The rear bearing carrier, #53, should have a tab cast into it which aligns with a slot in the exhaust housing to prevent it from turning. The front thrust bearing, #45, will have either a hole or a slot (can’t remember) to line up with the pin, #34, which is pressed into the exhaust housing. If the thrust bearing has a dimple or two on it, it means someone was in there earlier and never got it lined up correctly with the pin before tightening the skeg down. Quite often when this happens, the locating pin will get driven in flush with the housing and will have to be drilled out and replaced.
