The Isle of Man Steam Packet Company says the Ben-my-Chree is about to head off for its biennial checkup.
The vessel is due to head to Birkenhead from April 16 until May 5.
The company says a large capacity freighter has been chartered from Northlink Ferries, while the Manannan take over passenger and car services.
Chief Executive Mark Woodward says the dry-dock dates were confirmed in January this year and the replacement freighter will offer one return sailing each day from Heysham.
Work underway to 'get confidence back in the economy'
Chief minister says concern over finances based on 'more sentiment than actual evidence'
Energy and food security "two most important things", says MHK
Douglas North's John Wannenburgh believes these are the two main components that will determine the Island's survival
Gatwick drop-off fee rises again
Heads up for Manx air passengers travelling to London
Isle of Man inflation holds steady at 2.8 percent in November
Food, hospitality and education costs continue to rise, while falls in energy prices help offset pressures
