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138
FIAT· 850 PASSENGER CARS
Before installation on steering knuckles, the space
between cage and bearing cone must be packed
with
grease.
WHEEL HUB
The hub must not be completely filled but the
amount of grease should be such as to guarantee
a thorough lubrication of the outer bearing and be
distributed all around in the pocket between the
bearing cups.
Amount of grease specified for each hub: 1 oz
(30 gr).
HUB CAP
The cap need not be completely filled but the
amount of grease should be such (7/8 oz - 25 gr)
that the space between cap and outer bearing is
fully
packed after mounting the cap on the hub.
Adjustment Directions.
Torque wrenches must be accurate within ±6%.
Before securing the hub make sure the nut screws
in freely, then tighten with 14.5 It.lbs (2 kgm) of
torque while rocking the wheel hub 4 or 5 times
to guarantee proper setting of bearings; at this
point, undo the nut
all
the way and finally tighten
with a torque of 5.1 ft.lbs (0.7 kgm).
Drawing up hub nut with 5.1 ft.lbs (0.7 kgm) of torque.
Next, back out the nut 30°.
To do so, punch a
mark
(B,
fig. 238) on the nut washer at a point cor-
responding to the center of one of the six flats of the
nut, then unscrew the nut until the adjacent corner
(A, fig. 238) comes in alignment with the punch
mark.
Once the nut has been slackened as required,
lock it in that position by staking its collar with
pliers A. 74128 (fig. 229) into the groove machined
in
the steering knuckle threaded end, then rock
again the htib.
The htib end play should be .0010"' to .0039·'
(0.025 to 0.100 rom).
Inspection.
The wheel hub end play can be checked with
either the wheel on or down, as directed hereafter.
CHECK WITH WHEEL OFF
After removing the hub cap, push the brake
drum straight on towards car, then apply a dial in-
dicator with magnetic base to the flat face of the
drum (fig. 239).
Touch the dial indicator plunger to the end of
the steering knuckle spindle and set the indicator
at zero in such conditions.
Pull the drum all the
-=-,,",'t+---f-iHf-t€»-tB l--+\-'-'
-------
.
Backing out hub nut 30".
Fig. 238 - Locking and adjusting front wheel hubs.
A. Corner of the nut. - B. Mark on nut washer.
The figure shows the adjustment of the left front hub.
To adjust the right hub, the procedure should be reversed because the nut is
left hand threaded.
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