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326
FIAT· 850 PASSENGER CARS
Idler Arm and Support.
Fig. 538 • Sectional view of Idler arm and support assembly.
1. Support. - 2. Cover screw.• 3. Cover.· 4. Pivot pin spring.· 5. Spring
cup.• 6. Pivot pin lock prate.• 7. Lubrication fittIng. - 8. Idler llrm
pivot pin. - 9. Pivot pin bushings. - 10. Idler arm. - 11. Idler arm-Io-
pivo! pin nut. -
12.
Nut cotter pin. - 13. Rubber dust shield.
o
I
3
6
/
11
7
/
!
- slide off the eo«er pin (12) and baek out the
idler arm mounting nut (11);
- withdraw the idler arm (10) and slide off the
rubber dust shield (13);
- take down the upper cover
(3),
cover gasket,
spring (4) and lower eup (5);
- remove the pin lock plate
(6),
then slide off
pivot pin (8).
Next to disassembly, inspect as follows.
Examine the pressure spring (4, fig. 538): if the
spring is sagged or bent, replace by a new one
otherwise end play of pivot pin in arm support
may result.
Check bushings (9, fig. 538) for taper and too
much play to pivot pin; in the affirmative, take down
bushings and replace by new ones; fitting clearance
between pivot pin and bushings is .0005" to .0021"
(0.012 to 0.054 rom).
After they have been press fitted in place, bush-
ings
must be reamed to the specified bore of
.8666" to .8614" (22.012 to 22.033 rom).
Bushing insertion is not a difficult matter: do not
forget, however, that the idler arm-to-pivot pin nut
must be drawn up with a torque of 54.2 to 57.9 ft.Ibs
(1.5 to 8 kgm).
The idler arm support is secured to a cross rail
in underbody (fig. 531).
To remove the idler arm support, just slide off the
drag link ball stud and tie rod ball studs, back out
four self-locking nuts mounting the support and
withdraw nut screws from the cross rail.
To strip the arm and support assembly proceed
as follows:
_ clamp the support (I, fig. 538) in a vise;
NOTE -
For check-up and adjustment of front
wheel toe-out adhere to directions covering the
Sedan version and recall the following:
-
inflate tires to recommended pressurej
-
set the car
«
at load» (7 people plus 154 Ibs -
70 kg);
-
final toe-out (toe-in negative) must be set at
.079"
to
.157" (2
to
4
mm).
WHEELS AND TIRES
Specifications only are varied as follows:
disc wheels, size . . . . . . . . . . . . . . . • . . . • .
4.00
x
12"
- tires, type
.
.
. .
.
.
. .
.
.
.
. . .
.
. . .
.
.
. .
.
~
Pirelli 5.60-12 (6 p.r.) Trasporto
Ceat 5.60-12 DR 163 (6 p.r.) Trasporto
Miehelin 5.60-12 C.
Tire pressures:
Front
Rear
\ medium load
) full load. . .
24.2 psi (1.7 kg/ern')
31.3 psi (2.2 kg/ern')
39.8 psi (2.8 kg/ern ')
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