Shibaura ST318, Workshop Manual

Page: 42 / 247

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5) Connecting rod
Inspection
(1) Check for torsion, parallelism and damage.
Measure the torsion and parallelism using a connecting
rod aligner and correct or replace if the repair value is
exceeded.
1. Gauge
2. Piston pin
3. Torsion
4. Flat part of aligner
5. Pin
(2) Measure the bore of the connecting rod small end bush
and replace if the clearance to the piston pin exceeds
the service limit.
(3) Install the connecting rod to the crankshaft, measure
the axial play and replace the connecting rod if the
service limit is exceeded.
Torsion and parallelism of connecting rod (mm)
Standard
assembling value
Repair value
Torsion (per 100 mm)
Less than 0.08 More than 0.2
Parallelism (per 100 mm) Less than 0.05 More than 0.15
T125
Clearance between bush and piston pin (mm)
Standard assembling value Service limit
0.008 – 0.023 More than 0.08
Axial play of connecting rod and crank pin (mm)
Standard assembling value Service limit
0.1 – 0.3 More than 0.7