How difficult is it to change a water pump on a Mercury?

Mrs. Mustang

New Member
I'm buying a motor, but it's been sitting for a year and the water pump needs to be replaced.

How difficult is this to do? I've never worked on a motor before.

The motor is a 40 hp Mercury (2 stroke) from 1997.

What other maintenance should be done?
The motor will not be on the boat when the work is done.
 
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