Patent ID: 8578584

Claim:
A method for positioning outer and inner cases of a gas turbine engine relative to one another, the outer and inner cases having a plurality of radial spokes extending between them when the outer and inner cases are assembled, a bearing housing being attached to the inner case, the method comprising: a) positioning the inner and outer cases in a desired position; b) determining a variance between a present radial spoke length and a desired radial spoke length for each radial spoke based on the desired positioning of the inner and outer cases, wherein eccentricity is measured between the outer case and the bearing housing on a fixture assembly; c) abutting one end of each spoke against one of the inner and outer cases so that a radial gap exists between the other end of each radial spoke and the other of the inner and outer cases; d) modifying an effective length of at least some of the radial spokes according to the variance in order to meet the desired radial spoke length and closing each radial gap by inserting at least one spacer into the radial gap; and e) securing the radial spokes, spacers and the inner and outer cases together to provide an engine case assembly having the desired positioning of the inner and outer cases.