A tool for installing and removing a combustion liner (30, 350) inside a combustion casing (22, 310), the tool comprising: a mounting frame having at least one fastener (130, 140) suitable to be positioned at a distal end position (118, 120) among a plurality of distal end positions distributed circumferentially around an end casing surface of the combustion casing (22, 310), wherein the at least one fastener (130, 140) can removably attach the mounting frame to the combustion casing (22, 310); a positioning member; and an axial positioning mechanism engaging the mounting frame and the positioning member along a common axis, wherein the axial positioning mechanism incrementally positions the positioning member relative to the mounting frame by adjusting a positioning distance between the mounting frame and the positioning member, wherein said positioning member has a plurality of pushing surfaces (162, 172, 182) suitable to be distributed circumferentially around an end liner surface of the combustion liner (30, 350) and a plurality of pulling surfaces (168, 178, 188) suitable to be distributed circumferentially around an exterior liner surface of the combustion liner (30, 350); wherein the plurality of pushing surfaces (162, 172, 182) include liner facing surfaces (166, 176, 186) of a plurality of pushing pads (162, 172, 182) mounted to the positioning member at circumferentially distributed positions suitable to engage the end liner surface of the combustion liner (30, 350); wherein the mounting frame comprises a mounting bar with a first distal end position with a first through hole, wherein the at least one fastener (130, 140) include a first fastener (130, 140) through the first through hole into a first receiving hole in the combustion casing (22, 310); wherein the positioning member includes a central hub and at least three member arms extending from the central hub to support the plurality of pushing surfaces (162, 172, 182) and the plurality of pulling surfaces (168, 178, 188); wherein the plurality of pulling surfaces (168, 178, 188) are hook edges of a plurality of liner stop hooks mounted to the positioning member at circumferentially distributed positions around the exterior liner surface of the combustion liner (30, 350) suitable to engage a plurality of liner stop extending laterally from the combustion liner (30, 350): and wherein each arm comprises a pushing surface (162, 172, 182) and a pulling surface (168, 178, 188), wherein said pushing surface (162, 172, 182) is located radially inwards from said pulling surface (168, 178, 188) with regard to said common axis. a mounting frame having at least one fastener (130, 140) suitable to be positioned at a distal end position (118, 120) among a plurality of distal end positions distributed circumferentially around an end casing surface of the combustion casing (22, 310), wherein the at least one fastener (130, 140) can removably attach the mounting frame to the combustion casing (22, 310); a positioning member; and an axial positioning mechanism engaging the mounting frame and the positioning member along a common axis, wherein the axial positioning mechanism incrementally positions the positioning member relative to the mounting frame by adjusting a positioning distance between the mounting frame and the positioning member, wherein said positioning member has a plurality of pushing surfaces (162, 172, 182) suitable to be distributed circumferentially around an end liner surface of the combustion liner (30, 350) and a plurality of pulling surfaces (168, 178, 188) suitable to be distributed circumferentially around an exterior liner surface of the combustion liner (30, 350); wherein the plurality of pushing surfaces (162, 172, 182) include liner facing surfaces (166, 176, 186) of a plurality of pushing pads (162, 172, 182) mounted to the positioning member at circumferentially distributed positions suitable to engage the end liner surface of the combustion liner (30, 350); wherein the mounting frame comprises a mounting bar with a first distal end position with a first through hole, wherein the at least one fastener (130, 140) include a first fastener (130, 140) through the first through hole into a first receiving hole in the combustion casing (22, 310); wherein the positioning member includes a central hub and at least three member arms extending from the central hub to support the plurality of pushing surfaces (162, 172, 182) and the plurality of pulling surfaces (168, 178, 188); wherein the plurality of pulling surfaces (168, 178, 188) are hook edges of a plurality of liner stop hooks mounted to the positioning member at circumferentially distributed positions around the exterior liner surface of the combustion liner (30, 350) suitable to engage a plurality of liner stop extending laterally from the combustion liner (30, 350): and wherein each arm comprises a pushing surface (162, 172, 182) and a pulling surface (168, 178, 188), wherein said pushing surface (162, 172, 182) is located radially inwards from said pulling surface (168, 178, 188) with regard to said common axis.