A method for replacing a swirler (2) of a premixing or main burner of a burner arrangement (1), wherein the swirler (2) is connected to a distributor flange plate (5) of the burner arrangement (1) via a fuel gas feed pipe (3) and a fuel oil feed line (4) accommodated therein. The fuel gas feed line and the fuel oil feed line are severed to enable removal of the separated end portion of the fuel gas feed line. A sleeve is installed to replace the removed end portion.