1998 Johnson Evinrude "EC" 2 thru 8 Service Repair Manual, P/N 520202, Page 209Get this manual
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4 Pressure and vacuum test the gearcase as follows:
Remove the oil filldrain plug and screw in pressure test gauge Pump pressure up to 3-6 PSI (21-42 kPa)If pressure gauge indicates leakage, sub