Fiat X 1/9 1978 - PISTONS-CONNECTING RODS; Main data of cylinder bore, piston, and rings.; CHECKS

III
-1974
Section
No.
101.05
Page
43
Connecting
Rods
and
Pistons
PISTONS-CONNECTING
RODS
86.000
86.050
1.478
3.967
2.030
1.535
3.987
2.050
1.555
I—
1
.490
Main
data
of
cylinder
bore,
piston,
and
rings.
Piston
class
and
piston
bore
class
are
identified
by
letter
and
number
stamped
on
underside
of
piston
bosses.
Piston
pin
class
is
stamped
on
pin
surface.
1.
Piston_boss
bore
class.
2.
Piston
class
letter.
3.
Matching
number
of
connecting
rod
to
cylinder.
CHECKS
Before
assembling,
check
weight
of
four
pistons.
Pistons
must
have
same
weight
within
10.088
02.
(12.59.
If
necessary,
remove
metal
from
base
of
piston
by
milling.
Maximum
metal
than
can
be
removed
is
0.177
in.
(4.5mm).
Milling
diameter
should
be
limited
to
2.775
in.
(70.5mm).
a
:
2.232
in.
(56.70mm)
nominal
piston
height.
h
=
2.055
in.
(52.20m)
minimum
height
after
milling.
c
:
2.775
in.
(70.50mm)
maximum
milling
diameter.
-eE=-——W
1.990
'
3.925
3.937
"
A=
85.920
to
85.930
C=
85.960
to
85.970—
E=
85.980
to
85.990