Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 457Get this manual
Propeller Shaft Assembly Component Reassembly
IMPORTANT: The appearance of the forward and reverse gear is almost identicalThere are two ways to distinguish between the reverse and forward gearsThe reverse gear has shorter hub and it has groove cut into the back of the gear just inside the thrust bearing race
3Assemble the shift spool assembly to the propeller shaft being sure to align the cross pin hole of the shift spool shaft with the clutch slot
FORWARD
-IFORWARD
50881 50885 Propeller Shaft Sliding Clutch Reverse Gear Shift Spool Assembly
199419951996 Models
aShorter HubGroove
4Assemble the cross pin through the sliding clutch, through the propeller shaft and through the shift spool shaft hole5Install detent pin in third hole in clutch