2006 Johnson SD 30 HP 4 Stroke Outboards Service Repair Manual, PN 5006592, Page 221Get this manual
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GEARCASE SHIMMING AND GEAR BACKLASH CHECKS
Available thickness (mm)
1.7, 1.8, 1.9,2.0, 2.1, 2.2 0.8, 0.9, 1.0, 1.11.2, 1.3, 1.4, 1.5 2.0 1.6, 1.8, 2.0, 2.2, 2.4,2.6 0.2, 0.5, 0.8, 1.0