1997 Johnson Evinrude "EU" 90, 105RW, 115, 150, 150W, 175 60 LV Service Manual, P/N 507268, Page 233Get this manual
30 35Before installing lubricant, pressure test and vacuum test the gearcase as follows: Remove the oil level plug, and install in 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).lf pressure does not hold, submerge the gearcase in water and check for source of leakageMake necessary repairs and repeat test Install in vacuum testerPump out to 3-5 inches (76-127 mm) Hg and see if vacuum holdsThen, pump out to 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 lubricant [!!]
36Fill the gearcase with lubricant as follows: