1988 Johnson Evinrude CC 60 thru 75 outboards Service Repair Manual P/N: 507662, Page 249Get this manual
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Istll vacuum testerPump out to 3-6 (76-127of see if vacuum holdsh pump out to 15 i(381of checkIf the gearcase fails to hold either test, put luit ud suspected seal If leak th stops luit is dwthat seal