McInally helped the club gain promotion to the First Division
Jim McInally has resigned from his post as manager of Greenock Morton after three-and-a-half years at the club.
McInally guided to team back to the First Division last season, but despite a good start, the team now lies ninth in the table.
"Apart from poor results over the last 10 weeks or so, Jim has been good for our club," said chairman Douglas Rae.
"But he felt the only way the players would find favour again with the supporters was with a new manager."
The 44-year-old former Dundee United midfielder took over at Cappielow from John McCormack, with the club in the Second Division.
And last season he managed the Greenock outfit back to the First Division after a hiatus of six years.
Despite a promising start the team currently finds itself in the relegation play-off spot having lost six out of its last seven league matches.
McInally's assistant, Martin Clark, will also depart the club.
"Jim Mclnally has always given one hundred percent, win or lose," added Rae.
"Both Jim and Martin are very professional, honest, trustworthy and honourable men, and I am sure that our loss will prove to be another club's gain."