Two mechanics report a foreign carrier borrowed one of their B777-X model main gear tires; then later sent it to their foreign tire repair facility; and then accused the two mechanics of having including the wrong bearing with the tire.

Narrative

Maintenance installed a tire assembly on a B777. After removing the lone tire assembly; it was sent to Maintenance and Foreign Repair Station for unknown reasons. Instead of returning the tire assembly back to the originator; they made the tire assembly serviceable and attached an 8130. In their process; they found the inboard bearing part number not listed on the Component Maintenance Manual and accused carrier's tire shop mechanics of installing the wrong bearing. When the bearing and the tire assembly were returned to ZZZ; the Lead and another Mechanic verified that the bearing was indeed the correct bearing installed per carrier's documents. The Foreign Repair Station did not follow proper protocol and documentation. Callback conversation with Reporter ACN 818020 revealed the following information: Reporter stated the B777-X model tire was loaned to a foreign carrier from one of their domestic line maintenance stations. Under normal conditions; the foreign carrier should have just returned the borrowed tire. Somehow that tire ended up in a foreign repair station tire shop and overhauled. That foreign tire shop facility was not aware; nor did they have; the documents that allowed for two different wheel bearings with different part numbers to be used by Reporter's tire shop mechanics; as listed in their own Component Maintenance Manual (CMM). Reporter stated the 'B' model wheel assembly and bearings are much beefier in order to handle the heavier load carrying capacity of the B777-X. Reporter stated the 'X' model wheel bearings are bigger and heavier and will not fit inside the smaller bearing retainer area of the B777-Y model wheel half assembly.