ft
Temporarily lock the adjusting screw
with the locknut
Move the
sector
shaft several times from the
pitman arm
side
to
make
sure
that it turns
smoothly
Connect the pitman
arm
to
the
sector
shaft taking
care
that the alignment marks
on
the
arm
and shaft coincide
Adjust
the backlash with the steering in the central
position using
a
dial gauge
as
shown in Fig K II
Turn the
adjusting
screw
with
a
screwdriver until the
amount
of free
movement at
the top of the
pitman
arm
is
within O lmm
0 0039 in
at
a
radius of 127
mm
5 0 in Lock the
adjusting
screw
with the locknut
Fig K 12
and recheck the free
move
ment
Fill the steering
gear
housing
with the correct amount
of
recommended lubricant
Refit the
steering
gear
to
the vehicle
as
previously described
Make
sure
that the
steering
wheel is
correctly aligned and that
93