Page 481
STEERING KNUCKEL HOUSING
AND BALL JOINTS
REPLACEMENT OF FRONT WHEEL BE
Searing piey iS measured at the rim. If amy ex;
1
Fee 1977
= must be changed. Note that an arbor press willl De
nesdied for remosal and mstslieton of ahes! Dee ous
DS mot subyect the bearing to blows under Boy OFS
SSMOES, 25 such treatment coulis easily Gamage De
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SOMEFSMCES Speniaily aGapted for the axle anc StSEITS
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Page 482
Removal
1. Jack up the front part of the car and remove the
wheel. Remove the brake housing and hang it up
near the wheel house in order to prevent damage
to the brake hose. Then remove the hub with the
brake disc.
2. Remove the steering arm and upper ball joint from
the steering knuckle.
3. Back off the clamping screw which holds the lower
ball joint to the steering knuckle.
4. Remove the large clamp for the rubber bellows on
the inner universal joint and open up the joint. Fit
the cover 73 23 736, in the rubber bellows to keep
the needle bearings in and dirt out. Fit protective
cover 78 38 469 on the inner driver.
5. Pull the drive shaft out through the wheel house
and remove the front axle assembly. Wash this unit
thoroughly.
REMOVAL OF INNER DRIVE SHAFT
6. Remove the nut and shaft seal from the steering
knuckle. Use the pegged key 78 40 200. First prise
up the nut retainer with an arbor or other suitable
tool.
7. Remove the outer drive shaft by applying pressure
to its outer end. The outer drive shaft will be ac-
companied by the universal joint, rubber bellows
and middle drive shaft.
10.
PRESSING OUT THE OUTER DRIVE SHAFT
Press the bearing out of the steering knuckle from
the inside.
Remove the two sealing rings,their seats in the
steering knuckle and nut if they need to be changed.
Secure the middle drive shaft in a vise and strike
the hub off the shaft, using arbor 78 42 024.
REMOVAL OF HUB
Tool 78 42024
The hub, ball holder and balls can be removed
from the dome if the hub is turned through 90° in
a certain position. These items should only be re-
moved, however, if absolutely necessary.
NOTE
631-2
Febr 1977
Page 483
installation
Clean all the component parts thoroughly, and replace
worn oF damaged parts by new ones. Pay particular at-
tention to shaft seals and rubber bellows,
1, Grease the Outer universal joint using Saab special
chassis grease, The correct quantity will be obtained
by packing the dome containing the hub and balls
full with grease. Take the utmost care in preventing
dirt from entering the joints and bearings.
2. Slide the rubber bellows and clips onto the inter-
mediate drive shaft. Mount the rubber bellows on
the universal joint.
3. Mount a new circlip on the intermediate drive shaft
and compress by means of tool 78 41 612.
[ NOTE
The circlip ends should overlap under a jaw of the
pliers. They will therefore not be clear of each other
when the pliers are closed.
—————
ASSEMBLY OF MIDDLE DRIVE SHAFT IN THE HUB
Tool 78 41 612
5. If the seal in the steering knuckle housing has been
removed, insert a new one.
6. Pack the ball bearing with Saab special grease. Use
only original ball bearings.
7. Press the bearing into the steering knuckle housing
with the numbered designation on the outer race
facing outwards. Use tool 78 40 754 and 78 40 309.
PLACING OF LOCK RING IN THE TOOL wy
Tool 78 41 612 ai
LAL
4. Insert the shaft in the hub and lightly tap the shaft
end so that the circlip clicks in. Remove the pliers
and fully insert the shaft in the hub.
-
©
veer
PRESSING IN THE BALL BEARING IN THE STEERING
KNUCKLE HOUSING
Tools 78 40 754 and 78 40 309
SAAB 631~3
Febr 1977
Page 484
~~ WARNING
8. Tighten the nut and shaft seal using hook wrench [ be returned to their position
78 40 200. Lock the nut. The friction pads xn ensure correct positioning,
9. Pack the space between the lips and the inner seal near the brake disc. the brake pedal. Neglect in
with chassis grease, pump repeatedly wks in brake failure
: in .
10. Mount the outer drive shaft (with intermediate this respect will result |
drive shaft already mounted) in a press and press _
on the steering knuckle housing and bearing. Use
sleeve 78 41 067 locating on the inner ring of the
ma REPLACEMENT OF BALL JOINTS
1. Jack up the car and remove the wheel. Wash the ball
. ioint and adjacent parts carefully.
2 HF the upper ball joint is to be changed, compress the
spring with the aid of the spring scissors 89 95 847
and spring cups.
WARNING
Unconditionally, the spring scissors must be fitted
with the cups fitted in the way shown by the fig.
= = = 5 . Ss S S108
PRESSING THE KNUCKLE HOUSING AND BEARING ONTO
THE OUTER DRIVE SHAFT
Tool 78 41 067
11. Fit the two clamps on the outer rubber bellows and
the clamp for the inner bellows at the shaft.
