Valve Mechanism - Fiat 850 Sedan 1968 Shop Manual

ENGINE: VALVE MECHANISM
VALVE MECHANISM
MAIN SPECIFICATIONS . . .
CAMSHAFT AND BUSHINGS
TAPPETS . .
PUSH RODS
VALVE TIMING
Adjusting Valve Tappet Clearance.
TIGHTENING REFERENCE .
MAIN SPECIFICATIONS
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DESCRIPTION
I
in
I
rom
Bushing seat bore in crankcase:
\
Class B 1.9882 to 1.9886
50.500 to 50.510
chain end
Class C 1.9886 to 1.9890
50.510 to 50.520
-
Class D 1.9961 to 1.9965 50.700 to 50.710
I
Class E 1.9965 to 1.9969 50.710 to 50.720
-
intermediate
.
. .
1.8278 to 1.8287
46.420 to 46.450
-
flywheel end
.
.
.
1.4142 to 1.4154
35.921 to 35.951
Free bushing 0.0.:
\
Class B 1.9876 to 1.9882 50.485 to 50.500
- chain end
Class C
1.9880 to 1.9886 50.495 to 50.510
I
Class D 1.9955 to 1.9961
50.685 to 50.700
Class E
1.9959 to 1.9965
50.695 to 50.710
- intermediate
1.8320 to 1.8335
46.533 to 46.571
- flywheel end
1.4185 to 1.4200 36.030 to 36.068
Bushing bore:
seated reamed
-
chain end 1.4970 to 1.4980(') 38.025 to 38.050(') 1.4970 to 1.4980 (')
38.025 to 38.050 (')
-
intennediate
1.6960 to 1.7000 43.078 to 43.180 1.7080 to 1.7088 43.884 to 43.404
-
flywheel end. 1.2070 to 1.2110
30.657 to 30.759
I. 2215 to 1.2223
31.026 to 31.046
Bushing
fit in
crankcase:
-
chain end, clearance
.0000 to .0010 0.000 to 0.025
- intennediate, press fit
.0033 to .0059 0.083 to 0.151
- flywheel end, press fit
.0031 to .0058 0.079 to 0.147
Camshaft journal diameter:
-
valve gear end
.
.
1.4951 to 1.4961
37.975 to 38.000
-
intermediate
. .
.
I. 7060 to I. 7070
43.333 to 43.358
-
flywheel end
. .
.
.
.
1.2195 to 1.2205 30.975 to 31.000
Bushing-to-journal fit:
\
chain end
.0010 to .0030 0.025 to 0.075
- clearance of new parts intermediate
.0010 to .0028 0.026 to 0.071
I
flywheel end
.
.0010 to .0028 0.026 to 0.071
(continued)
*)
This bushing, which comes precision finished, is secured by one screw.