Any chance you’re fuel starved? I had a similar situation with my Lehman
80, pretty much the same numbers right after I bought the boat—clean bottom, shiny prop. I assumed the builder
intentionally overpropped her so she’d cruise
at max torque at around 1600. Surprisingly though, after a bunch of sorely needed engine maintenance
, including replacing all fuel filters, goo and all, and after running her for a few days, the next time I ran her up to WOT we had more like 2450.
Disclaimer, this is my first Diesel
engine and I am in no way claiming expertise, just sharing an anecdote.