2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 241Get this manual
GEARCASE SHIFT ROD ADJUSTMENT impeller, and slide water pump down over camBe sure impeller cam does not fall out of position
SHIFT ROD ADJUSTMENT
Check the shift rod height from the shift rod hole to the surface of the gearcase using Universal Shift Rod Height Gauge, PIN 389997
1-12Sharp edge Driveshaft rotation direction
IMPORTANT: Make sure the impeller engages the impeller cam properlySerious powerhead damage will result if impeller cam is displacedApply Gasket Sealing Compound to the threads of the four impeller screwsPosition the water tube bracketInstall the screws and tighten to torque of 60 to 84 in Ibs(7 to 9.5 Nm)