Jig for attaching and removing fastening bolt for carrier and lower arm of vehicle, and method for attaching and removing fastening bolt using jig

A method of attaching and removing a bolt using a jig, the bolt being inserted into a center hole of an inner cylinder included in a carrier bush and bolt holes opposed to each other to fasten a carrier and a lower arm, the inner cylinder being attached to the carrier via a rubber bush, the bolt holes being provided in tip portions of the lower arm that are located on both axial sides of the carrier bush, the method comprising:

• preparing the jig, the jig having:
• a base held in contact with a bottom surface of the lower arm;
• a fitting portion provided on the base and fitted into a fitting receiving portion of the lower arm to position the base with respect to the lower arm;
• and
• inner cylinder guides that stand on both side edges of the base and are penetrable into an inner tip portion of the lower arm, the inner cylinder guides having support grooves for supporting both ends of the inner cylinder, a center line of the inner cylinder coinciding with a center line of the bolt holes of the lower arm when the support grooves support the inner cylinder;
• after preparation of the jig, the method further comprises:
• attaching the jig by fitting the fitting portion of the jig into the fitting receiving portion of the lower arm;
• pushing up a back side of the base of the attached jig together with the lower arm with a jack;
• holding the outer surface of the inner cylinder by the support grooves of the inner cylinder guides;
• and
• attaching and removing the bolt while holding the inner cylinder by the support grooves.