1998 Johnson Evinrude EC 5 thru 15 HP Four Stroke Service Manual, Page 264Get this manual
26Apply OMC Gasket Sealing Compound to the threads of the bearing housing screwsInstall the screws and tighten to 60-84 inIbs(7-9 Nm)[] 27Install the driveshaftRotate the driveshaft to allow the splines in the pinion to engage the splines on the driveshaft rn 28Pressure and vacuum test the gearcase as follows:
Pressure and vacuum test gearcase before filling Remove the oil level plug and install pressure test gauge Hold down firmly on the driveshaft and pump pressure up to 3-6 PSI (21-42 kPa)If pressure gauge indicates leakage, submerge the gearcase in water to determine source of leakage as evidenced by bubblesIf the gearcase pressure gauge does not indicate leakage, hold the driveshaft down and increase pressure to 16-18 PSI (110-124 kPa)If pressure does not hold, submerge the gearcase in water and check for source of leakageMake necessary repairs and repeat test Install vacuum testerPump out to 3-5 inches (76-127 Nm) Hg and see if vacuum holdsThen pump out to 15 inches (381 Nm) Hg and checkIf the gearcase fails to hold on either test, put oil around suspected sealIf leak then stops or oil is drawn in, that seal is defectiveWhen the gearcase checks out OK, refill with OMC Ultra-HPF gearcase lubricant