We also owned a 1997 2166 until this past fall. We had around 2400 engine hours and 2000 rotor hours on it. We rebuilt the whole thing, just ran out of capacity. Never had trouble losing beans out the back, could open the sieves up but u may get a bunch of crap in the sample. We ended up replacing our 66 with a 2388, almost to big for us but the 2377 was a joke and we don't have enough help to run 2 combines.