Check the radial clearance on the connecting rod.
Standard clearance: 0.036 ÷ 0.054 mm
-Check the surfaces that limit the axial free-play
are not scored and measure the width of the crank-
shaft between these surfaces, as shown in the
diagram.
Standard dimensions:
55.75 ÷ 55.90 mm
N.B.
WHEN MEASURING THE WIDTH OF THE CRANKSHAFT,
MAKE SURE THAT THE MEASUREMENTS ARE NOT
MODIFIED BY THE RADIUSES OF FITTINGS WITH THE
CRANKSHAFT BEARINGS.
If the axial clearance between crankshaft and crankcase exceeds the standard and the crankshaft does
not have any defect, the problem must be due to either excessive wear or wrong machining on the
engine crankcase.
Check the diameters of both bearings of the crank-
shaft according to the axes and surfaces shown in
the figure. The half-shafts are classified in two cat-
egories Cat. 1 and Cat. 2 as shown the chart
below.
Characteristic
Standard diameter - Category 2
29.004 ÷ 29.010
Standard diameter - Category 1
28.994 ÷ 29.000
The crankshaft can be reused when the width is within the standard values and the surfaces show no
signs of scoring.
X9 Evolution 125 Engine
ENG - 137
To Next Page
Loading...
