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60
FIAT - 850 PASSENGER CARS
Kg 11"
Fig. 106 - Valve spring specifications.
Up to engine N. 392750.
Kg (6,6;4;
1,]
Fig. 105 - Valve spring specifications.
Starting from engine N. 392751.
Fig. 104 - Reaming valve guides.
1. Reamer handle. - 2. Reamer A. 90313. - 3. Head holding tool
A. 60041.
VALVE SPRINGS
Exhaust valve guides are differing from intake
ones as they are threaded throughout their length
for lubrication.
Replace valve guides
if play between guide and
stem cannot be taken up through renewal of valve
alone.
Use driver A. 60084 to replace valve guides.
Inspection.
Examine valve springs visually to make certain
that
they are not cracked or sagged.
Using tester Ap. 5049 check the spring load
comparing data obtained in various conditions
with
specifications in fig. 105 and chart here below.
NOTE. Valve guides are supplied for service in
a finished condition.
In case the guides should
be exceptionally refaced to remove dents from
press fitting, use reamer A. 90313 (fig. 104).
VALVE - VALVE GUIDE FITTING
SPECIFICATIONS
Valve Guide Bore
Valve Stem Diameter
Fits
of New Parts
.2765" to .2772"
.2750"
to
.2756"
.0009" to .0022"
(I.022
10 7.040 rom)
(6.985 10 7.000 mm)
(O.022
10
0.055 nun)
Fig. 101 • Cylinder head with valve springs and spark plugs.
VALVE SPRINGS
Minimum
Part No.
Working
Total
Inside
Wire
A
B
C
Load
Turns
Turns
Diameter
Diameter
ReIerred
to B
4121531
4
5
lit
.8228"
.1417"
1.1061"
1.3386"
I
51.6 lb.
.9724"
102.5 lbs
46.3 Ibs
(20.9 mm)
(3.6
nun)
(43.4 nun)
(34
mm)
(23.4
kg)
(24.7 mm)
(46.5 kg)
(21
kg)
A - Free length.
B - C """ Length and load, spring check.
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