SECTION 6 - GENERAL MECHANICAL OVERHAUL
27
CURSOR SERIES
Print P4D32C006 E Base - 03/2015
Main half -bearings thickness
Check the condition of the crankshaft main journals; there
must no be signs of scoring, ovalisation or excessive wear . The
values shown refer to rated pin diameter.
Measuring main journals
Figure 74
47535
Before grinding the pins using a micrometer (1), measure the
main journals and the crank pins (2) and decide, on the basis
of the undersizing of the half-bearings, the final diameter to
which the pins are to be ground.
NOTE It is advisable to enter readings in a table.
NOTE For a more accurate reading, take different mea-
surements on more than one point of the shaft
and calculate the average value.
Figure 75
224076
X = Main journals fitting detail N.Ëš 1-6
Figure 76
224078
X = Main journals fittings detail N.Ëš 7
During the adjustment operation, pay attention to the values
of the main journal coupling shown in figure
NOTE All main journals and crankpins must also be
ground to the same undersizing class, in order
to avoid any alteration to shaft balance.
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