2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 256Get this manual
GEARCASE ASSEMBLY Lightly coat the threads of new pinion nut with outboard lubricant and install on the driveshaft using Pinion Nut Starting Tool, PIN 342216Turn the driveshaft by hand to engage the nutHand tighten pinion nut and remove the pinion nut starting tool
Propeller Shaft
Install the clutch dog on the propeller shaft with end marked PROP END to the rear, and shifter hole of the clutch dog and propeller shaft slot alignedUse Driveshaft Holding Socket, PIN 334995, and an 1116 inopen-end wrench to torque the pinion nut to 40 to 45 ftIbs(54 to 60 Nm)Pad handle of the wrench to prevent damage to gearcase