1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Repair Manual P/N 507661, Page 316Get this manual
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'DisassembIy of the Tilt Cylinder 1 Remove the end using PN 123196 PN 9120842 Drain the oil in the cylinder into
out of the tilt piston Remove the 8 Push the stem valve O-ring from inside