1979 V4 Evinrude Outboard Service Repair Manual for V4 Engines P/N 506764, Page 140Get this manual
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2pressure to 3-6 psi (21-42 kPa) If pressure gauge indicates leakage, submerge gearcase in water to determine source of leakage as evidenced bubbIesIf gearcase pressure gauge does not indicate leakage