WORKSHOP MANUAL - lombardini service

4
Disassembly / Reassembly
Central main bearing caps
The central support caps are marked with locations that can be
numbers as in the diagram or dots.
The same locations are given on the crankcase.
Couple the caps with the same references and on the same side. In
any case locate the bearing’s two centring notches that are to be
found on the same side.
Tighten the screws simultaneously at a torque of 60 Nm.
107
Rear and forward main bearing caps
Important
Before the final tightening and after it, using a ground bar,
check the coplanarity of the horizontal and vertical levels.
On remounting the rear main bearing cap 1 replace the lateral
rubber gaskets 2, keeping in mind that projections A and B of the
support must be 0,5÷1,0 mm; cut off any exceeding portions.
Do the same with the front bearing cap.
Before reintroducing the bearings in the crankcase, place between
their surfaces two plates C and D - 0.1 mm thick - se.no.7107-
1460-053.
108 109
Tighten the screws at a torque of 60 Nm.
Note: It is advisable to apply a few drops of silicon sealant on the
surface of the gasket slot 2.
Check the clearances between the bearings and the journal
Use the ”Perfect Circle Plastigage” type calibrated wire A and put it
at the centre of the bearing with a bit of grease.
Tighten the screws at a torque of 60 Nm.
Find out the clearance value checking the wire’s compression with
the appropriate graduated scale supplied in the same pack and
available on the market.
For clearance values between the journals, connecting rod pin
and the relevant bearings see page 51.
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