1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 205Get this manual
31Before installing lubricant, pressure test and vacuum test the gearcase as follows: Remove the oil level plug, and install pressure test gauge Pump up pressure 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, 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 mm) Hg and see if vacuum holdsThen, pump outto 15 inches (381 mm) 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 OK, refill with the proper lubricant32Fill the gearcase with lubricant as follows: Secure the gearcase in an upright position Remove the oil level plug and the drainfill plug Replace their seals, if damaged Fill the gearcase with OMC Ultra-HPFgearcase lube until it appears at the oil level holeInstall the oil level plug, then the drainfill plugTighten them to torque of 84-86 inIbs(9-10 Nm) Check the oil level after the motor has been run