Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 434Get this manual
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SHIFT SPOOL ASSEMBLY (NON-RATCHETING)COMPONENT REASSEMBLY
Shift Spool Shaft Shift Spool Castle Nut Cotter Pin
6 Inspect to insure that the spool has no more than 0.002-0.010 (0.051-