Defective plain bearing box

(3) Show signs of having been overheated, as evidenced by: melted babbitt, smoking

from hot oil, or journal surface damage.

(4) Have a broken back or lug.

(5) Are worn 1/4 inch or more lengthwise at either end.

(6) Have a combined wear lengthwise of 3/8 inch or more.

(7) Have a lug worn to depth of 1/8 inch or more in area which is over 50% of contact

face.

(8) Have combined wear, on both sides of lug extension is 1/4 inch or more at any

location.

(9) Have a lug worn through to brass at any location 3/8 inch or more above the lower

edge of brass side walls.

c. Defective plain bearing wedge. See Figure A- 3 for an illustration of a plain bearing

wedge. Plain bearing wedges are defective and shall be replaced if they:

(1) Are missing, cracked, broken, or bent.

(2) Are not located in their design positions.

(3) Overall length measured at contact surfaces is reduced more than 3/16 inch.

(4) Have bottom surfaces which are uneven to the extent of 1/64 inch as determined

by a straight edge.

(5) Are flat on top per the following table:

Nominal Journal Size

Wear Limit Flat Lengthwise

4 1/4 x 8 inches

3 1/4 inches

5 x9 inches

4 inches

5 1/2x 10 inches

4 1/2 inches

6 x11 inches

5 inches

6 1/2 x 12 inches

5 1/2 inches

d. Defective plain bearing box. Plain bearing boxes are defective and shall be repaired

or replaced as needed if they :

(1) Do not maintain free oil.

(2) Have a box lid that is missing, broken, or open except to receive servicing.

A-5