PIAGGIO MP3 400 i.e., Service Manual, Page: 177 / 394

Specific tooling
020074Y Support base for checking crankshaft alignment
- If the crankshaft - crankcase axial clearance is higher than the standard value and the crankshaft
exhibits no irregularity, the problem is caused by wear or by a wrong machining on the engine crankcase.
- Check the diameters of both the bearings of the
crankshaft in accordance with the axes and surfa-
ces shown in the figure. Half-shafts are classified
into two categories, Cat. 1 and Cat. 2.
STANDARD DIAMETER
Specification Desc./Quantity
Cat. 1 40.010 ÷ 40.016
Cat. 2 40.016 ÷ 40.022
Inspecting the crankshaft alignment
- Install the crankshaft on the support and measure the displacement at the 4 points shown in the figure.
Specific tooling
020074Y Support base for checking crankshaft alignment
MAX ADMISSIBLE DISPLACEMENT:
Specification Desc./Quantity
A = 0.15 mm
B = 0.01 mm
C = 0.01 mm
D = 0.10 mm
- 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.
MP3 400 i.e.
Engine
ENG - 85