Diffuser case removal apparatus and method

A method of removing a centrifugal compressor diffuser case from a circumferential flange of a turbofan gas turbine engine case in which the diffuser case is mounted with an interference fit, the method comprising:

• removing at least one fastener connecting the diffuser case to the flange so that substantially only the interference fit joins the diffuser case to the flange;
• installing a plurality of tools around a periphery of the diffuser case;
• gripping a portion of the diffuser case with each of the tools;
• and then
• pushing axially against the flange in a concerted fashion with each of the tools with sufficient force to overcome the interference fit between the diffuser case and the flange and thereby axially move the diffuser case away from the flange.

A method of detaching a centrifugal compressor diffuser case from a turbofan gas turbine engine case in which the diffuser case is inserted with an interference fit, the method comprising:

• exposing the diffuser case while the gas turbine engine is attached to an aircraft, including removing through an aft portion of the engine case portions of the gas turbine engine located axially rearwardly of the diffuser case to thereby provide access to the diffuser case;
• removing at least one fastener connecting the diffuser case to the engine case so that substantially only the interference fit joins the diffuser case to the engine case;
• installing a plurality of tools around a periphery of the diffuser case;
• gripping a portion of the diffuser case with each of the tools;
• and then
• pushing axially against the engine case in a concerted fashion with each of the tools with sufficient force to overcome the interference fit between the diffuser case and the engine case and thereby axially move the diffuser case away from engine case.