2001 Mercury Mariner 50-60HP Factory Service Manual, Page 116Get this manual
CHARGINGSTARTING SYSTEM
2Remove dust cover by pulling it straight off3Remove the nut, washer, spring, pinion stopper and pinion drive assemblyYou may need to lightly clamp the armature in vise while removing the nut
NOTE: DISPOSE OF NUT AFTER REMOVING IT AND USE NEW ONE FOR REASSEMBLY58223