Big Ben, the iconic clock in London that has kept time for 157 years, withstood two world wars and become a symbol of the British capital, will fall silent for several months as part of a much-needed refurbishment program that is projected to last for three years, the British government said on Tuesday.

The problems facing Big Ben are profound: Maintenance teams have identified problems with the clock’s hands, mechanism and pendulum that threaten its ability to function properly, according to a Parliament statement. They also found leaks, erosion, severe rusting and cracked masonry in the tower itself, which does not meet fire safety guidelines.

The government also said an elevator would be installed to improve access in the tower and complement its 334 stone spiral steps.

The project will cost an estimated $42 million.

While Big Ben is used as a nickname for the clock, strictly speaking, it is the main bell inside the clock, and it also often refers to Elizabeth Tower, at the north end of the Houses of Parliament. The clock as a whole is called the Great Clock and sits atop the tower.