Graphic Demonstration Of Values A And A; Setting Dial Indicator To Zero On Tool A.62037; Adjusting Final Drive Gear Set - Fiat 500L Workshop Manual

FIG 6:9

Graphic demonstration of values A and a

'A' Distance between pinion front bearing inner shoulder and
the axis passing through the differential bearing housing
centre
'a' Difference between the minimum value called out on drawing
(5.9268inches — 150.54mm) and actual machining value
of the distance between pinion front bearing inner shoulder
and differential bearing housings
DIAL GAUGE C.689
FIG 6:10 Reading value a on gauge C.689 to determine
drive pinion shim thickness
72
TOOL A.62036
TOOL
A.62037
FIG 6:11

Setting dial indicator to zero on tool A.62037

of 115.64 mm. Fiat tool A.62037 as shown in FIG 6:12
used in conjunction with the dial gauge can now be used
to measure the deviation 'c' from the lower manufacturing
limit as follows:
1 Place the dial gauge on a stand on the surface plate and
place Fiat tool A.62037 on the plate as shown in the
FIG 6:11.
2 Carefully slide onto the Fiat tool the following items,
third-speed driven bush, third- and fourth-speed gear
engagement sleeve, hub, fourth-speed driven gear bush
and drive pinion roller bearing inner race. Set the dial
gauge to zero using Fiat tool A.62037 as the datum and
then rest the dial gauge plunger on the roller bearing
inner race and take a reading at the dial as shown in
FIG 6 :11. This reading will represent 'c' which can now
be used in the formula.
C = 1 1 5 . 6 4 + c
Once the values of A', 'B' and 'C have been found as
detailed above we can now insert the values into the basic
formula S = A—(B + C) which will now give us:
S = 1 50.54 + 41.00+ a — (75+ b +115.64 + c )
which can be simplified by using algebra to give us the
following formula:
S = 0.90 + a —(b + c)
Shims are supplied in the following thicknesses,
.0039 inch and .0059 inch. One or more shims should be
used to make up the required shim thickness.
Adjusting final drive gear set (500D, and 500F
sedan and early station wagon):
The procedure for adjustment of the final drive gear
set is exactly the same as for the new 500 model except
(deviation)