The boiler of Whanganui River paddlesteamer Waimarie has been removed and refurbished for the first time in 21 years.
Work on it was part of the boat's out-of-water survey and inspection by Maritime New Zealand.
The last such survey was in 2016.
The boiler is now in excellent condition, Whanganui Riverboat Restoration & Navigation Trust chairwoman Marion Johnston said.
On Thursday a crane was used to lift the refurbished boiler high up over the boat and drop it in the place it will be reconnected.