12. If the needle bearings have been removed, lubricate POSITIONING OF SPRING SCISSORS AND SPRING CUPS,
them with Saab special grease and mount them on LEFT SIDE
their journals. Fit the cover 73 23 736 to protect
the needle bearings, and pass the drive shaft in
through the wheel house. Make sure that the inner
driver is clean and that it has been packed with
Saab special grease. Then reassemble the inner
universal joint and tighten the clamp round the
rubber bellows,
13. Refit the steering knuckle to the steering arm and
lower ball joint. Remember to provide lock plates
at the screws, and to secure these.
14. Refit the hub and the brake disc, followed by the
brake housing and friction pads. Secure the bolts
with lock plates.
15. Refit the wheel and lower the car. Tighten the axle
nut to a torque of 180 Nm (130 ft.lb., 18 kpm), and
secure.
16. Refit the hub cap.
POSITIONING OF SPRIN
RIGHT SIDE G SCISSORS AND SPRING CUPS
631-4 SAAB
Febr 1977
Page 485
3, Remove the ball joint from the steering knuckle. The REPLACEMENT OF BALL JOINT DUST EXCLUDERS
upper ball joint has two screws and the lower ball
joint one: ball joint f h To protect the ball joints from wear by foreign saps
4, Remove i r aoe wees we uate obi they are fitted with rubber dust excluders (boots). Yam
6, F ince new DRY OC AS RS PNG UR POR aN SER aged boots must be replaced by new ones.
steering knuckle. Secure the screws.
Fit the ball joint to the control arm and release the
° spring scissors.
7: Refit the:wheel:and lower:tneicer, TIGHTENING OF CONTROL ARM BALL JOINTS
NOTE If play develops in the control arm ball joints, adjustment
Ball joints must never be dismantled but should be is called for, as such play adversely influences the steering
renewed as complete units. characteristics of the car and gives rise to unwanted No!se-
1, Jack up the car and remove the wheel. Wash the ball
joint and adjacent parts carefully.
2. Detach the ball joint from the steering knuckle. The
upper ball joint has two screws and the lower ball
joint one. Clean the ball joint and remove the rubber
dust excluder. ,
3. Release the securing flange on the tightening cap, using
an arbor.
4. Turn the cap with a suitable implement until the ball
joint begins to feel slightly stiff.
NOTE
Do not tighten the ball joint excessively: it should
be possible to move it all the way in all directions
by hand.
5. Secure the tightening cap by bending down the flange
into the grooves on both sides with an arbor. Take
great pains to secure effectively, making new retaining
grooves if the old ones cannot be used. Lubricate the
ball joint copiously.
6. Fit a new rubber dust excluder and connect the ball
joint to the steering knuckle. Secure the screws,
7. Refit the wheel and lower the car.
ATTACHMENT OF STEERING KNUCKLE AND BALL JOINTS
Fite 1079 SARS 631-5
Page 487
ROL ARMS ve
coNnT 5. Detach the steering arm and upper ball joint from
the steering knuckle.
CONTROL ARMS AND STEERING KNUCKLE 6. Back off the clamping screw which holds the lower
| ball joint to the steering knuckle.
— 7. Open up the inner universal joint and remove the
entire front axle assembly. Clean thoroughly.
1. Se aa = part of the car and remove the 8. Remove the coil springs as described in section 631.
r .
9. Remove the upper and lower control arms.
the shock
= dee h a “a earns 10. Remove the stabilizer bar by undoing its brackets
+ aac a ek me site the steering arms, using on the body. The nuts can be reached from inside
co ove the seheten erties : 7 the engine compartment. Detach both body brack-
' os he b De ee ee ets and end brackets from the stabilizer bar, thus
wry iat thie: Sree ae iat Se ee oe ee enabling it to be pulled out to the right.
14
12
11
10
S 5271
| FRONT SUSPENSION, LEFT
1. Coil spring 5. Upper ball joint 9. Stabilizer bar 13. Upper control arm
6, Brake drum 10. Lower control arm 14. Rubber spacer
2. Rubber bumper
7. Lower ball joint 11. Inner drive shaft 15. Protective shield
3, Steering arm
4. Spring support 8. Shock absorber 12, Rubber bumper = 16. Hub
17. Brake housing
=n SAAB
632—1
Page 488
ee ee ee we st
11. Remove the lower rebound rubber bumpers.
12. If necessary, remove the steering gear, see section
642.
NOTE
In conjunction with overhauls of the front suspen-
sion, it is also appropriate to disassemble and ad-
just the steering gear, see section 642.
Installation
Clean all parts thoroughly. After careful examination,
reject all worn or damaged parts and fit new ones in place
of them, unless they can be adjusted in accordance with
the description. The steering gear should be adjusted as
described in section 642.
1. Pass the stabilizer bar in from the right and bolt it to
the body.
2. Reinstall the steering gear, if this unit has been re-
moved. See section 642.
. Refit the upper and lower control arms.
Refit the coil springs, see section 631.
