TM 1-1520-238-23
Change 8
4-274.3/(4-274.4 blank)
4.85A.
NO. 1 OR NO. 2 AFT ENGINE MOUNT SUPPORT BEARING REPLACEMENT (AVIM) – continued
a. Install new bearing (1) in mount (2) bore (3).
(1) Place bearing (1) in carbon dioxide. Use
carbon dioxide (item 40, App F) (dry ice).
(2) If necessary, heat mount (2). Use heater.
(3) Apply primer in bore (3). Use primer coating
(item 147, App F) and brush (item 34,
App F).
NOTE
Installation of bearing shall be accom-
plished using finger pressure only.
(4) Install frozen bearing (1) manually in bore (3)
while primer is still wet (TM 55-1500-322-24).
(5) Apply primer around bore (3) and bearing (1)
to form a fillet seal. Use primer coating
(item 147, App F) and brush (item 34,
App F).
(6) Allow bearing (1) and bore (3) to return to
room temperature.
(7) Apply finger pressure to verify bearing (1)
does not move.
(8) Ensure ball is free in outer race.
b. Ring Stake Bearing (1) in bore (3). Use staking
tool.
c. Inspect (QA).
d. Install No. 1 or No. 2 aft engine mount support
(para 4.85).
END OF TASK
MO4–5159–
3
2
3
1
