Nanni T4.155 seriers, Workshop Manual

Page: 169 / 191

60300140 (
indice A
) 4 CYLINDERS WORKSHOP MANUAL 169/191
j. Measure the widest part of the plastigage.
Lubrication clearance
Nominal: 0.036 – 0.054 mm
Dimension less than
0.25 and dimension
less than 0.50:
0.037 – 0.077 mm
Clearance limit: 0.10 mm
ADVICE: If the cylinder block sub-assembly is replaced,
the nominal clearance of the shell bearing will be as
follows:
0.036 – 0.054 mm
Replace crankshaft bearings if the lubrication clearance is greater than
the indicated limit. If necessary, grind or replace the crankshaft
.
ADVICE: When a standard shell bearing is used, replace it
with a shell bearing of the same number. If it is not
possible to determine the shell bearing number, choose an
appropriate one by adding the numbers stamped on the
connecting cylinder head and the crankshaft, then select a
shell bearing for which the number corresponds to the total
of these numbers. There are five nominal shell bearing
sizes, identified respectively by the numbers "2", "3", "4",
"5" and "6".
Numbered mark
Cylinder block 1 2 3
Crankshaft 1 2 3 1 2 3 1 2 3
Shell bearing
used
2 3 4 3 4 5 4 5 6
Example: Cylinder block "2" + crankshaft "1" = total number 3 (use
shell bearing "3")
Reference
Cylinder block bearing pivot bore diameter:
Mark "1"
75.000 – 75.006 mm
Mark "2" 75.006 – 75.012 mm
Mark "3" 75.012 – 75.018 mm
Crankshaft bearing pivot diameter:
Mark "1"
69.994 – 70.000 mm
Mark "2" 69988 – 69.994 mm
Mark "3" 69.982 – 69.988 mm