WORKSHOP MANUAL - lombardini service

Disassembly / Reassembly
4
Shoulder half rings
So as to keep them in their seats during assembly, put a bit of
grease.
The half-rings must be assembled with the slots A as in the figure.
Thickness of half-rings is equal to 2.31÷2.36 mm.
They are supplied as spare parts as increased thickness 0.1 and 0.2
mm, see below.
112
Crankshaft axial clearance
After tightening the main bearings measure the axial clearance A
between the crankshaft flywheel side shoulder and the main bearing
half rings.
Ref.
Clearance
Limit value
A mm
0,130÷0,313
0, 5
B mm
23,05÷23,10
23,50
If the clearance is not within the given value check value B.
If need be, fit oversized half rings, see below.
113 114
Shoulder half rings, oversized elements
Dimensions (mm):
C B **
A*
Std
22,787÷22,920
23,050÷23,100
1 a 22,987÷23,120
23,250÷23,300
2 a 3,087÷23,220
23,350÷23,400
0,130÷0,313
3 a 23,187÷23,320
23,450÷23,500
115 116
* A of Fig. 113.
** B of Fig. 114.
Grinding B as per relevant table, you can mount the following half
rings:
1 st Oversized element Half rings 1 and 2 + 0.10 mm on both sides
of the bearing
2 nd Oversized element Half rings 1 and 2 + 0.10 mm on one side of
the support and + 0.20 mm on the other
side.
3 rd Oversized element Half rings 1 and 2 + 0.20 mm on both sides
of the bearing.
FOCS Workshop Manual_cod. 1.5302.858_1° ed_ rev. 00
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