I've killed all scavengers (after installing turbopump), but nothing has happened. I've thoroughly searched the area but no enemies are present. The quest marker tell me to go into the ship, then stops. Ironsides just says- "This task of many years, hinges upon those turbopump bearings.

Also, I'm with Danse, if that affects anything.

P.S.- I dont have a save prior to the quest.

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Would be great if we had a developer console.

Thanks.

I have the same issue, lots of times I fast travel away and back and a random single raider will show up who I'll kill, but my task list still reads as "Defend the constitution" and I hear about the turbopump bearings. Also no past saves available.

It may that those infos helps you, a bit

http://fallout.wikia.com/wiki/Last_Voyage_of_the_U.S.S._Constitution

I've tried a little more last night, went to the turbo pump and tried 'activate' and it says it's already activated, and still everytime I fast travel to the constitution or to a landmark near it and walk to it, one or 2 raiders show up every time, I kill them everytime but nothing happens. It seems to me that my game state sees that there are still raiders somewhere (there aren't, until I fast travel away and back)

Unfortunately I don't see any information there as to any ways out of this loop.

sorry didn't see PS4
you can also get the bearings as random loot before the quest so you may be able to find them without the map marker.

He seems to have the same problem as myself, the bearings are already in place and taken care of, and activated, the raider sequence has started but never ends even when all the raiders are dead. It's not a matter of finding the bearings, it's just that the game for some reason doesn't seem to think one part of the mission is done.