1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 233Get this manual
Driveshaft Shimming Using Tool PIN 315767 The driveshaft pinion is precisely meshed with the forward and reverse gears by the use of shim or shims between the driveshaft bearing housing and thrust washerWhen installing new thrust bearing or washer, bearing housing, pinion, or driveshaft, it is necessary to gauge and select the proper shims to restore factory clearance INote Degrease pinion and driveshaft tapers prior to assembly1Clean the driveshaft and pinion in clean solvent and dry thoroughlyAssemble the pinion to the driveshaft and tighten the pinion nut to torque of 40-45 ftIbs(54-60 Nm)2Place OMC Shim Gauge, PI 315767, in vise as shown
13613Select 0.020 in(0,508 1361 4
mm) of drives haft shimsClean the shims in solvent and dry thoroughlyCarefully measure shims using micrometerPosition the shims between the driveshaft and shim gauge as shownMeasure the clearance between the top of the shim gauge and the pinion using feeler gauge while pressing down on the driveshaft
5To obtain correct shim measurement, subtract the measurement obtained with the feeler gauge from the total measurement of shims between the drives haft and shim gaugeUse the amount of shims to give zero clearance