"D.Smyth" wrote.
How tough is it to replace the alternator belt on my Merc I/O.

Mentioning what model Merc I/O you have might get you more meaningful
responses.

It looked simple but then I realized it was impossible to get ytuhen new
belt around the main pulley.

My 165 required that the front motor mount be partially removed to relpace
the belt.