Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 374Get this manual
RIGHT HAND NON-RATCHETING
6Inspect sliding clutchCheck reverse gear and forward gear clutch jawsRounded jaws indicate one or more of the following: aImproper shift cable adjustmentbImproper shift habits of operator(s) (shift from NEUTRAL to REVERSE gear too slowly)cEngine idle speed too high (while shifting)
aClutch Jaws 7Check condition of cam followerIf it shows wear (pitting, scoring or rough surface), replace cam follower and shift cam
DISASSEMBLY
1Remove shift cam from cam follower2Insert thin blade screwdriver or awl under first coil of cross pin retainer spring and rotate propeller shaft to unwind spring from sliding clutchDO NOT over-stretch spring