1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 282Get this manual
o COA2423
COA2425
f131 9When servicing either cylinder, mount the bottom part of cylinder in soft-jaw viseIf equipped, remove the band nut and slide the band off the cylinder
1141 10Inspect the band nut O-ringReplace the O-ring if
necessary