020262Y Crankcase splitting strip
020335Y Magnetic support for dial gauge
Characteristic
Axial crankshaft/crankcase clearance: Stand-
ard clearance
0.15 - 0.40 mm (when cold)
Axial connecting rod - crankshaft clearance
Standard clearance
0.20 ÷ 0.50 mm
Radial connecting rod - crankshaft clearance
Standard clearance
0.036 ÷ 0.054 mm
Width of crankshaft with integral washers:
standard measurements
55.67 ÷ 55.85 mm
Crankshaft bearings: Standard diameter: Cat.
1
28.994 ÷ 29.000
Crankshaft bearings: Standard diameter: Cat.
2
29.000 ÷ 29.006
Inspecting the crankshaft alignment
To install the drive shaft on the support and to
measure the misalignment in the 4 points indicated
in figure.
- Check that the driving shaft cone, the tab seat,
the oil seal capacity, the toothed gear and the
threaded tangs are in good working order.
- In case of failures, replace the crankshaft.
The connecting rod head bushings cannot be re-
placed. For the same reason, the connecting rod
may not be replaced and, when cleaning the
MP3 250 i.e. Engine
ENG - 51
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