Shibaura ST330, Workshop Manual

Page: 42 / 250

37
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.
(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.
125Y
1. Gauge
2. Piston pin
3. Torsion
4. Flat part of aligner
5.
5. Pin
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
Torsion and parallelism of connecting rod (mm)
Standard assembling
value
Repair value
Torsion (per 100 mm)
Less than 0.08 0.2
Parallelism
(per 100 mm)
Less than 0.05 0.15