2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 141Get this manual
POWER UNIT CYLINDERCRANKSHAFTPISTON
Crankshaft Main Bearing Oil Clearance
Measure: Crankshaft main bearing oil clearance
Plastigauge
Crankshaft main bearing oil clearance Standard: 0.0200.044 mm (0.00080.0017 in) Service limit: 0.060 mm (0.0024 in)
If exceed service limitReplace: Crankshaft andor Bearings