Shibaura SG280E, Workshop Manual

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9. Crankshaft
1) Support the crankshaft on a stand and apply a dial
gauge to the crankshaft journal to measure
deflection. If the measurement exceeds the required
repair level, repair or replace the crankshaft.
2) Inspect the shaft diameter for damage and wear on
the journal and pin of the crankshaft. If
measurements exceed the usage limit or required
repair level, replace the crankshaft.
10. Timing gear and cam shaft assembly
1) Replace the gear if there is significant wear in the
teeth.
2) Measure the backlash in the gear. Replace the gear if
the measurement exceeds the usage limit.
Timing gear backlash (mm)
Assembly standard Usage limit
0.08 0.25 or more
Crankshaft deflection (mm)
Assembly standard Required repair level
0.02 or less 0.05 or more
Uneven wear limit of journal pin (mm)
0.05 or more
Crank journal shaft diameter ( φ )
External diameter
dimensions
Required repair
level
67.951 to 67.970 67.400 or less
Crank shaft pin shaft diameter ( φ )
External diameter
dimensions
Required repair
level
51.964 to 51.975 51.40 or less
Fig.2-5-28
Fig.2-5-29
Fig.2-5-30