Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 189Get this manual
6Replace bearing carrier bushing if bushing or area on propeller shaft that bushing contacts is pitted or wornPress bushing from carrier using Bushing Removal Tool (91-824787) Propeller Shaft
1Inspect cam follower for wearIf cam follower is worn, replace follower and inspect shift cam for serviceabilityReplace cam if worn