2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 187Get this manual
LOWER UNIT TRANSMISSION GEAR ADJUSTMENT
TRANSMISSION GEAR ADJUSTMENT
If lower unit has been rebuilt or has had components replaced, then shimming for correct gear contact and backlash will have to be adjusted to ensure smooth, reliable operation of gearsAvailable thickness 0.7,0.8,0.9, 1.0, 1.1, 1.2, 1.3 0.7,0.8,0.9, 1.0, 1.1, 1.2, 1.3 1.5 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7,1 .8,1.9 0.7,0.8,0.9, 1.0,1 .1,1.2, 1.3 Design Specification thickness 1.0 Otrt-t-H.J
Numeric indexItem
Pinion gear back-up shim (mm) Forward gear back-up shim (mm) Forward gear thrust washer (mm) Reverse gear thrust washer (mm) Reverse gear back-up shim (mm)