2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 253Get this manual
GEARCASE DRIVESHAFT SHIMMING
DRIVESHAFT SHIMMING
IMPORTANT: If new pinion gear is needed, replace gear set before shimming procedurePinion gear backlash is achieved by using shims between the driveshaft bearing housing and the thrust washerWhen installing new thrust bearing or washer, bearing housing, pinion, or driveshaft, it is necessary to properly shim the assembly to restore factory clearanceUse Driveshaft Shimming Tool, PIN 393185, and Driveshaft Shim Kit, PIN 433032Shim gauge bars are precision made and should be handled carefullyThe length of each bar is stamped near the part numberThis dimension is 0.030 in(0.762 mm) shorter than the actual shimmed length of the driveshaft
Slide Collar, PIN 334985, from Driveshaft Shim Kit, PIN 433032, onto the driveshaft with large end in contact with the bearing housingInsert the assembled driveshaft into Tool Base, PIN 393185Tighten preload screw against the driveshaft until groove on the spring-loaded plunger is flush with end of threadsTighten locking ring on preload screw