Compressor cover assembly method and forming tool

A method of assembling a compressor cover assembly (24) using a forming tool (40) in which the compressor cover assembly (24) includes a compressor cover (12) and a noise attenuation device (30), the method comprising

• inserting the noise attenuation device (30) into an air inlet (16) of the compressor cover (12);
• moving at least one of the compressor cover (12) and the forming tool (40) toward each other to an extent that the forming tool (40) applies a deforming compressive force to the air inlet (16);
• and
• while the forming tool (40) applies the deforming compressive force to the air inlet (16), rotating at least one of the forming tool (40) and the compressor cover (12) such that the forming tool (40) deforms the air inlet (16) along a path defined by the intersection of the forming tool (40) and the air inlet (16),
• wherein a deformation of the air inlet (16) resulting from the steps of moving and rotating serves to retain the noise attenuation device (30) in the air inlet (16).