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If the driving shaft - crankcase axial clearance is higher than
the standard value and the driving shaft exhibits no irregula-
rity, the problem is caused by wear or by a wrong machining
on the engine crankcase
- Check the diameters of both half-shafts on the axes and
planes shown in the figure. Half-shafts are categorised as
categories 1 and 2; see table below.
Characteristic
Diameter standard - Categories 2
29,004 ÷ 29,010
Diameter standard - Categories 1
28,994 ÷ 29,000
The crankshaft may be reused when its width is within the
standard dimensions and the surfaces are not scored.
Version 250
- It is advisable to check the axial clearance of the driving
shaft before opening the engine cases. To do so, use a plate
and support with specific comparator.
- Upper clearances are a sign of wear on the resting surfaces
of the driving shaft and case.
- Remove the 10 case coupling screws.
- Divide the cases while keeping the driving shaft inserted on
one of the two half cases.
- Remove the driving shaft.
- Remove the half case coupling gasket.
- Remove the 2 screws and the internal bulkhead shown in
the figure.
- Remove the oil seal on the flywheel side.
- Remove the oil filter union shown in the figure.
131
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