Use a spudger to push on the vibration motor through the hole in the midframe at the top of the vibration motor housing.

Once the vibration motor has released from the adhesive in the housing, grab and remove it.

Use high-concentration (>90%) isopropyl alcohol and a coffee filter or lint-free cloth to remove the adhesive from the vibration motor housing.

Apply double-sided tape, like Tesa tape, to the housing in the same place as the old adhesive.

If your new vibration motor does not have a foam pad, transfer the pad from the old motor to the new one.