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116
FIAT· 850 PASSENGER CARS
777//,
V~
~~
~
,..----
~
1--1
"iT
3
- - - - - - -
Fig. 193 - Placing drive pinion rear bearing into transmission-
differential case.
1. Retainer plate screws and spring vtashers .• 2. Bearing retainer
plates. - 3. Drive pinion rear ball bearing.
b
Fig. 194 • Diagram showing use of tools for figuring pinion
shim thickness.
1. Dummy pinion A. 70101. ·2. Fixture A. 95690 with dial indicator. -
b. Dial indicator reading.
K'/7/
/ '
l
1"///7>7-
V= ;
1
~
fs
~
I-----
1'---,
- _ .
Fig. 195 • Drive pinion and shim fitting diagram.
1. Drive pinion shim. - 2. Drive pinion. - $. Shim thickness.
Move back and forth, horizontally, the indicator
sliding support and watch fluctuations of
dial
point-
ers; block the dial indicator in the position cor-
responding to the minimum reading (fig. 196).
Repeat above step at the opposite bearing.
The average of two readings obtained represents
« b»
(fig.
194).
The amount of {( a»
is stamped in production on
pinion stern; it may be positive, preceded by the
sign plus, or negative, in which case it is preceded
by the sign minus.
If
the number stamped on pinion stern is preceded
by the
«
plus» sign, the thickness of the shim is
obtained by «subtracting» this figure from the
indicator reading.
Conversely, if the number stamped on pImon
stern is preceded by the
«
minus» sign, the thick-
ness of the shim is obtained by « adding
l '
this figure
to the indicator reading.
Fig. 196 - Step for figuring the thickness of drive pinion shim.
1. Differential cage bearing seat.• 2. Dial indicator.• 3. Fixture
A. 95690 for dial indicator•• 4. Dummy pinion
A.
70101.
In
case there is no rate in the shim thickness
range corresponding exactly to the amount of «5»
choose the thicker shim than the amount of
(l
S
I)
next in the shim thickness range.
When assembling the differential cage, check
the gear rolling torque: using tool A. 95697/4
without threaded pivot, hold either side gear in
position and with dynamometer A. 95697. turn over
the other side gear: the gear rolling force should
be 5.1 to 6.1
It.lb.
(0.2 to 0.5 kgm).
If
necessary, correct the gear rolling torque by
repositioning the side gears with the use of a
dif-
ferent thrust washer.
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