An engineer on a sailing ship... did you blow the sails if the wind was gone? 
Haha, yeah, it's not exactly the most taxing job in the world, she does have 2 "main engines" and 2 generators (both are about the size of a lorry engine, but the whole point is that they try really hard not to use them apart from manoeuvring in and out of port (and they occasionally do even that without engines).
There is of course something to do every day even if it is repairing a leaky tap in the galley. The permanent engineer at the time when I used to sail on Royalist wasn't particularly great with electrics, so I used to spend quite a lot of my time on board looking at electrical faults. I also used to do a bit of sailing as well.