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48
FIAT - 850 PASSENGER CARS
Fig. 72 - Tightening flywheel mounting nuts.
1.
Tool A. 60282. - 2. Flywheel mounting nuts. - 3. Torque wrench.
CRANKPIN DIAMETERS
Undersizes
Standard
.01"
.02"
.03"
.04"
(0.284
mm)
(0.50B mrn)
(0.162
nun)
(1.016
nun)
U1742"
1.5642"
1.5542"
1.5442"
1.5342"
(39.98Smm) (39.131
nun)
(39.477
mm)
(39.223 nun) (38.969mm)
1.5750"
1.5650"
1.5550"
1.5450"
1.5360"
(40.005
nun)
(39.751
nun) (39.497
nun) (39.243
mrn)
(38.989
mm)
MAIN JOURNAL DIAMETERS
Checking Crankshaft Balance.
Arrange «V
I)
blocks A. 95732 on a surface plate.
Place crankshaft, flywheel and clutch assembly
on «V
I)
blocks.
IT
the
crankshaft has a tendency to rotate on
either side, correct by applying putty on the opposite
side; the weight of the putty applied
is
the amount
of crankshaft unbalance.
Drill at D (fig. 71) to remove excess weight.
Checking Crankpin and Journal Align-
ment.
Support the crankshaft at ends on «v» blocks
A. 95731 and using a dial indicator check:
- alignment of jownals: max. out-of-true .002"
(0.05 rom) (total indicator reading) (fig. 73);
- alignment of crankpins: max. out-of-true to
journals
±
.020" (0.5 rom) (fig. 73);
- out-of-round of crankpins and journals: max.
out-or-true after grinding .0002" (0.005 rom);
- taper of crankpins and journals: max. out-of-
true after grinding .0002" (0.005 rom);
- squareness of flywheel mounting face to crank-
shaft axis: turn the crankshaft and set a dial
indi-
cator laterally at some 1.221" (31 mrn) from shaft
axis, runout should not exceed .001" (0.025 rom).
Distortions. if any, must be corrected
by
means
of an arbor press.
Standard
Undersizes
1.9994"
1.9896"
1.9796"
1.9696"
1.9596"
(50.785
nun)
(50.536
nun)
(50.282 rnm) (50.028mm) (49.774 mrn)
2.0002"
1.9902"
1.9802"
1.9702"
1.9602"
(50.805mm) (50.551
nun) (50.291
nun)
(SO.043mm) (49.789mm)
Cleaning Oil Passages.
For a thorough cleaning of oil passages passage
plugs must be first removed.
Reface plug seat
with cutter A. 94016/10/14 which is operated by
chuck A. 94016.
~f
0,5
0,5
POSIIIONE NORM ALE
.VRNO 01 BIELLA
( .
)
PERNO 01 BANCO
~~~Bl--
POSIIIONE LIMITE
~
-Kt;;W\Xtl-
PERNO DI BIEllA
~
~
=
='
.,
~
=
='
_ _ _ _ _ _-----' 1
_
~
~
=
'"
.,
Fig. 73 • Allowances on alignment of maTn Journals to crankpins.
0.05 = .002" - 0.5 .,. .02" -
±
0.025 =
±
.001".
Posizione normale perno dl bleHa
=
Regular position of crankpin. - Perno di banco
=
Main Journal. -
Poslzlone limite perno dl bletra ... Extreme position of crankpln.
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