1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 220Get this manual
Install in vacuum testerPump out to 3-6 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 lubricant around suspected sealIf leak then stops or lubricant is drawn in, that seal is defectiveWhen the gearcase checks out properly, fill the gearcase with the proper lubricant28Fill the gearcase with 20-22 flo oz(600-650 ml) of lubricant as follows:
Secure the gearcase in an upright position Remove the oil level plug and the oil filldrain plugReplace the seals if damaged Fill gearcase with CIVIC Ultra-HPF gearcase lube until lubricant appears at the oil level holeInsert the oil level plug firstInstall the filldrain plugTighten the oil level and the filldrain plugs to 84-86 inIbs(9-10 Nm) Inspect the gearcase oil level after the engine test has been performed