Crankcase assembly: crankcase halves
file:///D|/Manuales/Para%20recolocar/MOTOS/DUCATI/DUCATI/M796/wsm/EN/M796_ABS_11_9_9B.79.1.html[11/12/2015 18:40:53]
designed for bearing combined loading (radial-axial loads).
Bearings of this type can bear thrust loads in one direction only. In fact, under the action of a radial load inside the
bearing, an axial force is created that must be counterbalanced by an axial force acting in the opposite direction; that is
why these bearings are generally fitted back to back in pairs.
To renew the bearings proceed as follows:
-heat the crankcase half in an oven to 100 °C;
-remove the bearing using a drift and hammer;
-install the new bearing (while the crankcase is still hot) keeping it perfectly square in its seat using a tubular drift that
only bears on the outer ring of the bearing;
-allow the parts to cool and check that the bearing is securely seated in the crankcase half.
Important
On badly worn engines, bearing outer rings may have developed clearance in the crankcase halves - normally, bearing
outer rings are interference-fit in the casing.
Check that the interference fit between the crankcase and the bearings (4) and (23) installed, is not less than 0.03 mm,
otherwise, replace the crankcase halves.
Important
After installing new main bearings, shim the crankshaft as described in the paragraph “Shimming the shafts” and
“
Reassembly of the crankcase halves “ of this section.
Reassembly of the crankcase halves
The crankcase halves must be in good condition and perfectly clean. The mating surfaces must be perfectly flat and free
from burrs.
Refitting the clutch-side crankcase half
The following parts must be present on the internal side of the crankcase half:
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