49 CFR 230.102: Tender plain bearing journal boxes.

Plain bearing journal boxes with the following defects shall be removed from service immediately and repaired:

(a) A box that does not contain visible free oil;

(b) A box lid that is missing, broken, or open except to receive servicing;

(c) A box containing foreign matter, such as dirt, sand, or coal dust that can reasonably be expected to damage the bearing; or have a detrimental effect on the lubrication of the journal and bearing;

(d) A lubricating pad that:

(1) Is missing;

(2) Is not in contact with the journal;

(3) Has a tear extending half the length or width of the pad, or more, except by design;

(4) Shows evidence of having been scorched, burned, or glazed;

(5) Contains decaying or deteriorated fabric that impairs proper lubrication of the pad;

(6) Has an exposed center core (except by design); or

(7) Has metal parts contacting the journal;

(e) A plain bearing that:

(1) Is missing, cracked, broken;

(2) Has a bearing liner loose;

(3) Has a broken out piece; or

(4) Has indications of having been overheated, as evidenced by:

(i) Melted babbitt:

(ii) Smoke from hot oil; or

(iii) Journal surface damage; or

(f) A plain bearing wedge that:

(1) Is missing, cracked or broken; or

(2) Is not located in its design position.