Suzuki DR 125, Service Manual

Page: 71 / 222

ENGINE 3-35
CONROD DEFLECTION AND CONROD BIG END SIDE
CLEARANCE
Wear on the big end of the conrod can be estimated by checking
the movement of the small end of the rod. This method can also
check the extent of wear on the parts of the conrod’s big end.
$
Conrod deflection
Service Limit: 3.0 mm (0.12 in)
&
09900-20701: Magnetic stand
09900-20606: Dial gauge (1/100 mm)
09900-21304: V-block set (100 mm)
Push the big end of the conrod to one side and measure the
side clearance using a thickness gauge.
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Conrod big end side clearance
Service Limit: 1.0 mm (0.04 in)
&
09900-20803: Thickness gauge
If the clearance exceeds the service limit, replace crankshaft
assembly or bring the deflection and side clearance into specifi-
cation by replacing the worn parts. (e.g., conrod, big end bearing
and crank pin)
CRANKSHAFT RUNOUT
Support the crankshaft with V-blocks as shown. Position the dial
gauge, as shown, and rotate the crankshaft slowly to read the
runout. If the runout exceeds the service limit, correct the runout
or replace the crankshaft assembly.
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Crankshaft runout
Service Limit: 0.08 mm (0.003 in)
&
09900-20701: Magnetic stand
09900-20606: Dial gauge (1/100 mm)
09900-21304: V-block set (100 mm)
REASSEMBLY
• When rebuilding the crankshaft, the width between the webs
A
should be within the standard range.
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Crank web to web width
A
: 53.0 ± 0.1 mm
(2.09 ± 0.004 in)