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272
FIAT - 850 PASSENGER CARS
CON RODS
o
Fig. 423.
Connecting
rod and
bearing
shell showing oil passages to
promote lubrication of piston
interior and cylinder walt.
VALVES - VALVE SEATS· SPRINGS
__rT.OJOl
~
1---------
45·30"5'
Fig. 425 • Critical dimensions (metric) of intake and exhaust
valves and valve guides.
4S-,n'
r
-/~<~
C:==-===_____________:::::---' - -\
I
j
1.024" (26
mm)
.905" (23
mm)
1.142" (29
rom)
1.024" (26
rom)
Exhaust:
valve head diameter
- valve seat diameter
Intake:
valve head diameter
valve seat diameter
Fig. 426 • Fits of valves to seats.
IkgIJ.4'1.I1
Ikg46.5-,.J!
kg8!o.4
kg 18
±
I
Fig. 424 • Outer valve spring specifications.
43,4 = 1.709"·34 = 1.339"·24,7 = .972"· kg 23,4±1,2
=
51.6±2.6Ibs
kg 46,5±2,3 = 102.S±S.1 Ibs.
Fig. 427 - Inner valve spring specifications.
Up to engine No. 425696.
37,3 = 1.468"·30 = 1.181" - 20,7 = .815"· kg 8±O.4 = 17.6±.9Ibs
kg 18±1
=
39.7±2.2 Ibs.
VALVE SPRING SPECIFICATIONS
A
Free length.
8 C
Length and load
Cor
spnng check.
(') Up
10
engine N°. 425696.
n
Starting from engine N°.
42~697.
(3)
Up to engine N°. 425696.
(t) Starting from engine N°. 739352 and
up
10
No. 865939.
P) From engine No. 865940.
I
I
Minimum
Descrip-
Pa"
Working
Total
Inside
Wire
A
B
C
Load
lion
Number
Turns
T =
Oiam.
Diam.
Referred
10 B
,
- - - -
4127537
I
Ouler
(')
4
Silt
.823"
.142"
1.709"
1.339"
51.6 lbs
.972"
102.5 lbs
46.3 lbs
Spring
4139657
5
61/t
\ (20.9 mm) (3.6 mm)
(43.4 nun)
(34 mm)
(23.4 kg)
(24.7 nun)
(46.5 kg)
(21 kg)
(ry
- - -
- - -
4121538
I
( 0)
6"
8'/t
.539"
.091"
1,468"
1.181 "
17.61bs
I
.815"
39.7 Ibs
15,4 Ibs
Inner
4139658 \
,.
(13.7 mm)
(2.3 nun)
(37.3 nun)
(30 mm)
(8 kg)
(ZO.7 nun)
(18 kg)
(7 kg)
Spring
(0)
I
I
1.563"
4159353
I
.555
.OBB"
1.181 "
14.1 lbs
.815"
27.5 lbs
12.3 lbs
(0)
7Yz
9
(14.1 nun)
(2.1 mm)
(39.7 mm)
(30 nun)
(6.4 kg.)
(20.7 mm)
(12.5 kg.)
(5.6 kg.)
-
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