The Jets yesterday hired former Dolphins assistant coach Dan Quinn to be their defensive line coach, The Post has learned.

He replaces Denny Marcin, who had coached the defensive line for both Herman Edwards and Eric Mangini. Marcin is believed to be headed toward either retirement or reassignment. Quinn spent the last two seasons as the Dolphins’ defensive line coach under Nick Saban.

When Saban bolted for the University of Alabama job, Dolphins’ management asked Quinn to stay on staff as long as he signed a contract extension, but with no financial increase. Quinn said he’d rather finish out the final year of his existing deal and then talk extension and Dolphins’ new head coach Cam Cameron fired him.

The Jets signed Quinn, who was believed to be en route to New York yesterday, to a two-year deal, an NFL source said.