1991 Johnson/Evinrude EI 60 thru 70 outboards Service Repair Manual P/N 507948, Page 215Get this manual

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Screw in vacuum testerPump out to 3-6 in (76-127 mm) of ecuy and see if vacuum holdsThen pump out to 15 in (381of ecuy and check If the gearcase fails to hold either test, put lubricant around suspect

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