5. Refit the front axle assemblies. If removed, lubricate
Pw
e bearings with Saab special chassis grease,
he T-shaped end of the axle. Fit the
tive cover 73 23 736 to protect the needle bear.
protec ; -asert the drive shaft through the wheel
nd | t that the inner driver is clean and
has fresh Saab special chassis grease, see section 475,
Then fit the inner universal joint, and tighten the
ubber bellows. Do not forget to secure,
the upper clamp bolts of the ball
the needl
then fit them tot
ings, 4 ;
housing. See to!
clip round ther
with tab washers,
joints.
6. Refit the sh
7. Refit the wheels
car, Return the b
brake disc.
8. Take the car out for a test run. Check the wheel align-
ment and adjust if necessary. See section 601.
ock absorbers.
and the brake housings and lower the
rake pads to their position near the
UPPER CONTROL ARM
Removal
1. Jack up the front part of the car and remove the wheel.
2. Remove the shock absorber,
UPPER AND LOWER CONTROL ARMs, FRONT SUSPENSION
1. Control arm
2a. Rubber bushing, split
2b. Rubber bushing, whole
3. Bracket
4, Washer
5. Lock washer
6. Nut
7. Shim
632-2 ARES
Febr 1977
Page 489
ompress the coil spring, using the spring sci [
- . 95 847. See section 631. eoscgatrl
4, Back off and remove the two screws holding the ball
joint and lower spring seat to the upper control arm.
5, Back off the bolts holding the control arm bearing
brackets.
g, Remove the compressed coil spring. 2
7, Remove the control arm and the bearing brackets,
Collect the shims from under the brackets.
g, Back off and remove both nuts from the bearing, thus
enabling the brackets and bushings to be taken off the
control arm.
9, As alternatives, there are either two split bushings or
one whole bushing in the bracket. To remove the
whole bushing use tool 78 41 331 for the upper one x
and 78 41 349 for the lower one.
NOTE
In no circumstances may oil or grease be used to
facilitate insertion of rubber bushings. If lubrica-
tion is needed, use soft soap and water.
Refit the bearings, complete with bushings, to the
control arm. When the two nuts have been tightened
and secured, the angle between the control arm and
the brackets should be 70 + 2°.
Reassembly
All components must be thoroughly cleaned before re- [0 O |
fitting and new parts should be provided in place of any at.
worn or damaged ones.
1. Refit the rubber bushings in the brackets. Note that
there are two types of bushings. If the whole type ANGLE BETWEEN UPPER CONTROL ARM AND BEARING
is used, drive it into the bracket with the aid of BRACKET
tool 78 41 331 (upper bushing) or 78 41 349 (low-
er bushing). Lubricate the bushing with soft soap
and water before pressing in.
3. Put the control arm in position, but do not insert
the bracket bolts,
j 4, Check that the rubber and meta! washers in the
—— upper spring seat are in place, and that the rubber
Ii bumpers have been fitted under the control arm.
if 5. Insert the compressed coil spring in its position and
\ refit the ball joint and lower spring seat to the arm.
4 6. Tighten the bolts of the control arm bearing brack-
i ets. Remember to insert the shims.
7. Slacken the screws of the spring scissors successively,
until the tool can be removed.
===
. Refit the shock absorber,
8
9. Refit the wheel and lower the car. wine
ie al 10. Take the car out for a test run and then check the ni
{ eo wheel alignment, adjusting if necessary as described i
| Ns in section 601. nn
zEss2
S 33
DRIVING IN A WHOLE RUBBER BUSHING
Tool 78 41 331 for upper bushing
Too! 78 41 349 for lower bushing
r:
. Febr 1977 SAAB 632—3
Page 490
ee i i i ee
LOWER CONTROL ARM
Removal
1, Jack up the car and take off the wheel.
Detach the lower shock absorber attachment.
. Back off and remove the two bolts holding the ball
joint to the contro} arm, thus releasing also the stabi-
lizer bar bearing.
. Back off from inside the engine compartment the nuts
holding the bearing brackets to the floor pan, where-
upon the control arm and brackets can be removed,
- Back off and remove the two nuts from the control
arm bearing and remove the brackets and bushings.
Reassembly
All components must be thoroughly cleaned before re-
fitting and new parts should be provided in place of any
worn or demaged ones.
1. Refit the rubber bushings and brackets to the control
arm. When the two nuts have been tightened and se-
cured, the angle between the control arm and the con-
tact surface of the brackets should be 0 + 2°.
0°+2
[o o}
ANGLE BETWEEN LOWER CONTROL ARM AND BEARING
BRACKET
632—4
OP ot
—
Refit the control arm by bolting the bearing brackets
efi
the body. ™"
poset the ball joint and stabilizer bar bearing to the
trol arm. Remember to insert stiffeners on the rear
contr i
of the control arm.
Refit the lower shock absorber bracket.
Refit the wheel and lower the car.
test run,
Take the car out for a eel
Check the wheel alignment, adjusting if necessary as
described in section 601.
NOTE
in no circumstances may oil or grease be used to
facilitate insertion of rubber bushings. If lubrication
is needed, use soft soap and water.
CHECKING CONTROL ARMS
If the control arms have been subjected to severe stresses
on account of a collision or other accident, they should
be carefully examined for signs of fracture or deforma-
tion. Distorted arms must be rejected and new ones fitted
in their place.
Febr 1977