3
51
A
ENGINE CHECKS AND ASSEMBLY
3.2 CONNECTING ROD AND
ENGINE SHAFT CHECK
3.2.1 Slew bearing removal and
refitting
If the main bearings need to be replaced, for the
250 ONLY, the main slew bearing on the left hand
motor semi-axle must also be replaced.
To do this, clamp the drive shaft of the semi-axle
on which the slew bearing to be replaced is in a
vice. Using an electric hotplate, heat special tool
A (code 026.14.018.00.00) to around 150°C and
put it on to the slew bearing straight away.
Hold the special tool tight to maintain good heat
transmission and pull out the slew bearing.
After checking the state of wear of the mating
surfaces, check the offset of the half shaft axes
(by measuring radial oscillation) by placing the
crankshaft between two tailstocks or similar
instrument. Check the maximum measurement
variation during a complete turn, using
comparators positioned on the mating surfaces
with the crankshaft bearings.
Allowed limit value: 0.02mm
Check the axial play between the connecting rod
head and the half shafts.
Recommended play:
0.39÷0.72mm
Remove the slew bearing from the right hand
semi-axle on the 250 version.
Deflection/Off-centring of crankshaft.
Connecting rod axial play.
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