2003+ Suzuki DF9.9/DF15 four stroke outboard motors service manual, Page 187Get this manual
8-22 LOWER UNIT
Checking and adjusting tooth contact pattern (Pinion and forward gear) 1To assess the tooth contact, apply light coat of Prussian Blue on the convex surface of the forward gear2Install the propeller shaft and the housing assembly (minus the reverse gear and the internal components)& Propeller shaft bearing housing bolt: Nm (0.8 kgf-m, 6.0 lb-ft) 3Push the propeller shaft inward and hold in the position4Rotate the driveshaft clockwise times by hand